Submerged arc welding system

Abstract

To provide a submerged arc welding system capable of preventing overturning of a carriage.SOLUTION: A welding system A1 for performing submerged arc welding includes: a welding torch 3 for projecting the tip of a welding wire, and welding an object W to be welded; a wire feeding device 5 for feeding the welding wire; a carriage 4 which is mounted with the welding torch 3, and is moved along a welding line; and a support member 45 which extends to the welding line, and whose both ends are directly or indirectly fixed to the object W to be welded. The carriage 4 includes an insertion part 42 which has a penetration part penetrating in an extending direction of the support member 45, and where the support member 45 is inserted into the through part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a submerged arc welding system for performing submerged arc welding. [Background technology]

[0002] Submerged arc welding has been known for some time. In submerged arc welding, granular flux is spread on the workpiece, a welding wire is fed into the flux, and an arc is generated between the tip of the welding wire and the workpiece to perform welding. In submerged arc welding, welding is performed while moving the welding point by, for example, moving a carriage along the welding line. In submerged arc welding, a thick plate can be welded with high efficiency by passing a large current through a thick welding wire. Patent Document 1 discloses an example of a submerged arc welding device. In the submerged arc welding device, a wire reel wound with a welding wire, a hopper filled with flux, a welding head, and the like are mounted on a traveling carriage. The traveling carriage travels on a rail provided along the welding line. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-90410 A Summary of the Invention [Problem to be solved by the invention]

[0004] In submerged arc welding, the welding point is covered with flux. Therefore, even if the welding wire comes into contact with the workpiece and a short circuit occurs, the worker has a hard time noticing the short circuit. If the welding wire continues to be fed without noticing the short circuit, the cart may tip over.

[0005] FIG. 7 is a simplified diagram for explaining the overturning of a carriage due to a short circuit. In the welding system A100 shown in FIG. 7(a), the wire reel 6, the wire feeder 5, and the welding torch 3 are mounted on the carriage 4. This is a simplified diagram seen from the rear of the carriage 4 in the traveling direction. The tip of the welding wire fed by the wire feeder 5 protrudes from the tip of the welding torch 3 as an electrode 8, and an arc is generated between the electrode 8 and the workpiece W to perform welding. The tip of the electrode 8 is covered with flux 79. Note that FIG. 7 illustrates the electrode 8 so that it can be seen through the flux 79. Even if the tip of the welding wire (electrode 8) comes into contact with the workpiece W during welding and a short circuit occurs, it cannot actually be seen from the outside. Therefore, the operator does not notice the short circuit and does not stop welding. Therefore, the wire feeder 5 continues to feed the welding wire, and the tip of the welding wire (electrode 8) pierces the molten pool of the workpiece W.

[0006] In submerged arc welding, a welding wire with a large diameter is generally used. Therefore, the welding wire is not likely to buckle. In addition, since the wire feeder 5 is capable of feeding the welding wire with a high torque, the welding wire is not likely to slip on the pressure roll. Therefore, if the operator does not notice the occurrence of a short circuit and the feeding of the welding wire continues, a moment acts on the carriage 4 in the direction of the arrow Y around the point X as shown in FIG. 7(b). This causes the carriage 4 to become unstable and tilted, and the carriage may tip over. The tip over of the carriage is not limited to the occurrence of a short circuit during welding, but may also occur when the welding wire is continuously inched during non-welding.

[0007] The present invention has been devised in light of the above circumstances, and an object of the present invention is to provide a submerged arc welding system capable of preventing the carriage from tipping over. [Means for solving the problem]

[0008] The submerged arc welding system provided by the present invention is a submerged arc welding system for performing submerged arc welding, comprising a welding torch that protrudes a tip of a welding wire and welds the workpiece, a wire feeding device that feeds the welding wire, a cart on which the welding torch is mounted and that moves along the weld line, and a support member that extends along the weld line and has both ends fixed directly or indirectly to the workpiece, wherein the cart has a penetration portion that penetrates in the direction in which the support member extends, and has an insertion portion through which the support member is inserted into the penetration portion.

[0009] In a preferred embodiment of the present invention, the insertion portion is ring-shaped.

[0010] In a preferred embodiment of the present invention, the insertion portion includes a main body portion having an opening in a portion of the ring shape, and an opening / closing portion connected to one end of the main body portion and capable of opening and closing the opening.

[0011] In a preferred embodiment of the present invention, the insertion portion is disposed on the same side as the welding torch with respect to the carriage in a plan view, and has an open upper side.

[0012] In a preferred embodiment of the present invention, the insertion portion is disposed on the opposite side of the carriage to the welding torch in a plan view, and has an open lower side. Effect of the Invention

[0013] According to the present invention, the support member extending along the weld line is inserted into the through-hole of the insertion part of the cart. Therefore, even if the cart tilts, the support member abuts against the inner surface of the through-hole of the insertion part, so that further tilting is suppressed. Therefore, the submerged arc welding system according to the present invention can prevent the cart from tipping over. [Brief description of the drawings]

[0014] [Figure 1]FIG. 1 is a diagram for explaining a welding system according to a first embodiment, where (a) is a block diagram showing the overall configuration of the welding system, and (b) is a block diagram showing the internal configuration of a welding power supply and a control device. [Diagram 2] 1 is a simplified diagram showing an external appearance of a carriage of a welding system according to a first embodiment. [Diagram 3] FIG. 13 is a simplified diagram showing how to prevent a cart from tipping over due to a short circuit. [Figure 4] 6 is a simplified diagram showing a modified example of an insertion portion of the welding system according to the first embodiment. FIG. [Diagram 5] 13 is a simplified diagram of a carriage of a welding system according to a second embodiment, viewed from the rear in the traveling direction. FIG. [Figure 6] 13 is a simplified diagram of a carriage of a welding system according to a third embodiment, viewed from the rear in the traveling direction. [Figure 7] FIG. 11 is a simplified diagram for explaining the tipping over of a carriage due to a short circuit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0016] [First embodiment] 1 and 2 are diagrams for explaining a welding system A1 according to a first embodiment. FIG. 1(a) is a block diagram showing the overall configuration of the welding system A1. FIG. 1(b) is a block diagram showing the internal configuration of a welding power supply 2 and a control device 1. FIG. 2 is a simplified diagram showing the appearance of a cart 4, where FIG. 2(a) is a simplified diagram seen from behind in the traveling direction, and FIG. 2(b) is a simplified diagram seen from a direction perpendicular to the traveling direction and the vertical direction. In FIG. 2(b), an arrow indicates the traveling direction of the cart 4. In other words, the cart 4 moves in the direction of the arrow.

[0017] The welding system A1 is a welding system for performing submerged arc welding. The welding system A1 includes a control device 1, a welding power supply 2, a welding torch 3, a carriage 4, a wire feeder 5, a wire reel 6, a spreader 7, and an electrode 8. The welding system A1 causes the spreader 7 to spread granular flux 79 and the wire feeder 5 to feed the welding wire into the flux 79 while moving the carriage 4 along the welding line of the workpiece W (see FIG. 2) fixed to the worktable T. The welding wire is supplied from the wire reel 6. The welding power supply 2 converts AC power supplied from a commercial power supply P into power suitable for welding, outputs the power, and generates an arc between the electrode 8, which is the tip of the welding wire, and the workpiece W inside the flux 79. Welding is performed by the heat of the arc. As a result, welding is performed along the welding line of the workpiece W.

[0018] Welding torch 3 guides the welding wire fed by wire feeder 5 to the welding point. The tip of the welding wire becomes electrode 8 protruding from the tip of welding torch 3. Welding torch 3 is provided with a contact tip (not shown) that is disposed at the tip and is electrically connected to welding power supply 2. Welding power supply 2 applies a welding current to the welding wire that is in contact with the contact tip. The welding torch 3 is fixed to the cart 4 and moves with the movement of the cart 4. The welding torch 3 may be directly fixed to the cart 4, or may be indirectly fixed via an arm or the like. In this embodiment, as shown in Fig. 2, the welding torch 3 is fixed to the end of an arm extending from the cart 4 to the right front in the traveling direction.

[0019] Welding power supply 2 converts AC power supplied from commercial power source P into AC power of a desired frequency and outputs the AC power. As shown in Fig. 1(b), welding power supply 2 includes a rectifying and smoothing circuit 21, an inverter circuit 22, a transformer 23, a rectifying and smoothing circuit 24, an inverter circuit 25, a current sensor 26, a voltage sensor 27, and a control circuit 28.

[0020] The rectifying and smoothing circuit 21 converts AC power input from the commercial power source P into DC power and outputs it. The inverter circuit 22 converts the DC power input from the rectifying and smoothing circuit 21 into high-frequency power and outputs it by switching the switching elements according to an output control drive signal input from the control circuit 28. The transformer 23 transforms the high-frequency voltage output by the inverter circuit 22 and outputs it to the rectifying and smoothing circuit 24.

[0021] The rectifying and smoothing circuit 24 converts the high frequency power input from the transformer 23 into DC power and outputs it. The inverter circuit 25 converts the DC power input from the rectifying and smoothing circuit 24 into AC power and outputs it by switching the switching elements according to a switching drive signal input from the control circuit 28. The inverter circuit 25 switches between a positive polarity in which the potential of the output terminal a (connected to the workpiece W) is higher than the potential of the output terminal b (connected to the welding wire), and a reverse polarity in which the potential of the output terminal a is lower than the potential of the output terminal b.

[0022] The current sensor 26 detects the output current of the welding power supply 2, and in this embodiment, is disposed on a connection line connecting one output terminal of the inverter circuit 25 and the output terminal a. The output current of the welding power supply 2 detected by the current sensor 26 is approximately equal to the current flowing through the electrode 8. The current sensor 26 outputs a current value signal corresponding to the detected current instantaneous value to the control circuit 28 and the control device 1. The position where the current sensor 26 is disposed is not limited. The voltage sensor 27 detects the output voltage of the welding power supply 2, and in this embodiment, detects the inter-terminal voltage between the output terminal a and the output terminal b. The voltage is approximately equal to the voltage applied between the workpiece W and the tip of the electrode 8. The voltage sensor 27 outputs a voltage value signal corresponding to the detected voltage instantaneous value to the control circuit 28 and the control device 1. The voltage sensor 27 may detect the voltage between the lead wire attached to the welding torch 3 and the lead wire attached to the workpiece W.

[0023] Control circuit 28 is a circuit for controlling welding power supply 2, and is realized by, for example, a microcomputer. Control circuit 28 receives a current value signal from current sensor 26, a voltage value signal from voltage sensor 27, and various command signals and various set values ​​from control device 1. Control circuit 28 then outputs drive signals to inverter circuit 22 and inverter circuit 25. The configuration of welding power supply 2 is not limited.

[0024] The control device 1 performs various controls of the welding system A1. The control device 1 may be a general-purpose computer with a program installed therein for performing various controls of the welding system A1, or may be a dedicated device for controlling the welding system A1. The control device 1 moves the carriage 4 at a predetermined moving speed. The moving speed is set according to the material and thickness of the workpiece W. The control device 1 instructs the spraying device 7 to start and stop spraying the flux 79. The spraying device 7 may start and stop spraying the flux 79 manually. The control device 1 instructs the wire feeder 5 to start and stop feeding the welding wire and the feeding speed of the welding wire. The feeding speed is set according to the welding current to be set. The control device 1 instructs the welding power source 2 to output power.

[0025] The carriage 4 carries the wire reel 6, the wire feeder 5, the sprayer 7, and the welding torch 3 and moves along the weld line of the workpiece W. The control device 1 may also be mounted on the carriage 4. As shown in FIG. 2, the welding torch 3 and the wire feeder 5 are fixed to the end of an arm extending from the carriage 4 to the right front with respect to the traveling direction, and are disposed on the right front side of the carriage 4. Although not shown in FIG. 2, the sprayer 7 and the wire straightener are also disposed on the right side of the carriage 4. On the other hand, the wire reel 6 is fixed to the end of an arm extending from the carriage 4 to the left rear with respect to the traveling direction, and is disposed on the left rear side of the carriage 4. The positions of the parts mounted on the carriage 4 are not limited to those described above. The parts are disposed so that the center of gravity of the carriage 4 is located near the center of the carriage 4. The welding torch 3 may be configured to be movable up and down or left and right. In addition, the carriage 4 may be provided with a balancer to suppress changes in the position of the center of gravity of the carriage 4 in response to movement of the welding torch 3, or in response to a decrease in the amount of flux 79 in the hopper of the spraying device 7, or a decrease in the welding wire on the wire reel 6.

[0026] In addition, in this embodiment, the welding system A1 has a configuration for preventing the cart 4 from falling over. As shown in FIG. 2, the cart 4 has an insertion portion 42 and a fixing portion 43. The insertion portion 42 is fixed to the right side surface 41 of the cart 4 via the fixing portion 43, and is disposed on the right side of the cart 4. That is, the insertion portion 42 is disposed on the same side as the welding torch 3 with respect to the cart 4 in a plan view. The insertion portion 42 has an annular shape, and is fixed so that the axial direction is parallel to the traveling direction of the cart 4. That is, the insertion portion 42 has a through portion penetrating in the traveling direction. A support member 45, which will be described later, is inserted into the through portion. In this embodiment, the insertion portion 42 and the fixing portion 43 are so-called eye bolts (hanging bolts). That is, the bolt portion of the eye bolt is screwed into the main body portion of the cart 4 as the fixing portion 43, and the ring portion of the eye bolt is inserted into the support member 45 as the insertion portion 42. The insertion portion 42 and the fixing portion 43 are not limited to eye bolts, and the insertion portion 42 and the fixing portion 43 may be separate bodies. The dolly 4 may not include the fixing portion 43, and the insertion portion 42 may be directly fixed to the dolly 4. The shape of the insertion portion 42 is not limited as long as it has a through portion, and may be, for example, a rectangular ring shape or a cylindrical shape.

[0027] The support member 45 is a long and slender member having a certain degree of strength, and is a member capable of supporting the dolly 4 so as not to tip over. In this embodiment, the support member 45 is, for example, a wire rope. Note that the support member 45 is not limited to this, and may be a rope or a metal wire. The support member 45 may also be a member with low flexibility, such as a metal rod. However, from the viewpoint of facilitating installation, a member having a certain degree of deformation tolerance is desirable.

[0028] The support member 45 is fixed so as to extend along the weld line of the workpiece W. In this embodiment, as shown in FIG. 2(b), both ends of the support member 45 are fixed to the worktable T via the support pillars 46. The support pillars 46 are members for adjusting the height position of the support member 45 to the height position of the insertion portion 42 of the dolly 4. The support pillars 46 are rod-shaped members, one end of which is fixed to the worktable T, and the support member 45 is fixed near the other end. The support pillars 46 may be fixed directly to the workpiece W, not to the worktable T, or may be fixed to a rail for running the dolly, the ground, or a floor. When the support pillars 46 are fixed directly to the workpiece W, it is necessary to devise a method such as attaching a magnet to the support pillars 46 and fixing the support pillars 46 to the workpiece W by the magnetic force of the magnets in order to prevent scars from being left on the workpiece W. The support member 45 may be fixed directly to a wall or a pillar of a building or the like without using the support pillars 46. In this way, the method of fixing the support member 45 is not limited, and it is sufficient that both ends of the support member 45 can be fixed so that the support member 45 extends along the weld line of the workpieces W.

[0029] In this embodiment, the carriage 4 has two insertion parts 42 arranged side by side along the traveling direction. The number of insertion parts 42 is not limited, and may be one, or three or more. A support member 45 is inserted through the penetration part of each insertion part 42. This allows the carriage 4 to travel along the support member 45 and prevents the carriage 4 from tipping over due to continued feeding of the welding wire.

[0030] For example, if the tip of the welding wire (electrode 8) comes into contact with the workpiece W during welding and a short circuit occurs, the carriage 4 may tilt if the wire feeder 5 continues to feed the welding wire. At this time, since the welding torch 3 is disposed on the right side of the carriage 4, as shown in FIG. 3(a), a moment acts to rotate the carriage 4 in the direction of the arrow Y1 about the point X1, so that the carriage 4 is in an unstable state tilted to the left. However, the support member 45 abuts against the lower side of the inner surface of the penetration part of the insertion part 42, so that the carriage 4 does not tilt any further. This prevents the carriage 4 from falling over. Also, since the welding torch 3 is disposed on the front side of the carriage 4, as shown in FIG. 3(b), a moment acts to rotate the carriage 4 in the direction of the arrow Y2 about the point X2, so that the carriage 4 is in an unstable state tilted backward. However, in this case, the support member 45 abuts against the lower side of the inner surface of the penetration part of the insertion part 42 disposed in the front, so that the carriage 4 does not tilt any further. This prevents the cart 4 from tipping over.

[0031] The same applies to cases other than those caused by a short circuit during welding, such as when the welding wire is continuously inched when not welding. In this way, support member 45 and insertion portion 42 prevent cart 4 from tipping over due to continued feeding of the welding wire. Although cart 4 is prevented from tipping over, the feeding of the welding wire by wire feeder 5 needs to be stopped by an operator manually or by using another stopping mechanism.

[0032] Next, the operation and effects of the welding system A1 according to this embodiment will be described.

[0033] According to this embodiment, the carriage 4 includes an insertion portion 42 fixed to the right side surface 41. The insertion portion 42 has a through portion penetrating in the traveling direction, and a support member 45 extending along the weld line is inserted into the through portion. When the welding wire protrudes too much from the tip of the welding torch 3 and the carriage 4 tilts to the left by a predetermined amount or more, the support member 45 abuts against the inner surface of the through portion of the insertion portion 42. Therefore, the carriage 4 is prevented from tilting further. Even when the carriage 4 tilts rearward or forward by a predetermined amount or more, the support member 45 abuts against the inner surface of the through portion of the insertion portion 42, so that the carriage 4 is prevented from tilting further. This allows the welding system A1 to prevent the carriage 4 from tipping over. The present invention is particularly effective when setting conditions before the actual welding work (welding in which each parameter is changed and trial welding is performed to determine the welding conditions). Furthermore, the present invention prevents further tilting of the cart 4 when it actually tilts, and therefore can more accurately prevent the cart 4 from tipping over compared to a case in which tilting of the cart 4 is predicted and the feeding of the welding wire is stopped.

[0034] Moreover, according to this embodiment, the support member 45 is fixed so as to extend along the weld line. The insertion portion 42 is fixed to the dolly 4 and is inserted through the support member 45. Therefore, the welding system A1 is easier to carry and install than a system equipped with a large-scale mechanism for preventing tipping over. Also, the dolly 4 can be easily constructed by simply fixing the insertion portion 42 to a conventional dolly. In this embodiment, the insertion portion 42 and the fixing portion 43 are formed using a ready-made eye bolt, so that the dolly 4 can be constructed more easily.

[0035] According to the present embodiment, the insertion portion 42 is ring-shaped. Therefore, the insertion portion 42 can be prevented from coming off the support member 45.

[0036] In the present embodiment, the case where the insertion part 42 is fixed to the right side surface 41 via the fixing part 43 has been described, but the present invention is not limited to this. The insertion part 42 may be fixed to any surface of the cart 4 as long as it is disposed on the right side of the cart 4.

[0037] In this embodiment, since the welding torch 3 is disposed on the right side of the carriage 4, the insertion portion 42 is disposed on the right side of the carriage 4. When the welding torch 3 is disposed on the left side of the carriage 4, the insertion portion 42 is disposed on the left side of the carriage 4.

[0038] FIG. 4 is a simplified diagram showing a modified example of the insertion part 42 of the welding system A1 according to the first embodiment. The insertion part 42 according to the first modified example shown in FIG. 4(a) has a shape with an open upper side of an annular shape. In this modified example, when the cart 4 tilts to the left, the support member 45 abuts on the lower side of the inner surface of the penetration part of the insertion part 42, thereby preventing the cart 4 from falling over. In addition, since the insertion part 42 has a shape with a part open, it is easy to attach it to the support member 45. The insertion part 42 according to the second modified example shown in FIG. 4(b) includes a main body part 42a and an opening / closing part 42b. The main body part 42a has an opening part with an open upper side of the annular shape. The opening / closing part 42b is connected to one end of the main body part 42a and is configured to be able to open and close the opening part. The insertion part 42 can be easily attached to the support member 45 by pressing the opening / closing part 42b downward to open the opening part. After attachment, opening / closing portion 42b can be returned to its original position to close the opening, thereby preventing insertion portion 42 from coming off support member 45. Main body portion 42a may have an opening on the lower side or right side of the ring shape.

[0039] Second Embodiment Fig. 5 is a diagram for explaining a welding system A2 according to a second embodiment, and is a simplified diagram of a carriage 4 of the welding system A2 as viewed from the rear in the traveling direction. In Fig. 5, elements that are the same as or similar to those in the first embodiment are given the same reference numerals as those in the first embodiment. The welding system A2 according to this embodiment differs from the welding system A1 according to the first embodiment in the arrangement position and shape of the insertion portion 42.

[0040] In this embodiment, the insertion part 42 is fixed to a left side surface 44 of the carriage 4 via a fixing part 43, and is disposed on the left side of the carriage 4. That is, the insertion part 42 is disposed on the opposite side of the carriage 4 from the welding torch 3 in a plan view. The insertion part 42 has a circular ring shape with an open lower side. As shown in FIG. 5(b), when the carriage 4 is tilted to the left by a predetermined amount or more, the support member 45 comes into contact with the upper side of the inner surface of the penetration part of the insertion part 42, and the carriage 4 does not tilt any further. This prevents the carriage 4 from falling over. The insertion part 42 may be circular ring shaped.

[0041] According to this embodiment, the cart 4 has an insertion part 42 fixed to the left side surface 44. The insertion part 42 has a through-hole that penetrates in the traveling direction, and a support member 45 extending along the welding line is inserted into the through-hole. When the welding wire protrudes too much from the tip of the welding torch 3 and the cart 4 tilts to the left by more than a certain amount, the support member 45 abuts against the upper side of the inner surface of the through-hole of the insertion part 42. Therefore, the cart 4 is prevented from tilting further. This allows the welding system A2 to prevent the cart 4 from tipping over. Also, in this embodiment, the welding system A2 has a configuration similar to that of the welding system A1, and can therefore achieve the same effects as those of the welding system A1.

[0042] In this embodiment, since the welding torch 3 is disposed on the right side of the carriage 4, the insertion portion 42 is disposed on the right side of the carriage 4. When the welding torch 3 is disposed on the left side of the carriage 4, the insertion portion 42 is disposed on the left side of the carriage 4.

[0043] The dolly 4 may also have an insertion part 42 and a support member 45 on both the left and right sides. That is, the dolly 4 may have both an insertion part 42 fixed to the left side surface 44 and having a support member 45 arranged on the left side of the dolly 4 inserted therethrough, and an insertion part 42 fixed to the right side surface 41 and having a support member 45 arranged on the right side of the dolly 4 inserted therethrough. In this case, the insertion part 42 arranged on the left side may have a ring shape or a ring shape with an open lower side, and the insertion part 42 arranged on the right side may have a ring shape or a ring shape with an open upper side.

[0044] Third Embodiment Fig. 6 is a diagram for explaining a welding system A3 according to a third embodiment, and is a simplified diagram of the carriage 4 of the welding system A3 as viewed from the rear in the traveling direction. In Fig. 6, elements that are the same as or similar to those in the first embodiment are given the same reference numerals as those in the first embodiment. The welding system A3 according to this embodiment differs from the welding system A1 according to the first embodiment in that a support member 45 is inserted into a through hole that penetrates the body of the carriage 4.

[0045] In this embodiment, the dolly 4 does not have the insertion portion 42 and the fixing portion 43 as in the first and second embodiments, but instead has a through hole 4a that penetrates the body of the dolly 4 in the front-rear direction (traveling direction). In this embodiment, the through hole 4a is disposed to the right of the center of gravity of the dolly 4. The position of the through hole 4a is not limited. A support member 45 is inserted through the through hole 4a. In other words, the through hole 4a according to this embodiment corresponds to the penetration portion of the insertion portion 42 according to the first and second embodiments.

[0046] According to this embodiment, the cart 4 has a through hole 4a that penetrates the main body in the front-rear direction (traveling direction). A support member 45 extending along the weld line is inserted into the through hole 4a. When the welding wire protrudes too much from the tip of the welding torch 3 and the cart 4 tilts to the left by more than a certain amount, the support member 45 abuts against the lower side of the inner surface of the through hole 4a. Therefore, the cart 4 is prevented from tilting further. This allows the welding system A3 to prevent the cart 4 from tipping over. Also in this embodiment, the welding system A3 has a similar configuration to the welding system A1, and can therefore achieve the same effects as the welding system A1.

[0047] The submerged arc welding system according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the submerged arc welding system according to the present invention can be freely designed in various ways. [Explanation of symbols]

[0048] A1 to A3: welding system, 3: welding torch, 4: cart, 42: insertion part, 42a: main body, 42b: opening / closing part, 45: support member, 5: wire feeder

Claims

1. 1. A submerged arc welding system for performing submerged arc welding, comprising: A welding torch that projects a tip of a welding wire and welds an object to be welded; a wire feeder that feeds the welding wire; A carriage on which the welding torch is mounted and which moves along the weld line; A support member extending along the weld line and having both ends fixed directly or indirectly to the workpiece; Equipped with The carriage has a through-hole that penetrates in a direction in which the support member extends, and includes an insertion portion through which the support member is inserted into the through-hole. Submerged arc welding system.

2. The insertion portion is ring-shaped.

2. The submerged arc welding system of claim 1.

3. The insertion portion includes a main body portion having an opening in a part of a ring shape, and an opening / closing portion connected to one end of the main body portion and capable of opening and closing the opening.

2. The submerged arc welding system of claim 1.

4. The insertion portion is disposed on the same side as the welding torch with respect to the carriage in a plan view, and has an open upper side.

2. The submerged arc welding system of claim 1.

5. The insertion portion is disposed on the opposite side of the carriage from the welding torch in a plan view, and has an open lower side.

2. The submerged arc welding system of claim 1.

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