A self-propelled welding machine

Abstract

A self-propelled welding machine comprising a front and a rear defined by a principal direction of travel, the welding machine comprising: a ground engaging propulsion structure, for example a pair of endless tracks; a chassis mounted to the ground engaging structure; a prime mover mounted to the chassis and operable to provide motive power to the ground engaging structure; an electric arc welding unit configured to perform a welding operation on a component remote from the welding machine; and a power source to provide electrical power to the welding unit.

Description

[0001] A Self-Propelled Welding Machine

[0002] FIELD

[0003] The present teachings relate to a self-propelled welding machine.

[0004] BACKGROUND

[0005] Welding is a fundamental process in many industries for joining components in non- releasable way. If those components are large, the welding may need to take place on-site away from mains electrical power. Transportable electric arc welding units for joining metal components are typically used in various welding operations across a range of industries, for example rail, construction, oil and gas, agriculture, military and defence, infrastructure and / or emergency repairs. Typically, such welding units include a petrol or diesel engine mated to an alternator and welder. They are transported manually on wheeled trolleys, or towed / carried by other powered vehicles, as they are heavy and cumbersome, even at relatively low power outputs.

[0006] It is common that the electric arc welding unit is transported long distances, sometimes over uneven and irregular terrain, as access to sites by road vehicles can be restricted. The units may also need to be loaded and unloaded from trucks, vans and trailers, so even if they are manageable on the ground they may present manual handling challenges when being delivered to or collected from a site access location. There is therefore a problem with the units reaching the welding site in a safe and timely manner.

[0007] Units with a greater power output are inevitably heavier, because a larger engine, alternator and welder are required. As a result, it is common that due to the required output from the machine for certain jobs, two machines have to be used in series to achieve the power output, as they would otherwise be too heavy for manual handling. On top of this, auxiliary power is often required, for powering other tools or lighting, for example. On known machines, however, the auxiliary power cannot be used at the same time as the welding unit, again to reduce the weight of the unit. Due to the number of additional components required to perform the welding operation, it is common that equipment has to be carried manually or towed. Due to the weight of the equipment involved and irregular terrains, this also poses serious health and safety concerns. Maintenance of rail tracks represents an example of these problems, since welding units may be needed far from roads and mains power, and access along a trackbed is typically narrow and uneven. Further, maintenance often occurs overnight to avoid disruption to rail services and to ensure the safety of the operatives carrying out such maintenance.

[0008] The present teachings seek to overcome or at least mitigate one or more problems associated with the prior art.

[0009] SUMMARY

[0010] A first aspect of the teachings provides a self-propelled welding machine comprising a front and a rear defined by a principal direction of travel, the welding machine comprising: a ground engaging propulsion structure, for example a pair of endless tracks; a chassis mounted to the ground engaging structure; a prime mover mounted to the chassis and operable to provide motive power to the ground engaging structure; an electric arc welding unit configured to perform a welding operation on a component remote from the welding machine; and a power source to provide electrical power to the welding unit.

[0011] Advantageously, this arrangement provides a welding machine which can access remote locations to perform a welding operation without the need for a separate means of transportation to the welding location, for example by towing or manual handling. This is particularly advantageous in the rail industry, where locations for welding can be remote from normal vehicular access and can involve uneven terrain.

[0012] The machine power source may be the prime mover and the self-propelled welding machine may comprise an alternator, and the prime mover may be configured to drive the alternator to provide electrical power to the welding unit.

[0013] Advantageously, alternators are an efficient component for converting mechanical energy, for example from a prime mover, into electrical energy. Additionally, alternators produce a higher electrical output compared, for example, to traditional generators. The welding unit may be in line with the prime mover. The alternator may be in line with the prime mover.

[0014] Advantageously, this arrangement helps to improve the weight distribution of the self-propelled welding machine.

[0015] An axis of an output shaft of the prime mover may extend substantially parallel to a central longitudinal axis of the self-propelled welding machine.

[0016] Advantageously, the arrangement of the prime mover minimises the required width of the chassis, which increases the self-propelled welding machine's ability to access remote locations to perform a welding operation. Additionally, the arrangement of the prime mover may improve the weight distribution of the self-propelled welding machine.

[0017] The prime mover may be at least partially interposed between the pair of endless tracks. A majority of the prime mover is interposed between the pair of endless tracks.

[0018] Advantageously, the arrangement of the prime mover minimises the required width of the chassis, which increases the self-propelled welding machine's ability to access remote locations to perform a welding operation. Additionally, the location of the prime mover between the tracks may improve the weight distribution of the self- propelled welding machine, thereby improving its ability to traverse uneven terrain safely.

[0019] The self-propelled welding may comprise a hydraulic system supported on the chassis and configured to provide motive power from the prime mover to the ground engaging structure. The hydraulic system may comprise a hydraulic pump and a hydraulic motor.

[0020] Advantageously, hydraulic systems are robust and able to withstand external environmental conditions, such as rainwater and debris. Additionally, the hydraulic system provides direct drive to the ground engaging structure from the prime mover without the need for a complex mechanical drive arrangement.

[0021] The hydraulic system may be located towards the front of the self-propelled welding machine. Advantageously, the arrangement of the hydraulic system minimises the length of hydraulic passages between the pump and the motor and the required width of the chassis, which increases the self-propelled welding machine's ability to access remote locations to perform a welding operation. Additionally, the location of the hydraulic system improves the weight distribution of the self-propelled welding machine.

[0022] The hydraulic system may further comprise a hydraulic fluid reservoir, and the hydraulic fluid reservoir may be located above the hydraulic pump.

[0023] Advantageously, the arrangement of the hydraulic pump and the hydraulic fluid reservoir helps to reduce the length and width of the chassis, while using a gravity infeed to supply hydraulic fluid to the hydraulic fluid pump.

[0024] The hydraulic system may comprise a valve block, and the at least one hydraulic motor may comprise first and second hydraulic motors configured to drive each of the pair of endless tracks, and the valve block may be configured to control the flow of hydraulic fluid to the first and second hydraulic motors in order to control steering and / or drive direction of the pair of endless tracks.

[0025] Advantageously, the valve block enables precise control of hydraulic fluid flow to the hydraulic fluid motors, whilst being space efficient. Additionally, providing two hydraulic motors enables control of steering and / or drive direction which the need for a complex mechanical arrangement as steering is affected by differential drive to the motors.

[0026] The prime mover may be located between the hydraulic pump and the alternator, and the prime mover may comprise a first output configured to drive the hydraulic pump and a second output configured to drive the alternator.

[0027] Advantageously, a prime mover with two outputs can provide more power than a prime mover with a single output because the power from the engine can be split between two different devices. Using a single prime mover to power the hydraulic pump and the welding alternator decreases the overall size and weight of the prime mover, thereby increasing the compactness of the self-propelled welding machine.

[0028] The welding machine may be configured to be in communication with a remote control device, and the remote control device may be operable to control movement of the self-propelled welding machine. The remote control device may be wireless or the remote control device may be tethered to the self-propelled welding machine.

[0029] Advantageously, the remote control of the self-propelled welding machine means that the operator can be a safe distance from the self-propelled welding machine during operation, and the welding unit does not require a cab or operator station to support and protect the operator.

[0030] The self-propelled welding machine may comprise a fuel or electrical energy storage device located below the prime mover and configured to supply fuel or electricity to the prime mover. The fuel or electrical energy storage device may extend along a majority of the chassis.

[0031] Advantageously, the location of the fuel or electrical energy storage device on the chassis lowers the centre of gravity of the self-propelled welding machine, thereby increasing the overall stability. Additionally, the fuel storage device requires a lower degree of maintenance, and therefore accessibility, compared to other components of the self-propelled welding machine, e.g. the prime mover.

[0032] The fuel or electrical energy storage device may terminate before the front of the self-propelled welding machine to define a space therebetween, and the hydraulic system may extend through the space to supply hydraulic fluid to the ground engaging structure.

[0033] Advantageously, the arrangement of the fuel storage device and the hydraulic system provides the required space through which the hydraulic system extends, thereby decreasing the complexity of the hydraulic system pipework and increasing the overall compactness of the self-propelled welding machine.

[0034] The fuel or electrical energy storage device may be located between the prime mover and the ground engaging structure.

[0035] Advantageously, the location of the fuel or electrical energy storage device on the chassis lowers the centre of gravity of the self-propelled welding machine, thereby increasing the overall stability. Additionally, the fuel storage device requires a lower degree of maintenance, and therefore accessibility, compared to other components of the self-propelled welding machine, e.g. the prime mover.

[0036] The self-propelled welding machine may comprise a back-up power source configured to supply drive to the ground engaging propulsion structure when a fault condition of the prime mover is determined. The back-up power source may be a battery.

[0037] Advantageously, this enables the ground engaging structure to move the self- propelled welding machine to move to a safe location in an emergency condition. For example, if the machine is operating proximate to rail tracks it enables the machine to move away from the tracks if a train approaches, even if the prime mover is inoperable.

[0038] The welding unit may comprise an electrode oven supported on the chassis, and the electrode oven may be configured to supply heat energy to at least one welding electrode.

[0039] Advantageously, the electrode oven helps to keep the electrodes warm and dry, thereby increasing the efficiency of the welding unit.

[0040] The self-propelled welding machine may comprise at least one electric power-take off point powered by the machine power source and configured to supply power to auxiliary components of the self-propelled welding machine.

[0041] Advantageously, the alternator of the welding unit can be used to provide electrical power to auxiliary components of the self-propelled welding machine, for example lighting or power tools, at the same time the welding unit is performing a welding operation.

[0042] The self-propelled welding machine may comprise an indicator configured to indicate an operational state of the self-propelled welding machine. The indicator may be configured to indicate at least one of: motion of the self-propelled welding machine, an active state of the self-propelled welding machine and / or a fault state of the self-propelled welding machine.

[0043] Advantageously, the indicator increases the safety of the self-propelled welding machine by indicating the operational state of the self-propelled welding machine and alerting nearby persons to the operational state of the self-propelled welding machine.

[0044] The self-propelled welding machine may comprise a lighting tower configured to illuminate a work area. The lighting tower may be moveable between a deployed position and a stowed position, and a total height of the self-propelled welding machine may be reduced in the stowed position compared to the deployed position. Advantageously, the lighting tower improves safety of the self-propelled welding machine.

[0045] The power output of the prime mover may be up to 24kW, for example up to 14kW.

[0046] The welding unit may be configured to deliver up to 600 amps of current, for example up to 350 amps of current.

[0047] The self-propelled welding machine may define a mass up to 2700kg, for example up to 750kg, optionally up to 500kg.

[0048] The self-propelled welding machine may comprise a control panel located on the body of the self-propelled welding machine and configured to control at least one machine parameter. The machine parameter may be a parameter of the prime mover.

[0049] Advantageously, the control panel is easily accessible by the operator, and enables the operator to control machine parameters and on / off functions of the self- propelled welding machine.

[0050] The self-propelled welding machine may comprise a roll cage mounted to the chassis, and wherein the prime mover and the welding unit are located within the roll cage.

[0051] Advantageously, the roll cage improves the safety of the self-propelled welding machine and helps to reduce damage to components of the self-propelled welding machine.

[0052] The self-propelled welding machine may further comprise at least one storage tray removably mounted to the body of the self-propelled welding machine.

[0053] Advantageously, the storage tray provides a location to store tools and / or cabling. This improves tidiness of the self-propelled welding machine, and reduces the level of manual handing required by the operator to transport heavy or bulky equipment.

[0054] The self-propelled welding machine may define a length extending along the longitudinal axis of the self-propelled welding machine. The length may be up to 1500mm. The self-propelled welding machine may define a width extending along an axis perpendicular to the longitudinal axis of the self-propelled welding machine. The width may be up to 850mm. The self-propelled welding machine may define a height extending along an axis perpendicular to the longitudinal axis of the self- propelled welding machine. The height may be up to 1000mm.

[0055] Advantageously, dimensions up to these ranges provide a compact self-propelled welding machine which can access remote locations to perform a welding operation without the need for transportation, for example towing. This is particularly advantageous in the rail industry, where locations for welding can be remote and involve irregular terrains. Additionally, at self-propelled welding machine having dimensions in these ranges can be more easily transported long distances between locations for deployment, for example on a lorry or by a tow vehicle.

[0056] The self-propelled welding machine may comprise an inclinometer configured to measure an inclination of the self-propelled welding machine in at least one direction, and wherein the self-propelled welding machine is configured to stop or prevent the supply of tractive power to the ground engaging structure when the inclination of the self-propelled welding machine exceeds a predetermined threshold.

[0057] Advantageously, the inclinometer increases the safety of the self-propelled welding machine by preventing the self-propelled welding machine from moving when the inclination of the self-propelled welding machine exceeds a safe threshold. This may be particularly advantageous in the rail industry, where terrain is typically irregular.

[0058] The inclinometer may be configured to measure the lateral inclination of the self- propelled welding machine about a central longitudinal axis of the self-propelled welding machine, and / or the inclinometer may be configured to measure the back- forth inclination of the self-propelled welding machine about an axis perpendicular to the central longitudinal axis of the self-propelled welding machine.

[0059] Advantageously, measuring the lateral and back-forth inclination of the self- propelled welding machine helps to account for both irregular and uphill terrain.

[0060] The self-propelled welding machine may comprise at least one attachment location configured to attach a lifting device. The attachment location may be located on an uppermost surface of the self-propelled welding machine.

[0061] Advantageously, the attachment location facilitates lifting and transportation of the self-propelled welding machine, thereby increasing the ease of transportation of the self-propelled welding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Embodiments will now be described with reference to the accompanying drawings, in which:

[0063] Figure 1 is an isometric view of a self-propelled welding machine according to the present teachings;

[0064] Figure 2 is a front view of the self-propelled welding machine of Figure 1;

[0065] Figure 3 is a side view of the self-propelled welding machine of Figure 1; and

[0066] Figure 4 is side partial cross-section on a vertical plane through x-x of Figure 2, not including the roll cage and certain other components;

[0067] Figure 5 is a schematic view of the self-propelled welding machine of Figure 1; and

[0068] Figure 6 is a schematic view of an alternative embodiment of a self-propelled welding machine according to the present teachings.

[0069] DETAILED DESCRIPTION OF EMBODIMENT(S)

[0070] Referring firstly to Figures 1 to 5, there is shown a self-propelled welding machine 10. The self-propelled welding machine 10 includes a front 10a and a rear side 10b defined by a principal direction of travel. The self-propelled welding machine 10 also includes a first side 10c and a second side lOd located on the left and right of the self-propelled welding machine 10. The first side 10c and the second side lOd are located on either side of a longitudinal axis a-a of the self-propelled welding machine 10.

[0071] The self-propelled welding machine 10 includes a ground engaging structure 12a, 12b, a chassis 14, a prime mover 16, an electric arc welding unit 18 and a power source 17, for example a machine power source 17. In some embodiments, the self-propelled welding machine 10 may include any one, or any combination of, an alternator 19, a hydraulic system 20, a fuel storage device 22, a back-up power source 24, a lighting tower 26, an inclinometer, a control panel 30, a roll cage 32, at least one storage device 34a, 34b, at least one attachment location 36 and / or an indicator 37. In the embodiment of Figures 1 to 5, the self-propelled welding machine 10 is a compact self-propelled welding machine 10, having a mass of up to 2700kg, for example up to 700kg. In some embodiments, the welding machine 10 has a mass up to 500kg. The self-propelled welding machine 10 defines a length extending along the longitudinal axis a-a of the self-propelled welding machine 10. The length may be up to 2000mm, for example up to 1500mm. The self-propelled welding machine 10 defines a width extending along an axis perpendicular to the longitudinal axis a-a of the self-propelled welding machine 10. The width may be up to 1200mm, for example up to 850mm. The self-propelled welding machine 10 defines a height extending along an axis perpendicular to the longitudinal axis a-a of the self-propelled welding machine 10. The height may be up to 1300mm, for example up to 1000mm. Advantageously, heights, widths, lengths and weights within these ranges, particularly in the lower of the ranges, provide a compact self- propelled welding machine 10 which can access remote locations to perform a welding operation. In addition these dimensions and masses enable the machine 10 to be transported on a trailer towed by a light commercial vehicle with a combined weight of trailer and machine of up to 3500kg. This is advantageous as this allows transport on the public road by anyone who has passed a standard car driving test. In some instances, the machine may be compact and light enough to be carried on the bed itself of a van or pick-up type light commercial vehicle that may be driven with a standard car licence.

[0072] In some embodiments, the welding machine 10 may have a greater size than the welding machine 10 shown in the Figures. In such embodiments, the length may be up to 3000mm, for example up to 2000mm. The width may be up to 2000mm, for example up to 1500mm. The height may be up to 2000mm, for example up to 1500mm.

[0073] As illustrated in Figure 1, the ground engaging structure 12a, 12b is provided in the form of a pair of endless tracks 12a, 12b. Each of the pair of endless tracks 12a, 12b are provided on opposing sides of the longitudinal axis a-a, i.e. on each of the first and second side 10c, lOd of the self-propelled welding machine 10. The pair of endless tracks 12a, 12b are particularly useful because they provide improved weight distribution, lower ground pressure, and thus the ability to move along irregular, rough and / or wet surfaces. The pair of endless tracks 12a, 12b therefore increase the applicability of the self-propelled welding machine 10 to use in remote, restricted locations, such as trackside rail applications. The tracks 12a, 12b each include at least one roller 38a-c configured to be driven by at least one hydraulic motor 40a, 40b of the hydraulic system 20 via a track link, as is known in the art. It shall be appreciated that in alternative embodiments, any suitable arrangement of track 12a, 12b may be provided. The at least one hydraulic motor 40a, 40b provides motive power from the prime mover 16 to rotate the track link, which in turn rotates the rollers 38a-c to provide rotation and support to each of the pair of tracks 12a, 12b. In the embodiment of Figure 1, a first hydraulic motor 40a is configured to drive the first of the pair of endless tracks 12a, and a second hydraulic motor 40b is provided to drive the second of the pair of endless tracks 12b. The first and second hydraulic motors 40a, 40b are illustrated in Figure 5.

[0074] In alternative embodiments, the ground engaging structure 12a, 12b may include a plurality of wheels (not shown) arranged in pairs on the first and second sides 10c, lOd of the self-propelled welding machine 10. By way of example, the self- propelled welding machine 10 may include four pairs of wheels.

[0075] The chassis 14 is mounted to the ground engaging structure 12a, 12b. The chassis 14 includes a chassis frame 15 configured to provide support for the ground engaging structure 12a, 12b. The chassis frame 15 is configured to fixedly mount the pair of endless tracks 12a, 12b relative to one another, and therefore extends between the pair of endless tracks 12a, 12b. It shall be appreciated that any suitable mounting arrangement (not shown) may be used to mount the pair of endless tracks 12a, 12b to the chassis frame 15, for example a plurality of bolts. The structural strength of the chassis 14 is provided by the chassis frame 15, which includes first and second angle rail sections 15a, 15b extending parallel to the central longitudinal axis a-a and located on the first and second sides 10c, lOd of the self-propelled welding machine 10, i.e. spaced apart from the central longitudinal axis a-a.

[0076] The chassis frame 15 also includes a base 15c, for example provided as a tray 15c, illustrated in Figure 1, extending between the first and second sections 15a, 15b. As illustrated in Figure 3, the base 15c extends between the front 10a and rear 10b of the welding machine 10, and extends beyond the ground engaging structure 12a, 12b in both the frontward and rearward direction. The base 15c is configured to support the fuel storage device 22. The prime mover 16, the alternator 19 and the welding unit 18 are mounted to the base 15c. In some embodiments, the base 15c may be foldable. This helps to improve ease of assembly and transportation of the chassis frame 15. In alternative embodiments, the chassis frame 15 may be any suitable shape.

[0077] The chassis frame 15 has a ground clearance up to 500mm, for example up to 300mm, optionally up to 270mm. This helps the self-propelled welding machine 10 to move along irregular and difficult terrain, such as steep gradients and climbing limited access staircases.

[0078] The prime mover 16, the hydraulic system 20, the electric arc welding unit 18 and the roll cage 32 may be provided with the first and second angle rail sections 15a, 15b and the base 15c as a subassembly. The subassembly may be assembled separately from the ground engaging structure 12a, 12b and the mounting arrangement for mounted the pair of endless tracks together chassis 14, lifted onto the ground engaging structure 12a, 12b and mounted into place using any suitable mounting arrangement, for example bolts. The fuel storage device 22 is then slid in underneath the prime mover 16 and the welding unit 18 to form the self- propelled welding machine 10.

[0079] The roll cage 32 is mounted to the chassis frame 15. The roll cage 32 is intended to protect components of the self-propelled welding machine 10 from damage caused by the self-propelled welding machine 10 overturning or rolling over. In order to increase the compactness of the welding machine 10, the welding machine 10 does not include an operator station in this embodiment. The prime mover 16, the electric arc welding unit 18 and the hydraulic system 20 are located within the roll cage 32. Additionally, the roll cage 32 is configured to provide impact protection from foreign objects to these components. This is particularly advantageous for applications wherein the self-propelled welding machine 10 moves over irregular terrains, such as rail applications.

[0080] The roll cage 32 includes a roof 33 configured to extend over the prime mover 16 and the electric arc welding unit 18. In some embodiments, the roll cage 32 may include an enclosed canopy, and the canopy may be acoustically lined, for example using a foam lining. This may be particularly advantageous when the self-propelled welding machine 10 is used in populated areas, such as cities or towns.

[0081] The fuel storage device 22, illustrated in Figure 1, is configured to store fuel for use by the prime mover 16, for example gasoline or diesel. In this embodiment, the fuel storage device 22 may be configured to store up to 35 litres of fuel, for example up to 25 litres of fuel. Volumes up to these ranges have been found to be suitable to run the prime mover 16 for up to 8 hours for the particular type used - i.e. a normal working shift. The fuel storage device 22 may be a tank or an alternative vessel suitable for the storage of fuel. The fuel storage device 22 is located below the prime mover 16 and configured to supply fuel to the prime mover 16, for example via fuel lines. The fuel storage device 22 is supported on the chassis 14. The fuel storage device 22 is located between the first and second sections 15a, 15b of the chassis frame 15. This helps to provide a space efficient arrangement, because the fuel storage device 22 is located in the space defined between the first and second sections 15a, 15b.

[0082] In the embodiment of Figures 1 to 5, the fuel storage device 22 extends along a majority of the chassis 14. The fuel storage device 22 is located between the prime mover 16 and the ground engaging structure 12a, 12b. The fuel storage device 22 extends between the first and second set of endless tracks 12a, 12b. The location of the fuel storage device 22 below the prime mover 16 lowers the centre of gravity of the welding machine 10, thereby increasing the overall stability of the welding machine 10. Additionally, the fuel storage device 22 requires a lower degree of maintenance, and therefore accessibility, compared to other components of the welding machine 10, e.g. the prime mover 16 and the hydraulic system 20.

[0083] The fuel storage device 22 is substantially rectangular. It shall be appreciated that in alternative embodiments, any suitable shape of fuel storage device 22 may be used. The fuel storage device 22 includes a substantially planar uppermost surface, illustrated in Figure 2. This helps to enable components of the welding machine 10, such as the prime mover 16 and / or the electric arc welding unit 18, to sit upon the fuel storage device 22 when the self-propelled welding machine 10 is assembled.

[0084] The fuel storage device 22 terminates before the front 10a of the welding machine 10 to define a space therebetween, as illustrated in Figure 1. The hydraulic system 20 extends through the space to supply hydraulic fluid to the ground engaging structure 12a, 12b. This helps to simplify the arrangement of the hydraulic system 20, and increases the compactness of the self-propelled welding machine 10.

[0085] The prime mover 16 is illustrated in Figure 4. The prime mover 16 is mounted to the chassis 14 and operable to provide motive power to the ground engaging structure 12a, 12b. In the embodiment of Figures 1 to 5, the prime mover 16 is an internal combustion engine 16 configured to run on petrol. In alternative embodiments, the internal combustion engine 16 may be configured to run on diesel. The prime mover may have a power output up to 24kW, for example up to 14 kW. In the embodiment of Figures 1 to 5, the power output is up to 14 kW, for example 13.5 kW. In some alternative embodiments, the power output of the prime mover may be up to 75kW, for example up to 50kW, for example up to 35kW.

[0086] The prime move 16 includes a cooling system (not shown), for example an air or water cooling system, configured to cool the prime mover 16. In embodiments wherein the prime mover 16 runs on petrol, an air cooling system may be used. This helps to improve the compactness of the self-propelled welding machine 10, because air cooling system are less bulky than water cooling systems. In alternative embodiments, the prime mover 16 may be a gas engine configured to run on a gaseous fuel such as hydrogen or compressed natural gas, amongst others. Alternatively, the prime mover 16 may be an electric motor, or may be a hybrid comprising both an internal combustion engine and an electric motor, as will be described in more detail below.

[0087] The prime mover 16 includes a crankshaft, a first output 16a and a second output 16b. In the embodiment illustrated in Figure 4, the prime mover 16 is located closer to the front 10a of the welding machine 10 than the rear 10b of the welding machine 10.

[0088] A longitudinal axis of the first and / or second output 16a, 16b of the prime mover 16 extends substantially parallel to the central longitudinal axis a-a of the self- propelled welding machine 10 (i.e. in a direction running from the rear 10b to the front 10a of the welding machine 10). The prime mover 16 is arranged substantially upright. The prime mover 16 includes a plurality of reciprocating pistons, and the pistons reciprocate about an axis substantially perpendicular to the central longitudinal axis a-a of the self-propelled welding machine 10. This arrangement helps to reduce the width of the self-propelled welding machine 10, because the prime mover 16 is orientated such that its smallest dimension extends widthways (i.e. in the direction extending between the first side 10c and the second side lOd).

[0089] The prime mover 16 is at least partially disposed between the pair of endless tracks 12a, 12b. In the embodiment of Figure 4, a majority of the prime mover 16 is interposed between the pair of endless tracks 12a, 12b. The prime mover 16 is arranged substantially on the central longitudinal axis a-a of the self-propelled welding machine 10. It shall be appreciated that in alternative embodiments, the prime mover 16 may be offset from the central longitudinal axis of the self-propelled welding machine 10. The arrangement of the prime mover 16 minimises the required width of the chassis, which increases the self-propelled welding machine's ability to access remote locations to perform a welding operation. Additionally, the arrangement of the prime mover 16 may improve the weight distribution of the self-propelled welding machine 10, thus enhancing lateral stability.

[0090] The prime mover 16 is located between the hydraulic system 20 and the electric arc welding unit 18. The prime mover 16 includes the first output 16a configured to drive the hydraulic system 20 and the second output 16b configured to power the electric arc welding unit 18 via the alternator 19, as illustrated in Figure 4. The prime mover 16 is run at a constant speed in order to provide the correct current to the welding unit 18. The first output 16a may extend towards the front 10a of the self-propelled welding machine 10, and the second output 16b may extend towards the rear 10b of the self-propelled welding machine 10. It shall be appreciated that in alternative embodiments, the direction of the first and / or second outputs 16a, 16b may be reversed. In the embodiment of Figure 4, both the first and second outputs 16a, 16b extend substantially parallel to the longitudinal axis a-a of the self-propelled welding machine 10.

[0091] The first output 16a is a power take off (PTO) shaft. In the embodiment illustrated in Figure 4, the PTO is connected to an engine flywheel (not shown), and the PTO shaft is connected to the hydraulic system 20 to drive the hydraulic system 20. In alternative embodiments, the flywheel may be connected to the second output 16b. It shall be appreciated that in alternative embodiments, any suitable arrangement of first and second output 16a, 16b (e.g. that utilises a gearbox or dropbox in conjunction with the prime mover 16) may be used to connect the prime mover 16 to the electric arc welding unit 18 and the hydraulic system 20 to transmit drive thereto.

[0092] The hydraulic system 20 is supported on the chassis 14. The hydraulic system 20 provides a hydrostatic transmission to the ground engaging structure 12a, 12b, and includes a hydraulic pump 50, the at least one hydraulic motor 40a, 40b (two motors 40a, 40b in the embodiment of Figures 1 to 5), a valve block 53 and a hydraulic fluid reservoir 54. It shall be appreciated that in alternative embodiments, the valve block 53 and / or the hydraulic fluid reservoir 54 may be omitted. The hydraulic system 20 also includes a plurality of hydraulic lines configured to connect components of the hydraulic system 20, for example to connect the first and second hydraulic motors 40a, 40b to the hydraulic pump 50.

[0093] As illustrated in Figures 3 and 4, the hydraulic system 20 is located towards the front 10a of the self-propelled welding machine 10. The hydraulic system 20 is located forward of the prime mover 16 along the central longitudinal axis a-a. This arrangement of the hydraulic system 20 minimises the length of hydraulic lines between the hydraulic pump 50 and the hydraulic motors 40a, 40b, thereby simplifying the hydraulic system 20. Additionally, the location of the hydraulic system 20 may help to improve the weight distribution of the welding machine 10.

[0094] The hydraulic fluid reservoir 54 is configured to supply hydraulic fluid to the hydraulic pump 50. The hydraulic fluid reservoir 54 is located above the hydraulic pump 50. This arrangement helps to reduce the length and width of the chassis 14 (as the hydraulic fluid reservoir 54 only raises a height dimension of the hydraulic pump 50). Additionally, locating the hydraulic fluid reservoir 54 above the hydraulic fluid pump 50 enables the use of a gravity infeed to supply hydraulic fluid to the hydraulic fluid pump 50.

[0095] The hydraulic pump 50 is configured to be driven by the prime mover 16, as illustrated schematically in Figure 5. As illustrated in Figure 4, it is therefore the hydraulic pump 50 which is connected to the first output 16a of the prime mover 16, for example to the PTO shaft. The hydraulic pump 50 is located towards the front of the welding machine 10 and forward of the prime mover 16. The hydraulic pump 50 is used to drive the at least one hydraulic motor 40a, 40b. In some embodiments, the hydraulic pump 50 may be continuously driven by the prime mover 16 when the prime mover 16 is turned on. In alternative embodiments, drive to the hydraulic pump 50 may be prevented, for example using a clutch (not shown) connected to the second output 16b.

[0096] The valve block 53 is configured to manage hydraulic functions of the welding machine 10 by controlling the flow of hydraulic fluid to components of the welding machine 10. The hydraulic pump 50 supplies pressurised hydraulic fluid to the first and second hydraulic motors 40a, 40b via the valve block 53, as illustrated schematically in Figure 5. The valve block 53 is therefore able to control the flow of hydraulic fluid to the first and second hydraulic motors 40, for example to control steering and / or braking. In the embodiment of Figure 1 to 5, the valve block 53 is located in the chassis frame 15 underneath the hydraulic pump 50.

[0097] The valve block 53 is configured to control the flow of hydraulic fluid to the first and second hydraulic motors 40a, 40b associated with each of the pair of endless tracks 12a, 12b in order to control steering of the welding machine 10. By way of example, the valve block 53 may supply more hydraulic fluid to one of the hydraulic motors 40a, 40b than the other of the hydraulic motors 40a, 40b depending on the desired direction of steering. It shall be appreciated that in alternative embodiments, only one hydraulic motor 40a, 40b may be provided, or more than two hydraulic motors 40a, 40b may be provided.

[0098] In order to control the flow of hydraulic fluid to the first and second hydraulic motors 40a, 40b, the valve block 53 includes at least two solenoid operated spool valves (not shown). A first solenoid operated spool valve controls the flow of hydraulic fluid to the first hydraulic motor 40a, and the second solenoid valve controls the flow of hydraulic fluid to the second hydraulic motor 40b. In this embodiment the spool valves are proportional and open centre. It shall be appreciated that in alternative embodiments, the valve block 53 may use other suitable directional control valves to control the flow of hydraulic fluid to the hydraulic fluid motors 40a, 40b.

[0099] The welding machine 10 is configured to be in communication with a remote control device 56. The remote control device 56 may be stored in a remote control charging point, for example located on the rear 10b of the welding machine 10. The remote control device 56 is operable to control movement of the welding machine 10, for example steering of the ground engaging structure 12a, 12b. The remote control device may be wireless or the remote control device 56 may be tethered to the welding machine 10 via electrical control cables. It shall be appreciated that the control device 56 may be removably tethered to the welding machine 10. Wireless remote control devices 56 may be particularly advantageous in application where health and safety is a significant concern, for example rail applications where terrain may be irregular. This is because the operator is less likely to be in the proximity of the machine and be injured in a roll-over situation or the like. Tethered remote control devices 56 require less complex hardware, and therefore have the advantage of simplicity.

[0100] The remote control device 56 is in communication with the valve block 53 in order to control movement of the ground engaging structure 12a, 12b. The remote control device 56 produces an electric signal when the user actuates a control member of the remote control device 56, and the electric signal is received by the valve block 53 and used to control the first and second solenoid valves. The welding machine 10 includes a remote control unit (not shown) located on the welding machine 10 and configured to communicate with the remote control device 56. The remote control unit may include a receiver configured to receive the electric signal. The remote control unit includes at least one relay, which is electrically connected to the valve block 53, for example to the first and second solenoid valves.

[0101] It shall be appreciated that in alternative embodiments, the welding machine 10 may be controlled from a location on the welding machine 10 (i.e. the welding machine 10 may not be remote controlled). In such embodiments, the welding machine 10 may include one or more control devices (not shown) located thereon for controlling operations of the welding machine 10, for example for controlling movement of the ground engaging structure 12a 12b. In one embodiment, the control device, for example a control lever, may communicate with the valve block 53 in order to control the ground engaging structure 12a, 12b.

[0102] The welding unit 18 is configured to perform a welding operation on a component remote from the welding machine 10. The welding machine 10 may be applicable for use in the rail industry, construction industry, oil and gas industry and / or the agricultural industry, military and defence, infrastructure and / or emergency repairs. The component remote from the welding machine 10 may, by way of example, be a rail track, a beam or column, frame members, pipelines, plates and / or a vehicle component. A power output of the welding unit 18 (expressed in terms of current) may be up to 600 amps, for example up to 300 amps. In the embodiment of Figures 1 to 5, the welding unit 18 is a single output welding unit 18 and the power output of the welding unit 18 is up to 300 amps. In alternative embodiments, the welding unit 18 may be a dual output welding unit 18.

[0103] In some embodiments, the welding unit 18 may have a larger power output than the welding unit 18 of the Figures. For example, the power output of the welding unit 18 may be up to 800 amps, for example up to 700 amps.

[0104] The welding unit 18 is supplied with electrical power from the alternator 19, and includes at least one electrode (not shown) located in an electrode holder or torch, a ground clamp and a cable arrangement (not shown) configured to connect the alternator (or machine power source) to the at least one electrode and a supply of welding material. The unit may be a metal inert gas (MIG) and / or manual metal arc (MMA) welder.

[0105] It shall be appreciated that in alternative embodiments, the alternator 19 may be omitted, as will be described in more detail below. The welding unit 18 is powered by the machine power source 17. In the embodiment illustrated in Figure 4, the machine power source 17 is the prime mover 16. It shall be appreciated that in alternative embodiments, the machine power source 17 may not be the prime mover 16, as will be described in more detail below.

[0106] The welding unit 18 is arranged to be in line with the prime mover 16. In some embodiments, a central longitudinal axis of the welding unit 18 may be coaxial with a central longitudinal axis of the prime mover 16. The central longitudinal axis of the welding unit 18 may be arranged substantially on the central longitudinal axis a-a of the welding machine 10. The welding unit 18 is located towards the rear 10b of the welding machine 10, as illustrated in Figure 4.

[0107] The alternator 19 is mounted to the welding unit 18, and therefore in this embodiment forms part of the welding unit 18. It shall be appreciated that in alternative embodiments, the alternator 19 and the welding unit 18 may be provided separately. The alternator 19 provides direct current (DC) to the welding unit 18. The prime mover 16 drives the alternator 19 to provide electrical power to the welding unit 18. The alternator 19 may be directly mounted to the prime mover 16, for example bolted to the prime mover 16. The alternator 19 is configured to be driven continuously by the prime mover 16 when the prime mover 16 is operating in this embodiment, but in other embodiments a clutch may be provided to selectively disconnect drive.

[0108] The alternator 19 is arranged to be in line with the prime mover 16. The alternator 19 is connected to the second output 16b of the prime mover 16. As such, the hydraulic pump 50, the prime mover 16 and the alternator 19 are in line with one another. In some embodiments, the hydraulic pump 50, prime mover 16 and alternator 19 may be arranged to be substantially symmetrical about the central longitudinal axis a-a of the self-propelled welding machine 10.

[0109] The at least one electrode conducts electrical current from the machine power source 17 to the welding material. The at least one electrode is held in the holder or torch. In some embodiments, one electrode is provided, however more than one electrode may be provided, for example to increase welding speed or deposit more welding material.

[0110] An electrode oven (not shown) may be supported on the chassis 14. In the embodiment of Figures 1 to 4, the electrode oven is located in one of the storage devices 34a, 34b. The at least one electrode is stored in the electrode oven prior to being used in a welding operation. The electrode oven is configured to supply heat energy to the at least one electrode. This helps to keep the electrodes warm and dry, thereby increasing the efficiency of the welding process and increasing the quality of welds. Storing the electrode oven in the storage device 34a, 34b is advantageous compared to known machines, wherein the electrode oven has to be carried alongside the machine. As the electrode oven can be bulky and heavy, this poses a health and safety risk and increases inconvenience to the operator. It shall be appreciated that in alternative embodiments, the electrode oven may be omitted.

[0111] The clamping device is attached to the component to be welded during the welding operation, and helps to ensure electrical grounding and completes the electrical circuit for the welding operation, as is known in the art. The cable arrangement is connected to the clamping device. The cable arrangement, the clamping device and the electrode holder may also be stored in the storage device 34a, 34b. It shall be appreciated that in some embodiments the welding machine 10 may include a cable drum (not shown) configured to assist with storing the cable arrangement if lengths of the order of 10 or 20m are required, and cannot be held in a storage device 34a, 34b.

[0112] The control panel 30 is located on the welding machine 10. The control panel 30 is configured to control at least one machine parameter. The machine parameter may be a parameter of the prime mover 16. For example, the control panel 30 may include a control member to turn the prime mover on / off. Additionally or alternatively, the control panel 30 may include an emergency stop button configured to halt all operations of the welding machine 10 in the event of an emergency. This helps to improve the safety of the welding machine 10. In addition, the welding machine 10 may include control members to control the supply of current and / or voltage to the welding unit 18, and / or to auxiliary components of the self-propelled welding machine 10, and / or to switch the lighting tower 26 and any additional lighting on and off. In some embodiments, the control panel 30 may include a control member to turn on and off the supply of tractive power to the ground engaging structure 12a, 12b, for example during a welding operation.

[0113] The welding machine 10 includes at least one electric power take-off point 21 powered by the machine power source 17, as illustrated schematically in Figure 5. The power take-off point 21 is powered by the prime mover 16 as the machine power source 17, because the machine power source 17 powers the alternator 19.

[0114] The power take-off 21 is configured to supply power to auxiliary components of the welding machine 10. By way of example, the electric power take-off 21 may be used to power the lighting tower 26, remote lighting or power tools such as saws and / or grinders. The electric power take-off 21 may include a plurality of sockets, for example four sockets. The sockets may be located on an operator interface (not shown) to which, by way of example, the plugs / connectors for the lighting tower 26, welding electrode, clamping device and one or more power tools may be plugged in. The operator interface may be located at any suitable location on the welding machine 10, for example on one of the first or second side 10c, lOd. Locating the power outputs at the same location, e.g. on the operator interface, helps to improve operator convenience.

[0115] The power take-off 21 is particularly advantageous because it enables the supply of electrical power to the auxiliary components of the self-propelled welding machine 10 at the same time the welding unit 18 is performing the welding operation. The alternator 19 provides alternating current (AC) to the power takeoff 21. In some embodiments, the alternator 19 may provide three phase power to the power take-off 21. Alternatively, the alternator 19 may provide single phase 110V power to the power take-off 21. This may be particularly advantageous when the welding machine 10 is used for rail applications, where 110V is commonly used to comply with safety regulations.

[0116] The back-up power source 24 is configured to supply drive to the ground engaging structure 12a, 12b when a fault condition of the prime mover 16 is determined. The back-up power source 24 may be a battery and electric motor, or in alternative embodiments the back-up power source is a hand crank operable by a person and connected to the hydraulic pump 50. The back-up power source 24 supplies the power to enable the ground engaging structure 12a, 12b to move the welding machine 10 to a safe location in an emergency condition. For example, if the welding machine 10 is operating proximate to rail tracks, it enables the welding machine 10 to move away from the tracks if a train approaches, even if the prime mover 16 is inoperable.

[0117] The lighting tower 26, illustrated in Figure 1 to 4, is mounted to the self-propelled welding machine 10. The lighting tower 26 is used to illuminate a welding site, for example at night. This helps to improve safety and speed of the welding operation. By way of example, the lighting tower 26 may be mounted to the roll cage 32. The lighting tower 26 extends in a generally vertical direction from the welding machine 10.

[0118] The lighting tower 26 is extendable such that a total height of the lighting tower 26 increases so the light can illuminate an increased ground area with minimal shadowing. The lighting tower 26 may be pivotably extendable, and / or the lighting tower 26 may be telescopically extendable, as illustrated in Figures 1 to 4. The lighting tower 26 may be manually or automatically extendable. The lighting tower 26 is moveable between a stowed position and deployed position. The lighting tower 26 may be automatically or manually moveable between the stowed and deployed position. A total height of the welding machine 10 is reduced in the stowed position compared to the deployed position. This may be particularly advantageous when the welding machine 10 is transported in or on a vehicle with spatial restrictions, or the welding machine 10 is moving underneath trees.

[0119] In some embodiments, the lighting tower 26 is attached to the welding machine 10 in the stowed position. In some embodiments, the lighting tower 26 is removable from the self-propelled welding machine 10 in the stowed position, and may be stowed onboard the welding machine 10, for example in one of the storage devices 34a, 34b. The lighting tower 26 may be pivotable between the deployed position and the stowed position. By way of example, the lighting tower 26 may lie flat against the roof 33 of the roll cage 32 in the stowed position, and be rotated to extend substantially vertically from the self-propelled welding machine 10 in the vertical position.

[0120] The at least one storage device 34a, 34b is configured to store components of the welding machine 10 and components used for welding, such a tools, cabling and / or the electrode oven, as described above. This improves tidiness of the welding machine 10, and reduces the number of components which need to be carried by the operator to perform the welding operation. In the embodiment of Figures 1 to 4, as illustrated in Figure 2, a first storage device 34a, 34b is provided on the first side 10c of the welding machine 10 and a second storage device 34a, 34b is provided on the second side lOd of the welding machine 10. The first and / or second storage device 34a, 34b is / are removably mounted to the chassis 14. The first and second storage devices 34a, 34b are trays, however any suitable storage device may be used. It shall be appreciated that any suitable number of storage devices 34a, 34b may be used, for example one storage device or more than two storage devices. The storage devices 34a, 34b extend along a majority of the chassis 14.

[0121] The prime mover 16, hydraulic system 20 and welding unit 18 are located between the storage devices 34a, 34b. The storage devices 34a, 34b may extend outwardly in the width direction from the chassis 14, as illustrated in Figure 2. This increases the storage volume of the storage devices 34a, 34b, whilst improving accessibility to the storage devices 34a, 34b. The storage devices 34a, 34b are supported on each of the first and second section 15a, 15b of the chassis frame 15.

[0122] In some embodiments, the welding machine 10 may include an indicator 37 configured to indicate an operational state of the welding machine 10. The indicator 37 may be configured to indicate at least one of: motion of the welding machine 10, an active state of the welding machine 10 and / or a fault state of the welding machine 10. The indicator 37 helps to increase the safety of the welding machine 10 by indicating an operational state an alerting nearby persons or vehicles to the operational state of the welding machine 10. The indicator 37 may be a visual indicator 37 or an audio indicator 37. By way of example, the visual indicator 37 may illuminate or flash a different colour depending on the operational state of the welding machine 10. As illustrated in Figures 1 to 4, the indicator 37 is mounted to the roof 33 of the self-propelled welding machine 10.

[0123] In some embodiments, the welding machine 10 includes an inclinometer (not shown) configured to measure an inclination of the welding machine 10 in at least one direction. The welding machine 10 may be configured to stop or prevent the supply of tractive power to the ground engaging structure 12a, 12b when the inclination of the welding machine 10 exceeds a predetermined threshold. The inclinometer increases safety of the welding machine 10 by preventing the welding machine 10 from moving along the ground surface when the inclination of the welding machine 10 exceeds a safe threshold. This may be particularly advantageous in the rail industry, where terrain is typically irregular.

[0124] The inclinometer is configured to measure the lateral inclination of the welding machine 10 about the central longitudinal axis a-a of the welding machine 10 and / or the back-forth inclination of the welding machine 10 about an axis perpendicular to the central longitudinal axis a-a of the welding machine 10. The predetermined threshold therefore includes a lateral predetermined threshold and a back-forth predetermined threshold. The lateral predetermined threshold may be up to 40°, for example up to 35°, and the back-forth predetermined threshold may be up to 35°, for example up to 30°. Limits within these ranges have been found to be stable inclinations of the self-propelled welding machine 10.

[0125] In some embodiments, the welding machine 10 includes at least one attachment location 36, illustrated in Figure 3. The attachment location 36 is a central hook eye 36, however any suitable attachment may be used. The attachment location 36 is configured to attach a lifting device (not shown), for example a hook of a working machine. This helps to improve the transportability of the welding machine 10. The attachment location 36 is located on an uppermost surface of the welding machine 10, for example on the roof 33.

[0126] In some embodiment, the welding machine 10 includes an operator platform (not shown) pivotally connected to the welding machine 10 and moveable between a deployed position for supporting an operator thereon and a stowed position. The operator platform may be pivotally connected to the rear 10b of the welding machine 10, by way of example. The operator platform may be used to support the operator whilst the operator controls the welding machine 10. In alternate embodiments, the operator may control the welding machine 10 from a location remote from the welding machine 10. The operator may control the welding machine 10 from both the operator platform and the remote location during a single moving operation.

[0127] In some embodiments, the self-propelled welding machine 10 includes a deployable ramp (not shown). The ramp may be used, by way of example, for a rail line crossing or for the welding machine 10 to mount a railway platform, bogie or alternative vehicle for transportation. The ramp may be stored on the welding machine 10, for example in one of the storage trays 34a, 34b.

[0128] In some embodiments, the self-propelled welding machine 10 may include an attachment, such as a clevis or ball, (not shown) configured to attach a vehicle, for example a trailer. The welding machine 10 may therefore be used as a tow vehicle in some applications.

[0129] In operation the machine 10 is driven to the work site by an operator controlling the remote control device 56 to open and close the valves in the valve block to drive the hydraulic motors 40a, 40b for travel and steering. Once at the desired location on the work site the drive to the motors 40a, 40b is disengaged, but the prime mover 16 may remain running. The lighting tower 26 may be deployed and switched on if needed to illuminate the work site. An operator can remove the electrodes, electrode holder, ground clamp and associated cabling from the storage devices 34a and 34b and connect up to the workpiece to be welded and undertake the welding operation(s). The prime mover 16 is controlled so as to provide the required power output for the welding operation and ancillary power for the lighting, tools etc.

[0130] Alternative embodiments of the welding machine 10 will be described hereafter. It shall be appreciated that the features of the embodiment of Figures 1 to 5 are, on the whole, applicable to the alternative embodiments, and the differences will be described hereafter.

[0131] In a first alternative embodiment, illustrated in Figure 6, the welding machine 10 may be a hybrid welding machine 10. In this embodiment, the hydraulic system 20 may be omitted, and the ground engaging structure 12a, 12b may be powered by at least one electric motor 140a, 140b, for example a first electric motor 140a to drive the first pair of endless tracks 12a and a second electric motor 140b to drive the second pair of endless tracks 12b. It shall be appreciated that in alternative embodiments, any suitable number of electric motors 140a, 140b may be provided, for example more than two electric motors 140. The electric motors 140a, 140b are supplied with electrical power from the alternator 19, which is powered by the prime mover 16, 17.

[0132] In this embodiment, an electrical energy storage device, for example a battery module 100 may be provided to store electrical energy from the alternator 19 (or from an external supply of electrical energy). By way of example, the battery module 100 may store electrical energy from the alternator 19 when the welding machine 10 is travelling to the welding location (i.e. the engine 16 is running but the welding unit 18 is not being used). This helps to increase the efficiency of the welding machine 18 by utilising electric power from the alternator 19.

[0133] It shall be appreciated that in this embodiment, the battery module 100 may perform the function of the back-up power source described above, and use the stored electrical energy to power the electric motors 140a, 140b if the prime mover 16 fails. Additionally or alternatively, as illustrated in Figure 6, the battery module 100 may use the stored electrical energy to power auxiliary components of the welding machine 10, for example the lighting tower 26, when the engine 16 is not running. Although the lighting tower 26 is illustrated in Figure 6 for simplicity, it shall be appreciated that the battery module 100 may be used to power any suitable auxiliary component. The battery module 100 may also power the electric motors 140a, 140b if near silent travelling of the welding machine 10 is desired.

[0134] As the valve block 53 is not present in the embodiment of Figure 6, the welding machine 10 may include an onboard receiver 57 configured to receive the signal from the remote control device 56 and control the electric motors 140a, 140b to control steering and / or drive of the welding machine 10.

[0135] In Figure 6, the welding unit 18 is powered by the alternator 19. Alternatively, although not shown, particularly if the welding unit 18 is a low amp unit, then the alternator 19 may charge the electric storage device and the electric energy storage device may power the welding unit 18.

[0136] Alternatively, although not shown in the Figures, the embodiment of Figure 6 may be combined with a hydraulic system. In this embodiment, the hydraulic pump 50 may be an electric hydraulic pump 50, and the alternator 19 or the battery module 100 may be used to provide electrical power to the electric hydraulic pump 50, which in turn supplies pressurised hydraulic fluid to the hydraulic motors 140a, 140b, as described above.

[0137] In a further alternative embodiment (not shown), the self-propelled welding machine 10 may be an electric welding machine 10. In this embodiment, the prime mover 16 is an electric motor and the machine power source 17 is a battery or hydrogen fuel cell. In this embodiment, the alternator 19 may be omitted and the battery or hydrogen fuel cell supplies electrical power directly to the welding unit 18.

[0138] Although the teachings have been described above with reference to one or more preferred embodiments, it will be appreciated that various changes or modifications may be made without departing from the scope as defined in the appended claims.

Claims

Claims1. A self-propelled welding machine comprising a front and a rear defined by a principal direction of travel, the welding machine comprising: a ground engaging propulsion structure, for example a pair of endless tracks; a chassis mounted to the ground engaging structure; a prime mover mounted to the chassis and operable to provide motive power to the ground engaging structure; an electric arc welding unit configured to perform a welding operation on a component remote from the welding machine; and a power source to provide electrical power to the welding unit.

2. The self-propelled welding machine according to claim 1, wherein the machine power source is the prime mover and the self-propelled welding machine comprises an alternator, and wherein the prime mover is configured to drive the alternator to provide electrical power to the welding unit.

3. The self-propelled welding machine according to claim 2, wherein the welding unit is in line with the prime mover, optionally wherein the alternator is in line with the prime mover.

4. The self-propelled welding machine according to any preceding claim, wherein an axis of an output shaft of the prime mover extends substantially parallel to a central longitudinal axis of the self-propelled welding machine.

5. The self-propelled welding machine according to claim 4, wherein the prime mover is at least partially interposed between the pair of endless tracks, optionally wherein a majority of the prime mover is interposed between the pair of endless tracks.

6. The self-propelled welding machine according to any preceding claim, comprising a hydraulic system supported on the chassis and configured to provide motive power from the prime mover to the ground engaging structure, wherein the hydraulic system comprises a hydraulic pump and a hydraulic motor.

7. The self-propelled welding machine according to claim 6, wherein the hydraulic system is located towards the front of the self-propelled welding machine.

8. The self-propelled welding machine according to claim 6 or claim 7, wherein the hydraulic system further comprises a hydraulic fluid reservoir, and wherein the hydraulic fluid reservoir is located above the hydraulic pump.

9. The self-propelled welding machine according to any one of claims 6 to 8, wherein the hydraulic system comprises a valve block, and wherein the at least one hydraulic motor comprises first and second hydraulic motors configured to drive each of the pair of endless tracks, and wherein the valve block is configured to control the flow of hydraulic fluid to the first and second hydraulic motors in order to control steering and / or drive direction of the pair of endless tracks.

10. The self-propelled welding machine according to any one of claim 6 to 9 when dependent on claim 2, wherein the prime mover is located between the hydraulic pump and the alternator, and wherein the prime mover comprises a first output configured to drive the hydraulic pump and a second output configured to drive the alternator.

11. The self-propelled welding machine according to any preceding claim, wherein the self-propelled welding machine is configured to be in communication with a remote control device, and wherein the remote control device is operable to control movement of the self-propelled welding machine.

12. The self-propelled welding machine according to claim 11, wherein the remote control device is wireless or wherein the remote control device is tethered to the self-propelled welding machine.

13. The self-propelled welding machine according to any preceding claim, comprising a fuel or electrical energy storage device located below the prime mover and configured to supply fuel or electricity to the prime mover, optionally wherein the fuel or electrical energy storage device extends along a majority of the chassis.

14. The self-propelled welding machine according to claim 13 when dependent on claim 6, wherein the fuel or electrical energy storage device terminates before the front of the self-propelled welding machine to define a space therebetween, and wherein the hydraulic system extends through the space to supply hydraulic fluid to the ground engaging structure.

15. The self-propelled welding machine according to claim 13 or claim 14, wherein the fuel or electrical energy storage device is located between the prime mover and the ground engaging structure.

16. The self-propelled welding machine according to any preceding claim, comprising a back-up power source configured to supply drive to the ground engaging propulsion structure when a fault condition of the prime mover is determined, optionally wherein the back-up power source is a battery.

17. The self-propelled welding machine according to any preceding claim, wherein the welding unit comprises an electrode oven supported on the chassis, and wherein the electrode oven is configured to supply heat energy to at least one welding electrode.

18. The self-propelled welding machine according to any preceding claim, comprising at least one electric power-take off point powered by the machine power source and configured to supply power to auxiliary components of the self-propelled welding machine.

19. The self-propelled welding machine according to any preceding claim, comprising an indicator configured to indicate an operational state of the self-propelled welding machine, optionally wherein the indicator is configured to indicate at least one of: motion of the self-propelled welding machine, an active state of the self-propelled welding machine and / or a fault state of the self-propelled welding machine.

20. The self-propelled welding machine according to any preceding claim, comprising a lighting tower configured to illuminate a work area, optionally wherein the lighting tower is moveable between a deployed position and a stowed position, and wherein a total height of the self-propelled welding machine is reduced in the stowed position compared to the deployed position.

21. The self-propelled welding machine according to any preceding claim, wherein the power output of the prime mover is up to 24kW, for example up to 14kW and / or wherein the welding unit is configured to deliver up to 600 amps of current, for example up to 350 amps of current.

22. The self-propelled welding machine according to any preceding claim, wherein the self-propelled welding machine defines a mass up to 2700kg, for example up to 750kg, optionally up to 500kg.

23. The self-propelled welding machine according to any preceding claim, comprising a control panel located on the body of the self-propelled welding machine and configured to control at least one machine parameter, optionally wherein the machine parameter is a parameter of the prime mover.

24. The self-propelled welding machine according to any preceding claim, comprising a roll cage mounted to the chassis, and wherein the prime mover and the welding unit are located within the roll cage.

25. The self-propelled welding machine according to any preceding claim, wherein the self-propelled welding machine defines a length extending along the longitudinal axis of the self-propelled welding machine and wherein the length is up to 1500mm and / or wherein the self-propelled welding machine defines a width extending along an axis perpendicular to the longitudinal axis of the self-propelled welding machine and wherein the width is up to 850mm and / or wherein the wherein the self-propelled welding machine defines a height extending along an axis perpendicular to the longitudinal axis of the self-propelled welding machine and wherein the height is up to 1000mm.

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