A laser seam welding system for a stainless steel roofing system

Abstract

The application discloses a stainless steel roof laser seam welding system and belongs to the technical field of building metal roof welding. The application aims to solve the problems of easy perforation and slow welding speed in the existing resistance seam welding process. The application comprises a main body structure, a support, a stainless steel roof panel and a laser head. The laser head is arranged in non-contact with the stainless steel roof panel, moves along the panel rib and emits a laser beam to perform laser seam welding on the joint between the panel ribs of adjacent roof panels. Further, the application also comprises a self-walking welding trolley which comprises a walking trolley frame, a height adjusting mechanism and a laser device. The laser head is synchronously lifted with the laser device. The trolley is provided with a clamping driving mechanism, a wire feeder, a protective gas supply device and a heat dissipation wheel. The application adopts non-contact laser welding, avoids metal adhesion and perforation, and the welding speed can reach five to ten meters per minute. The welding quality and efficiency are significantly improved, the environmental protection performance is outstanding, and the application is suitable for high-quality and rapid welding of a stainless steel roof system.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a laser seam welding system for stainless steel roofing systems. Background Technology

[0002] In stainless steel roofing systems, continuous welding is required between roof panels to ensure the roof's airtightness and structural strength. Currently, resistance welding, known as "roll welding," is the conventional method. This process applies pressure and current through two rotating roller electrodes, causing resistance heat to be generated at the contact point, forming a continuous weld.

[0003] However, based on extensive testing and field construction experience, stainless steel resistance welding has two serious problems:

[0004] (1) Welding perforation. When the copper ring used for roll welding comes into contact with stainless steel, metal adhesion is likely to occur. Stainless steel particles will adhere to the surface of the copper ring, producing burrs. These burrs can penetrate the stainless steel plate, seriously affecting the welding quality.

[0005] (2) Slow welding speed. To ensure quality, frequent machine stops are required to clean shavings and replace copper rings, which severely limits the welding speed.

[0006] Therefore, there is an urgent need for a new type of welding system that can simultaneously solve the problem of weld perforation and significantly improve welding speed. Summary of the Invention

[0007] The purpose of this invention is to provide a laser seam welding system for stainless steel roofs, aiming to solve the technical problems of severe weld perforation and slow welding speed in existing resistance welding processes. To achieve the above objective, this invention adopts the following technical solution, and accordingly obtains the beneficial effects brought about by each technical feature.

[0008] To address the core problems of traditional resistance welding, such as stainless steel adhesion and perforation due to contact and pressure, and the resulting low speed due to frequent shutdowns for cleaning, this invention provides a laser seam welding system for stainless steel roofs. The system includes a main structure, supports fixed to the main structure, and stainless steel roof panels mounted on the supports. Specifically, it also includes a laser head positioned in non-contact with the stainless steel roof panels. This laser head can move along the ribs of the stainless steel roof panels and emit a high-energy-density laser beam to perform laser seam welding at the joints between the ribs of adjacent stainless steel roof panels.

[0009] The supports are fixed to the main structure with self-tapping screws, and the stainless steel roof panels are fastened or fixed to the supports. The laser head is independent of the roof panel and does not make any mechanical contact with the panel surface. During operation, the laser head moves along the rib direction of the panel, and the laser beam instantly melts the base material at the joint to form a molten pool, which, after cooling, forms a continuous weld. Because the laser head does not contact the workpiece at all, the metal adhesion and shavings generated by resistance welding are fundamentally avoided, thus eliminating the weld perforation caused by these issues. At the same time, there is no need to clean shavings or replace electrodes, and the welding process can be carried out continuously, thereby increasing the welding speed to more than 10 times that of resistance welding. This technical solution solves the two most critical engineering problems of "perforation" and "slow speed" with the simplest structure.

[0010] To enable the laser head to move stably and automatically along the ribs, avoiding the instability of manual hand-held operation, a self-propelled welding carriage is further introduced in this embodiment. This self-propelled welding carriage includes a carriage frame, a height adjustment mechanism, and a laser. The laser is mounted on the carriage frame and connected to the laser head via optical fiber. The height adjustment mechanism, also mounted on the carriage frame and connected to the laser, is used to adjust the height of the laser, with the laser head rising and falling synchronously with it. The entire self-propelled welding carriage carries the laser and laser head, automatically moving along the ribs.

[0011] The advantages of this design are twofold: firstly, the welding speed is uniformly controlled by the trolley, ensuring the uniformity of the weld; secondly, it achieves automated welding, freeing up operators and making it particularly suitable for long-distance continuous operations on rooftops. Furthermore, by directly adjusting the laser's height via the height adjustment mechanism, the defocusing amount between the laser head and the panel can be precisely controlled without directly operating the delicate optical head, avoiding the risks of fiber optic bending or laser head collisions, resulting in a more reliable structure.

[0012] Considering the complex working conditions such as the slope and differences in the shape of the ribs on the roof, the drive mechanism of the self-propelled welding trolley was carefully designed in this embodiment. The trolley includes a clamping drive mechanism, which consists of a drive wheel, a floating wheel, a motor, and a reducer. The drive wheel and the floating wheel are mounted on the trolley frame and clamp the ribs together. In particular, the floating wheel is not powered and only rotates as a passive driven wheel. The motor and reducer are fixed to the trolley frame and are dedicated to driving the drive wheel to rotate. The entire trolley is propelled forward by the friction between the drive wheel and the ribs.

[0013] In terms of connection, the drive wheel and the floating wheel are arranged opposite each other on both sides of the rib plate, and are adaptively clamped by a spring or pneumatic mechanism. When the motor starts, the drive wheel rotates actively, and the floating wheel is rotated by the rib plate. Together, they clamp the rib plate and generate traction force. This "one drive, one follower" clamping method ensures sufficient forward friction and avoids the asynchronous slippage problem that may occur with dual drives. At the same time, the adaptive characteristics of the floating wheel can automatically compensate for the slight bending or thickness fluctuation of the rib plate, making the trolley move smoothly and the laser head center accurately.

[0014] For applications requiring filler metal to ensure weld quality in thick plates or large gaps, a wire feeding function is added in this embodiment. The system also includes a wire feeder connected to a wire feeding nozzle via a wire feeding tube. The nozzle is mounted on the trolley frame and positioned adjacent to the laser head. During welding, the wire feeder delivers the welding wire through the nozzle to the front of the molten pool at a set speed. The laser beam simultaneously melts both the base metal and the welding wire, forming a filler weld. This "laser + filler wire" method not only fills the gaps between plate ribs but also improves the weld's corrosion resistance by adjusting the welding wire composition, expanding the system's adaptability to different plate thicknesses and grades of stainless steel roofing.

[0015] To prevent contamination of the high-temperature molten pool by oxygen and nitrogen in the air during laser welding, which could lead to porosity or oxide inclusions, a shielding gas supply device is introduced in this embodiment. This device is connected to the vicinity of the laser head via a gas pipe, continuously spraying shielding gas during welding to form a stable gas shield around the molten pool and welding area. Argon is further preferred as the shielding gas. Argon is an inert gas with a density greater than air, easily covering the surface of the molten pool and providing excellent insulation. In actual operation, the shielding gas flow rate can be dynamically adjusted according to the welding speed, thereby ensuring a dense microstructure and no oxidation discoloration of the weld metal. This is particularly important for stainless steel roofs with high aesthetic requirements, as it directly affects the long-term weather resistance and aesthetics of the roof.

[0016] Although laser welding reduces heat input by more than 80% compared to resistance welding, heat accumulation during high-speed continuous welding can still cause thermal deformation or even localized burn-through in extremely thin stainless steel roof panels (typically 0.5~1.0mm thick). To address this, a heat dissipation wheel is installed. This wheel is located on the opposite side of the stainless steel roof panel (i.e., the back of the panel) opposite the laser head and is in close contact with the panel surface. The heat dissipation wheel is also mounted on the frame of a traveling carriage, allowing it to move synchronously with the welding process. Furthermore, the heat dissipation wheel is made of copper due to its extremely high thermal conductivity.

[0017] During operation, the laser head heats and welds in front, while the heat sink wheel follows closely behind, absorbing and dissipating excess heat from the back, essentially acting as a portable heat sink. This design offers significant advantages: it actively controls the peak temperature and cooling rate of the welding thermal cycle, preventing weld perforation (especially in unsupported, suspended areas) and refining the grain structure of the weld and heat-affected zone, thus improving the joint's mechanical properties. The copper heat sink wheel's heat conduction efficiency is several times that of stainless steel, enabling rapid dissipation of localized heat across a large roof panel, preventing heat concentration.

[0018] Since the rib heights may vary between different roofing system models, and laser welding requires precise focus control within ±0.2mm, this embodiment specifies the height adjustment mechanism as either a screw-nut pair or an electric push rod. This mechanism is used to adjust the relative height between the laser and the stainless steel roofing panel before or during welding. Before welding begins, the operator raises and lowers the laser using the height adjustment mechanism based on the actual rib height. The laser head rises and falls synchronously, thus precisely setting the defocus amount. During welding, if rib height fluctuations occur, the height adjustment mechanism can also work with sensors to achieve closed-loop automatic height adjustment. This technical solution ensures a consistently stable laser beam power density, guaranteeing uniform weld depth and width, and preventing incomplete welds or burn-through caused by changes in defocus amount.

[0019] To optimize the system's operation, key process parameters for the laser beam emitted by the laser head were defined: a focal power density of 10. 4 Up to 10 7 W / cm 2 The welding speed is 5 to 10 m / min. This parameter range is derived from the technical specifications based on extensive testing. Power density is below 10. 4 W / cm 2 It is difficult to form a stable keyhole, and the penetration depth is insufficient; above 10 7 W / cm 2 Overheating is likely. A welding speed of 5-10 m / min allows for full utilization of the high-speed advantage of laser welding (compared to 0.5 m / min for resistance welding) while ensuring sufficient penetration and weld formation. This limited parameter range allows the system to be quickly and reliably deployed in industrial settings without repeated trial and error, demonstrating strong engineering practicality.

[0020] This invention provides a laser seam welding system for stainless steel roofing systems, which has the following advantages:

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. Achieving rapid assembly, disassembly, and reuse, significantly improving construction efficiency and economic benefits: This invention adopts a fully bolted assembly structure, completely eliminating the welding process. Installation only requires tightening the bolts and screws; disassembly is done by reversing the process, eliminating the need for professional welders and complex pre- and post-weld treatments, resulting in extremely fast assembly and disassembly. The lifting lug can be completely disassembled and reused for different components, significantly reducing the tooling storage costs and material waste caused by the "one-time use" nature of traditional welded lifting lugs, thus significantly reducing overall construction costs.

[0023] 2. Non-destructive connection throughout, maximizing the protection of component integrity: The core connection method of this invention utilizes the existing bolt holes on the web stiffening plate for fixing, eliminating the need for any additional welding, cutting, or drilling on the main body of the component. This completely avoids damage to the mechanical properties of the base material caused by the welding heat-affected zone, welding deformation, and subsequent repair and grinding damage to the component's precision and surface, fundamentally protecting the structural integrity and service life of the component.

[0024] 3. High versatility and adaptability: One lifting lug can handle various component specifications. Through a series of ingenious adjustable designs, this invention achieves outstanding versatility. Specifically: adjusting the distance between the top plate and the lug body using a long bolt (second fastener) allows for adaptation to different flange thicknesses; adjusting the distance between the two top plates using a long screw (third fastener) allows for adaptation to different flange widths; and providing an elongated hole (first connecting hole) on the lug body allows for adaptation to different existing bolt hole spacings on the web stiffening plate. Furthermore, it supports single-sided or double-sided arrangement, allowing for flexible selection based on the lifting load. This high degree of adaptability reduces the need for numerous lifting lugs of specific specifications.

[0025] 4. Reasonable stress distribution and high stability significantly improve lifting operation safety: This invention utilizes a composite structure of "ear plate body - web stiffening plate" fixation and "top plate - flange" clamping, achieving coordinated transfer and dispersion of lifting loads to the flanges and web stiffening plates of the component, effectively avoiding the severe stress concentration phenomenon at the weld root of traditional welded lifting lugs. Key connecting components (such as long bolts and long threaded rods) all possess sufficient strength specifications, and the symmetrical arrangement on both sides further balances the load. The optimal control of the wire rope angle (45°-60°) also optimizes the force flow direction. These designs reduce the risk of lifting lug failure and component fall from multiple dimensions, ensuring lifting safety.

[0026] 5. Clear and Reliable Structure: The ear plate body adopts a split design (connecting plate and extension plate), with clearly defined functions. Local rigidity and connection strength can be enhanced by adding side plates and stiffening plates. The top plate has sufficient thickness (e.g., not less than 50mm) to ensure its rigidity as a load-bearing component. The entire device has a reasonable structural design, with clear connections between components, ensuring overall structural stability under heavy loads. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the operation of the stainless steel roof laser seam welding system of the present invention.

[0029] Figure 2 This is a schematic diagram showing the relative positions of the heat sink wheel and the laser head.

[0030] Figure 3 This is a schematic diagram of a self-propelled welding trolley.

[0031] Figure 4 This is a schematic diagram of the clamping drive mechanism.

[0032] Figure 5 This is a schematic diagram of the control system, power supply, cooler, and wire feeder. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example

[0035] The following is a detailed description of a typical embodiment of the stainless steel roof laser seam welding system of the present invention, with reference to the accompanying drawings. This embodiment takes the stainless steel metal roofing project of a large public building as the application scenario. The roof panel is made of SUS304 stainless steel profiled sheet with a thickness of 0.6mm and a rib height of 30mm.

[0036] I. Overall System Composition

[0037] like Figures 1 to 5 As shown, the stainless steel roof laser seam welding system of this embodiment mainly includes the following components: self-tapping screw 1, support 2, main structure 3, metal roof panel 4, laser head 5, wire feed nozzle 6, heat dissipation wheel 7, weld seam 8, self-propelled welding carriage 9, clamping drive mechanism 10, power supply and cooling machine 11, and wire feeder 12.

[0038] The self-propelled welding trolley 9 further includes a trolley frame 9.1, a height adjustment mechanism 9.2, and a laser 9.3. The clamping drive mechanism 10 includes a drive wheel 10.1, a floating wheel 10.2, and a motor and reducer 10.3.

[0039] II. Connection Relationships and Installation Locations of Each Component

[0040] (a) Installation of roof base system

[0041] like Figure 1 As shown, self-tapping screws 1 are used to fix the support 2 to the steel beam of the main structure 3. The support 2 is a special support made of aluminum alloy or stainless steel, and is arranged at the designed spacing along the length of the roof panel. The metal roof panel 4 is fastened and fixed to the support 2, and the ribs of two adjacent roof panels overlap each other to form a joint to be welded.

[0042] (ii) Arrangement of welding auxiliary equipment

[0043] The power supply and cooling unit 11 is connected to the self-propelled welding carriage 9 via a cable, and the welding carriage 9 is synchronously controlled via a data cable. The shielding gas (argon) is delivered through a gas pipe, and the laser beam is delivered via optical fiber. The wire feeder 12 is connected to the self-propelled welding carriage 9 via a data cable and feeds the welding wire to the welding carriage 9 using a wire feeding tube. All three devices (power supply and cooling unit, wire feeder, and control box) are placed on the ground or a temporary platform near the welding area.

[0044] (iii) Assembly of the welding trolley and its auxiliary components

[0045] like Figure 3 As shown, the self-propelled welding trolley 9 is placed entirely on the upper surface of the metal roof panel 4, with its wheels straddling both sides of the panel ribs. The laser 9.3 is fixed to the movable end of the height adjustment mechanism 9.2, which is mounted on the trolley frame 9.1. The laser head 5 is connected to the laser 9.3 via an optical fiber and rises and falls synchronously with the laser. The wire feed nozzle 6 is mounted on the trolley frame 9.1 and arranged adjacent to the laser head 5, with its outlet pointing towards the laser molten pool.

[0046] The height adjustment mechanism 9.2 employs a screw and nut assembly, driven by a rotating handwheel or motor, to vertically adjust the height of the laser 9.3, thereby changing the defocusing distance between the laser head 5 and the metal roof panel 4. Alternatively, the height adjustment mechanism 9.2 can also utilize a combination of bolts and slots. For example, the mechanism includes a right-angled support base with a slot on its vertical side. A bolt is installed within this slot, which can be fixedly connected to the traveling trolley frame 9.1. By adjusting the position of the traveling trolley frame 9.1 relative to the support base, the defocusing distance between the laser head 5 and the metal roof panel 4 is changed.

[0047] In this embodiment, the positive defocus is set to 3mm, that is, the laser focus is located 3mm above the plate surface.

[0048] like Figure 4 As shown, the drive wheel 10.1 and floating wheel 10.2 in the clamping drive mechanism 10 are located on both sides of the plate rib. The drive wheel 10.1 is connected to the output shaft of the motor and reducer 10.3. The floating wheel 10.2 is mounted on the traveling trolley frame 9.1 and adaptively clamps the plate rib by spring pressure. The floating wheel 10.2 is a non-powered driven wheel. The motor and reducer 10.3 are fixed on the traveling trolley frame 9.1.

[0049] The heat dissipation wheel 7 is located on the metal roof panel 4 on the opposite side (i.e., the back of the panel) opposite the laser head 5. It is connected to the traveling trolley frame 9.1 via a connecting rod, allowing the heat dissipation wheel 7 to fit snugly against the back of the roof panel and move synchronously with the trolley. The heat dissipation wheel 7 is made of copper, with a smooth outer surface and a width slightly larger than the weld seam area.

[0050] III. Preparation and Adjustment Before Welding

[0051] Before welding begins, wipe the surface of the metal roof panel 4 ribs and the area to be welded with a clean cloth to ensure there is no oil, water, or other contaminants. Adjust the installation height of the laser 9.3 using the height adjustment mechanism 9.2 according to the panel thickness and rib height, ensuring the laser head 5 is 3mm away from the panel surface (positive defocus). During height adjustment, rotate the lead screw of the height adjustment mechanism; the laser and laser head will rise or fall together, locking once the predetermined position is reached. Then, activate the clamping drive mechanism 10. The motor and reducer 10.3 drive the drive wheel 10.1 to rotate, while the floating wheel 10.2, under the action of a spring, adaptively presses against the ribs, reliably clamping the carriage onto the ribs. At this point, the friction between the drive wheel 10.1 and the floating wheel 10.2 is sufficient to support the carriage moving at a constant speed during welding.

[0052] IV. Welding Process

[0053] After the welding system is assembled and debugged, the operator inputs the welding parameters through the control system: laser power of 2000W and focal power density of 5×10⁻⁶. 5 W / cm 2 The welding speed is 7 m / min, the wire feed speed is 2.2 m / min, and the shielding gas (argon) flow rate is 18 L / min. After confirming that the parameters are correct, the self-propelled welding carriage 9 sends a welding start signal.

[0054] The power supply and cooling unit 11 starts the power supply and transmits energy to the laser 9.3 through optical fiber. The laser light generated by the laser is transmitted to the laser head 5 through optical fiber. At the same time, argon gas is continuously sprayed into the vicinity of the laser head 5 through the gas pipe, forming a stable gas shield around the molten pool and welding area. The wire feeder 12 feeds the welding wire to the wire feed nozzle 6 through the wire feed tube at a set speed. After being guided by the welding nozzle 6, the welding wire enters the front of the laser molten pool.

[0055] The high-energy-density laser beam emitted by the head 5 instantly melts the base material and welding wire, creating a keyhole effect to achieve deep penetration welding. The heat dissipation wheel 7 moves synchronously against the back of the roof panel, promptly absorbing and dissipating excess heat from the heat-affected zone of the weld to prevent the thin plate from burning through or overheating and deforming. The self-propelled welding carriage 9 moves at a constant speed along the ribs under the traction of the clamping drive mechanism 10. During the welding process, the working plane of the welding machine must always remain parallel to the ribs of the roof panel to ensure that the weld 8 is parallel to the ribs and continuous and reliable.

[0056] The entire welding process is fully automated and continuous, requiring no manual intervention. Once a section of the rib is welded, the trolley stops automatically, and the next section can be welded by removing the trolley.

[0057] V. Welding Results and Parameter Comparison

[0058] The laser seam welding system used in this embodiment produces uniform weld formation with a silvery-white metallic luster, free from oxidation, porosity, and spatter. Actual measurements show that the heat-affected zone width of laser welding is less than 0.1 mm, welding deformation (flatness) is controlled within 0.1 mm, and the weld depth-to-width ratio reaches 10:1. Tensile testing shows that the weld strength is approximately 13% higher than that of traditional resistance welding, and fatigue resistance is significantly improved.

[0059] In terms of welding speed, the welding speed of this embodiment reaches 7 m / min, which is 14 times that of the traditional resistance welding process (0.5 m / min). Since there is no need to stop the machine to clean the shavings or replace the copper ring, the effective welding length per shift (8 hours) can reach more than 300 meters, while the effective welding length per shift of traditional resistance welding is usually less than 30 meters due to frequent shaving cleaning.

[0060] In terms of environmental performance, the on-site measured smoke and dust emission concentration was about 30 mg / m³, which is far lower than the 150 mg / m³ of resistance welding. It produces almost no smoke or splash, thus improving the construction working environment.

[0061] VI. Other Alternative Implementation Methods

[0062] Those skilled in the art should understand that the specific values ​​given in the above embodiments (such as laser power, welding speed, wire feed speed, gas flow rate, etc.) can be adjusted according to the actual plate thickness, material, and working conditions. For example, for a stainless steel plate with a thickness of 0.5 mm, the laser power can be reduced to 1500 W, and the welding speed can be increased to 10 m / min; for a stainless steel plate with a thickness of 1.0 mm, the laser power can be appropriately increased to 2500 W, and the welding speed reduced to 5 m / min. The heat dissipation wheel 7 can be made of brass or copper alloys in addition to copper, but copper has the best thermal conductivity. In addition to argon, helium or an argon-helium mixture can be used as the protective gas, but argon has the lowest cost and highest density, providing the best protective effect.

[0063] In operation, the stainless steel roof laser seam welding system of this invention first fixes the support 2 to the main structure 3 using self-tapping screws 1, and then fastens the metal roof panel 4 onto the support to form the rib joint to be welded. The self-propelled welding carriage 9 straddles the rib, and the height of the laser 9.3 is adjusted by the height adjustment mechanism 9.2. The laser head 5 is connected to the laser via an optical fiber and rises and falls synchronously with it, thereby precisely setting the defocusing amount between the laser head and the plate surface. Then, the clamping drive mechanism 10 is activated: the motor and reducer 10.3 drive the drive wheel 10.1 to rotate, while the unpowered floating wheel 10.2 adaptively presses against the other side of the rib. Both clamp the rib together, and the carriage moves automatically along the rib by friction.

[0064] After welding is initiated, the power supply and cooling unit 11 delivers a high-energy-density laser beam to the laser 9.3 via optical fiber. The laser beam generated by the laser is transmitted to the laser head 5 via optical fiber, and the laser head focuses the laser beam onto the joint between the ribs of adjacent roof panels. When the focal power density reaches the preset value, the material surface rapidly heats up to its melting point and melts, forming a local molten pool. As the power density continues to increase, the material vaporizes, generating metal vapor back pressure, and a stable keyhole is formed inside the molten pool. The laser energy is absorbed multiple times by the keyhole wall, thereby achieving deep penetration welding. At the same time, the wire feeder 12 feeds welding wire to the wire feed nozzle 6 through the wire feed tube. After being guided by the welding nozzle, the welding wire enters the front of the laser molten pool and melts together with the base material to form a filler weld.

[0065] During welding, shielding gas (argon) is continuously ejected through a gas pipe, forming a stable gas shield around the molten pool and welding area. This effectively isolates oxygen and nitrogen from the air, preventing weld oxidation or porosity. A heat dissipation wheel 7, located on the back of the roof panel opposite the laser head, moves synchronously with the welding carriage. Made of copper, the heat dissipation wheel utilizes its excellent thermal conductivity to quickly absorb and dissipate excess heat from the heat-affected zone, preventing burn-through or thermal deformation of the thin plate. The entire welding process is completed automatically and continuously by a self-propelled welding carriage without manual intervention. The welding machine's working plane remains parallel to the roof panel ribs at all times, ensuring that the weld is parallel to the ribs and continuous and reliable.

[0066] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0067] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0068] In conclusion, the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stainless steel roof laser seam welding system, comprising a main structure (3), a support (2) fixed on the main structure (3), and a stainless steel roof panel (4) installed on the support (2), characterized in that: It also includes a laser head (5), which is non-contact with the stainless steel roof panel (4) and is used to move along the ribs of the stainless steel roof panel (4) and emit a laser beam to perform laser seam welding at the joints of the ribs of adjacent stainless steel roof panels.

2. The stainless steel roof laser seam welding system according to claim 1, characterized in that: It also includes a self-propelled welding trolley (9), which includes a trolley frame (9.1), a height adjustment mechanism (9.2), and a laser (9.3). The laser (9.3) is mounted on the trolley frame (9.1) and connected to the laser head (5) via an optical fiber. The height adjustment mechanism (9.2) is mounted on the trolley frame (9.1) and connected to the laser (9.3) to adjust the height of the laser (9.3). The laser head (5) moves up and down synchronously with the laser (9.3). The self-propelled welding trolley (9) is used to carry the laser (9.3) and the laser head (5) and move automatically along the rib.

3. The stainless steel roof laser seam welding system according to claim 2, characterized in that: The self-propelled welding trolley (9) further includes a clamping drive mechanism (10), which includes a drive wheel (10.1), a floating wheel (10.2), and a motor and a reducer (10.3). The drive wheel (10.1) and the floating wheel (10.2) are mounted on the walking trolley frame (9.1) and used to clamp the plate rib. The floating wheel (10.2) is a non-powered driven wheel. The motor and reducer (10.3) are fixed on the walking trolley frame (9.1) and used to drive the drive wheel (10.1) to rotate, thereby driving the self-propelled welding trolley (9) to move by friction.

4. The stainless steel roof laser seam welding system according to claim 2, characterized in that: It also includes a wire feeder (12), which is connected to a wire feed nozzle (6) via a wire feed tube. The wire feed nozzle (6) is mounted on the traveling trolley frame (9.1) and is arranged adjacent to the laser head (5) for feeding welding wire into the welding pool.

5. The stainless steel roof laser seam welding system according to claim 2, characterized in that: It also includes a protective gas supply device, which is connected to the vicinity of the laser head (5) via a gas pipe, for spraying protective gas during the welding process to form a gas shield around the molten pool and the welding area.

6. The stainless steel roof laser seam welding system according to claim 5, characterized in that: The protective gas is argon.

7. The stainless steel roof laser seam welding system according to claim 2, characterized in that: It also includes a heat dissipation wheel (7), which is disposed on the stainless steel roof panel (4) on the opposite side of the laser head (5) and is in close contact with the stainless steel roof panel (4). The heat dissipation wheel (7) is mounted on the walking trolley frame (9.1) to move synchronously with the welding process.

8. The stainless steel roof laser seam welding system according to claim 7, characterized in that: The heat sink wheel (7) is made of copper.

9. The stainless steel roof laser seam welding system according to claim 2, characterized in that: The height adjustment mechanism (9.2) is a lead screw and nut pair or an electric push rod, used to adjust the relative height between the laser (9.3) and the stainless steel roof panel (4) before or during welding.

10. The stainless steel roof laser seam welding system according to any one of claims 1 to 9, characterized in that: The laser beam emitted by the laser head (5) has a focal power density of 10. 4 Up to 10 7 W / cm 2 The welding speed is 5 to 10 m / min.

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