JP7389013B2 - Sliding copper pad for welding, welding equipment and welding method - Google Patents

Description

The present invention relates to a sliding copper pad for welding, a welding device, and a welding method.

Vertical advancement welding methods such as electroslag welding and electrogas arc welding are widely used in shipbuilding and welding large structures such as oil tanks as highly efficient construction methods for vertical joints.

In particular, electroslag welding, which uses the Joule heat of molten slag as a heat source, generates heat within the molten slag rather than through an exposed arc to melt the wire and base metal, so arc radiant heat is not generated, and fumes and There is also less spatter, which improves the working environment. In addition, since the weld metal is shielded from the atmosphere with molten slag, shielding gas is not required, and the shielding effect does not deteriorate even when the plate thickness increases, preventing nitrogen and other substances present in the atmosphere from entering the molten metal. Since it can be effectively prevented regardless of the thickness, there is an advantage that mechanical deterioration of the weld metal does not occur.

Furthermore, it is known that both the electroslag welding method and the electrogas arc welding method use a small water-cooled sliding copper pad having a length that can cover the molten slag bath or molten metal bath. . As welding progresses, the welding torch and truck are raised using rails, chains, etc., and the water-cooled sliding copper pad is moved along the welding line along with the torch and truck, making it possible to perform long welds of several tens of meters. It is said that

In Patent Document 1, in vertical electrogas arc welding in which a sliding copper pad is brought into contact with the groove surface of the workpiece and welded, when welding is performed while pressing the sliding copper pad in the plate thickness direction, the sliding The pressure applied to the lower part of the copper pad is set to 1/4 to 1/2 of the pressure applied to the center, and even in joints where serpin processing is applied to base metals with different thicknesses in the direction of the weld line, melting can be prevented. Preventing metal and molten slag leakage is disclosed. Specifically, when the sliding copper pad passes through the end face of the serpin-processed part of the upper base material and becomes perpendicular to the surface of the upper base material, the gap between the molten metal and the sliding copper pad This prevents weld metal and molten slag from leaking through the gaps created in the

Further, in Patent Document 2, in order to perform welding while maintaining the depth of the slag bath at a predetermined depth in electroslag welding, a molten slag bath detector is installed on the top of a sliding copper pad, It is described that the depth of the slag bath is detected according to the welding voltage detected by a detection terminal of a molten slag bath detector.

Japanese Patent Application Publication No. 2003-236667 Japanese Patent Application Publication No. 2016-215214

FIG. 19 shows a process of welding a serpin-processed portion 3S of a base material 3 having a difference in plate thickness in the welding line direction using a sliding copper pad 200 in the conventional electroslag welding method. When the sliding copper pad 200 advances from the lower base material 3D to the serpin-processed part 3S of the upper base material 3U, the upper end of the sliding copper pad 200 rises along the serpin-processed part 3S (see FIG. 19). b)), a gap S1 is created between the sliding copper pad 200 and the base material 3. As the welding progresses further and the sliding copper pad 200 becomes parallel to the serpin processed portion 3S (see FIG. 19(c)), a gap S2 is created between the top of the sliding copper pad 200 and the upper base material 3U. arise. For this reason, there is a concern that molten slag or molten metal may leak from the gaps S1 and S2 and welding may be interrupted, and improvements have been sought. On the other hand, when the sliding copper pad 200 is in a state along the surface of the upper base material 3U (see FIG. 19(d)), a gap S3 is created between the lower part of the sliding copper pad 200 and the serpin processing part 3S. However, if the molten slag or weld metal has already solidified, no leakage of the molten slag or weld metal will occur.

The method described in Patent Document 1 aims to prevent leakage of molten metal and molten slag from the gap S3 in the state shown in FIG. 19(d), and the method described in FIG. 19(b) and FIG. 19(c) In this state, leakage of molten slag and weld metal from the voids S1 and S2 is not taken into consideration.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a welding sliding device that can prevent leakage of molten slag or molten metal even in joints where plate thicknesses differ in the direction of the weld line. An object of the present invention is to provide a copper pad, a welding device, and a welding method.

The above object of the present invention is achieved by the following configuration.
[1] A sliding copper pad for welding that is arranged to face a groove between a pair of base materials and slides along the groove so as to form a molten slag bath or a molten metal bath,
A padding body,
at least one follower member that is provided on at least one side of the pad main body and is movable so that its end facing the base material comes into contact with or comes close to the base material;
A sliding copper pad for welding.

[2] The sliding copper pad for welding according to [1],
welding torch and
a molten slag bath detector that detects a slag bath height of the molten slag bath or the molten metal bath;
a flux supply device that supplies flux to the molten slag bath or the molten metal bath;
a traveling carriage that carries the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moves along the groove;
Equipped with
Welding equipment.
[3] Place the sliding copper pad for welding according to [1] toward the groove between the pair of base materials,
Filling the groove with flux and supplying a welding wire from the tip of the contact tip,
Welding is performed by moving the contact tip along the groove and slidingly moving the welding sliding copper pad along the groove.
Welding method.

According to the sliding copper pad for welding, the welding device, and the welding method of the present invention, the end portion facing the base material is in contact with or close to the base material on at least one side of the pad body. Since at least one movable follower member is provided, leakage of molten slag or weld metal can be prevented even in a joint portion where the plate thicknesses differ in the weld line direction.

1 is a diagram showing a schematic configuration of an electroslag welding device according to an embodiment of the present invention. FIG. 2 is a perspective view of the sliding copper pad for welding according to the first embodiment, seen from the back side. FIG. 3 is a perspective view of the sliding copper pad for welding shown in FIG. 2, viewed from the front side. FIG. 3 is a front view of the front side of the sliding copper pad for welding shown in FIG. 2; FIG. 3 is a top view of the sliding copper pad for welding shown in FIG. 2; 6 is a sectional view taken along the line VI-VI in FIG. 5. FIG. FIG. 3 is a partially cutaway side view of the slag leakage prevention portion of the sliding copper pad for welding shown in FIG. 2; It is a sectional view showing the state where a copper pad and a sliding copper pad for welding are arranged in a groove part of a butt joint. It is a sectional view showing a state where a copper pad and a sliding copper pad for welding are arranged on the surface of a base material having an angle. FIG. 3 is a side view showing a process of welding joint parts having different plate thicknesses in the welding line direction using the sliding copper welding metal fitting of the first embodiment. It is a figure showing an example of composition of a molten slag bath detector. It is a perspective view which shows the sliding copper pad for welding in the state where the detection terminal was removed from the pad main body part. It is a perspective view of the sliding copper pad for welding of a 2nd embodiment seen from the back side. FIG. 14 is a perspective view of a slag leak prevention portion of the sliding copper pad for welding shown in FIG. 13; 14 is an enlarged top view of the slag leakage prevention part of the sliding copper pad for welding shown in FIG. 13. FIG. FIG. 7 is a side view showing a process of welding joint portions having different plate thicknesses in the welding line direction using a sliding copper welding pad according to the second embodiment. It is a front schematic diagram which shows various modifications of the sliding copper pad for welding of 1st Embodiment. It is a front schematic diagram which shows various modification examples of the sliding copper pad for welding. FIG. 3 is a side view showing a process of welding joint parts having different plate thicknesses in the welding line direction using a conventional sliding copper welding metal fitting.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the sliding copper pad for welding, a welding device and a welding method using the sliding copper pad for welding according to the present invention will be described in detail based on the drawings. Although the sliding copper pad for welding according to the present invention is applicable to both electroslag welding and electrogas arc welding, the following description will be made using electroslag welding as an example.

<Configuration of welding equipment>
First, an electroslag welding apparatus using a sliding copper pad for welding according to an embodiment of the present invention will be described. FIG. 1 is a diagram showing a schematic configuration of an electroslag welding apparatus according to an embodiment of the present invention.

As shown in FIG. 1, the arrow Z is the direction along the welding line of the base metal (vertical direction), the arrow X is the direction of the thickness of the base metal, and the arrow Y is the direction in which the pair of base metals are lined up. That is, the direction is horizontal along the surface of the base material. Therefore, upper means upper side with respect to the paper surface of FIG. 1, lower side means lower side with respect to the paper surface of FIG. 1, front means left side with respect to the paper surface of FIG. On the right side. Also, in FIG. 2, assuming that the sliding copper dot for welding is placed on the surface of the base material, arrow Z indicates the longitudinal direction of the sliding copper dot for welding (the longitudinal direction of the welding body). direction), arrow width direction).

As shown in FIG. 1, an electroslag welding apparatus 100 according to the present embodiment includes a fixed copper pad 1, a sliding copper pad 30 for welding, a welding torch 4, a molten slag bath detector 13, and a flux It includes a supply device 14, a flux supply control device 15, a traveling truck 16, and a traveling truck control device 17.

In the electroslag welding apparatus 100, a fixed copper pad 1 is arranged on the back side of the groove of a pair of base materials 3, which are steel plates, and a sliding copper pad 30 for welding is arranged on the front side of the groove. be done. Here, instead of the copper pad 1 on the back side, a backing material made of heat-resistant ceramics may be used. Moreover, the sliding copper pad 30 for welding on the front side is a copper pad that slides in the vertical direction, and is water-cooled as described later. However, the material of the sliding copper pad 30 for welding may be substituted with a material other than copper.

The welding torch 4 welds the base metal 3 by feeding the welding wire 6 with a welding current 8 supplied from a welding power source (not shown). The welding torch 4 also has a contact tip 5 that guides a welding wire 6 and supplies a welding current 8 to the welding wire 6.

Molten slag bath detector 13 detects the position of molten slag bath 7 . Flux supply device 14 supplies flux 12 to molten slag bath 7 . Since the flux 12 melts into molten slag, the amount of the molten slag bath 7 increases by adding the flux 12.

Flux supply control device 15 controls the operation of flux supply device 14 and adjusts the amount of flux 12 introduced into molten slag bath 7 .

The traveling truck 16 is equipped with a sliding copper pad for welding 30, a welding torch 4, a molten slag bath detector 13, a flux supply device 14, a flux supply control device 15, and a traveling truck control device 17. move in the direction of arrow Z). That is, the traveling truck 16 moves together with the welding sliding copper pad 30, the welding torch 4, the molten slag bath detector 13, the flux supply device 14, the flux supply control device 15, and the traveling truck control device 17. Therefore, their relative positions remain unchanged. As the traveling carriage 16 rises, welding is performed in the upward direction.

The traveling truck control device 17 controls the operation of the traveling truck 16 by increasing or decreasing the traveling speed of the traveling truck 16.

Then, a welding wire 6 is fed from the tip of the contact tip 5 of the welding torch 4 into the groove surrounded by the base metal 3, the copper pad 1, and the sliding copper pad 30 for welding. It is fed into the formed molten slag bath 7. Welding current 8 flows from welding wire 6 through molten slag bath 7 to molten metal 9 . At this time, Joule heat is generated due to the welding current 8 flowing through the molten slag bath 7 and the resistance of the molten slag bath 7, and welding progresses while melting the welding wire 6 and the base metal 3.

As the welding progresses, the molten metal 9 is cooled to become the weld metal 10, and a portion of the molten slag bath 7 flows between the copper pad 1 and the weld metal 10 and between the welding sliding copper pad 30 and the weld metal 10. A molten slag layer is formed between the metal 10 and the molten slag layer, which is cooled and becomes a solidified slag 11. In this way, a portion of the molten slag bath 7 becomes solidified slag 11 that covers the bead surface, so that it is consumed as welding progresses, and the depth Ls of the molten slag bath 7 decreases. In order to compensate for this decrease in the molten slag bath 7, it is necessary to add additional flux 12 which will be melted and become the molten slag bath 7.

The amount of solidified slag 11 covering the bead surface varies depending on the bead width and the width of the welding groove. Further, the amount of solidified slag 11 varies depending on the degree of adhesion between the copper pad 1 and the sliding copper pad 30 for welding and the cooling state. Therefore, the amount of solidified slag 11 is not constant, and in order to keep the depth Ls of molten slag bath 7 constant, it is necessary to change the amount of flux 12 to be added. However, since the depth Ls of the molten slag bath 7 is unknown, if the amount of flux 12 introduced is not appropriate, the depth Ls of the molten slag bath 7 will vary.

Therefore, in this embodiment, control is performed to keep the depth Ls of the molten slag bath 7 constant. Here, "constant" does not mean that the depth Ls of the molten slag bath 7 always takes one value, but also when the depth Ls of the molten slag bath 7 shows a value within a certain range in consideration of errors. Also included. That is, the depth Ls of the molten slag bath 7 is controlled to be maintained at a predetermined depth.

The first requirement for keeping the depth Ls of the molten slag bath 7 constant is that the welding wire length Ld from the tip of the contact tip 5 to the top surface of the molten slag bath 7 (hereinafter referred to as dry extension Ld) is It is controlled to have a predetermined length. Further, the second requirement for keeping the depth Ls of the molten slag bath 7 constant is a predetermined relationship between the welding current 8 and the reference current value determined according to the wire feeding speed, that is, the reference The traveling vehicle control device 17 controls the traveling speed of the traveling vehicle 16 so that the current value and the welding current 8 become equal. At the same wire feeding speed, there is a correlation between (Ld+Ls) and the welding current 8, and the traveling truck control device 17 controls the traveling speed of the traveling truck 16 so that the reference current value and the welding current 8 are equal. Then, (Ld+Ls) is kept constant.
The welding wire length Ld can be controlled by detecting the molten slag bath 7 with the molten slag bath detector 13, which will be described in detail later.

<Sliding copper pad for welding>
As shown in FIGS. 2 to 7, the sliding copper pad for welding 30 includes a pad body portion 40 having a base portion 41 and a pair of rotating members 31, 31 rotatably held by the base portion 41; A pair of slag leak prevention parts 60 are provided on both sides of the pad body part 40 to prevent leakage of molten slag or molten metal at joint parts where the plate thicknesses differ in the welding line direction.

The base 41 of the pad main body 40 is formed into a substantially rectangular plate shape, and a pair of arcuate holes 42 that open on the side facing the base material 3 and on the side in the width direction are provided at both ends in the width direction. It is formed at both ends in the direction (Z direction).

The opposing surface 41a of the base 41 between the pair of arcuate holes 42 is a recess 43 that is slightly recessed at the center in the width direction. A detection terminal 18 of a molten slag bath detector 13, which will be described later, is arranged above the recess 43. Inside the base 41 of the pad body 40, a pair of blind holes 44 are formed from the lower end on the widthwise inner side of the pair of arcuate holes 42 and are substantially parallel to each other in the Z direction. The open end of the blind hole 44 is sealed with a stopper (not shown).

Furthermore, a pair of through holes 45 are formed in the lower part of each blind hole 44, communicating with the blind hole 44 from the opposite side of the recess 43 (see FIGS. 8 and 9). Furthermore, the upper part of each blind hole 44 is communicated with each other by a communication hole 45A extending in the width direction (see FIG. 4). The blind hole 44, the pair of through holes 45, and the communication hole 45A form part of a water cooling path 38 through which cooling water, which will be described later, flows.

The pair of rotating members 31 are substantially cylindrical members having a substantially fan-shaped cross section, and have two flat contact surfaces 32 and a mounting surface 33 that are partially cut out from their outer peripheral surfaces and extend in the longitudinal direction. The two contact surfaces 32 and the attached surface 33 are formed parallel to the axis CL of the rotating member 31 and are orthogonal to each other. The width of the contact surface 32 is, for example, 5 to 15 mm. As shown in FIG. 6, small-diameter support shafts 34 are formed at both axial ends of the rotating member 31, and are rotatably fitted into sliding bearings 39 screwed to the base 41 of the pad body 40. match. The sliding bearing 39 has a generally fan-shaped outer shape, and two flat parts 39a and 39b are provided on a part of the outer diameter surface, corresponding to the contact surface 32 and the mounting surface 33 (see FIG. 3).

Further, a blind hole 35 is formed in the interior of the rotating member 31 in the axial direction from one end side (lower end in FIG. 6). A stopper 36 is fixed to a female thread 35a formed at the open end of the blind hole 35 to seal the blind hole 35. Further, the blind hole 35 is provided with a pair of through holes 37 that communicate with the blind hole 35 from the opposite side of the contact surface 32 in the radial direction. The blind hole 35 and the pair of through holes 37 form part of a water cooling path 38 through which cooling water for cooling the rotating member 31 flows.

Note that the blind hole 35 of the rotating member 31, the pair of through holes 37, and the blind hole 44, the pair of through holes 45, and the communication hole 45A of the base 41 are connected to one by a connecting pipe 50 (see FIG. 2). A water cooling path 38 is formed. By cooling the rotating member 31, the pad body 40, and the slag leak prevention part 60 through the water cooling path 38, the molten slag or molten metal is solidified, and the molten slag or molten metal is connected to the base material 3 and the sliding copper for welding. To suppress leakage from between the pads 30.

Here, as shown in FIG. 5, the length L1 of a perpendicular line from the center O of the rotating member 31 to the contact surface 32 is from the center O of the arcuate hole 42 of the base 41 (same as the center O of the rotating member 31) to the base. The length of the perpendicular to the front end surface 41c of the facing surface 41a other than the recessed portion 43 is set to be longer than the length L2 (L1>L2).

Therefore, the pair of rotating members 31 whose supporting shaft portions 34 at both ends in the axial direction fit into the sliding bearings 39 and are rotatably fitted into the arcuate hole 42 of the base 41 have their contact surfaces 32 connected to the base 41. It is assembled with L1-L2 protruding from the front end surface 41c. That is, the pair of rotating members 31 are supported by the pad body 40 such that their contact surfaces 32 protrude from the facing surface 41a of the base 41 toward the base material 3 by L1-L2.

Further, as shown in FIG. 6, in the slide bearing 39 having a substantially D-shaped outer shape, the length L3 of a perpendicular line from the center O of the rotating member 31 (same as the center of the support hole of the slide bearing 39) to the plane portion 39a is as follows. It is the same as the length L2 of a perpendicular line from the center O of the arcuate hole 42 of the base 41 to the front end surface 41c. Therefore, the flat portion 39a of the slide bearing 39 does not protrude from the facing surface 41a of the base portion 41.

As shown in FIGS. 2 to 5 and 7, the slag leakage prevention parts 60 include a plurality of substantially rectangular parallelepipeds (in the illustrated embodiment Here, the plurality of blocks 64 are supported via the plurality of support shafts 66, the plurality of support shafts 66 each having one end attached to the opposite side of the end 64a of the plurality of blocks 64, and the plurality of blocks 64. A plurality of attachments, such as coil springs, contact the support block 62 and a head 66a formed at the other end of the support shaft 66, and press the plurality of blocks 64 in a direction in which they come into contact with or approach the base material 3. It includes a biasing member 63 and a cover 65 that supports the ends of the plurality of biasing members 63 and is attached to the support block 62.

The support block 62 is formed to be elongated to match the total length of the plurality of blocks 64 in the vertical direction (Z direction in FIG. It is fixed to the mounting surface 33 with screws. In addition, the support block 62 has a plurality of support holes 67 corresponding to the number of blocks 64 that penetrate in the thickness direction of the sliding copper pad 30 for welding and into which each support shaft 66 is slidably fitted. They are formed in line in the longitudinal direction of the sliding copper pads 30 for welding.

Therefore, each biasing member 63 whose end portion on the side opposite to the base material is supported by the cover 65 biases each block 64 via the support shaft 66, and in the normal state, the end portion 64a of each block 64 is The contact surface 32, which is the contact surface of the rotating member 31, protrudes toward the base material 3.

In this way, each block 64 is pressed in the direction of contacting or approaching the base material 3 by the elastic force of the biasing member 63, so that the sliding copper pad 30 for welding When placed on the front side, the end 64a of each block 64 facing the base material 3 is in contact with the base material 3, or the head 66a of the support shaft 66 is in contact with the support block 62. , located close to the base material 3. Furthermore, by sliding the welding sliding copper pad 30 along the welding line direction, each block 64 follows the surface shape of the base material 3 and is perpendicular to the longitudinal direction of the pad main body 40. move in the thickness direction (X direction).

That is, the plurality of blocks 64 constitute a follower member of the present invention that is movable so that the end portion 64a facing the base material 3 comes into contact with or approaches the base material 3. Further, the plurality of blocks 64 constitute a movable member 61 that can move toward or away from the base material 3 . That is, in this embodiment, the ends 64a of the plurality of blocks 64 constitute the ends of the following member and the end of the movable member 61 of the present invention.
Further, the support block 62 and cover 65 of this embodiment constitute a support section of the present invention that supports the movable member 61.

Note that the movable member 61 may be composed of a single member as long as it functions as the following member and is movable in a direction toward or away from the base material 3; By dividing the movable member 61 into a plurality of blocks 64, the gap between the base material 3 and the movable member 61 can be made smaller when passing through joints with different plate thicknesses in the vertical direction, and the molten slag can be Leakage can be more reliably prevented.
In addition, in this embodiment, the plurality of blocks 64 move in the thickness direction perpendicular to the longitudinal direction of the pad body 40, but if the blocks 64 move in the direction approaching or away from the base material 3, , may be moved in an oblique direction including an X-direction component or a Y-direction component.

Further, the plurality of blocks 64, the support shaft 66, and the support block 62 are made of a metal material with good heat conductivity (in this embodiment, the material of the blocks 64 and the support block 62 is copper, and the material of the support shaft 66 is stainless steel). Since the support block 62 is attached in contact with the rotating member 31 having the water cooling path 38, the slag leakage prevention part 60 can be cooled by the pad body part 40.
Although it is desirable to directly cool the slag leakage prevention section 60, there is no space in the slag leakage prevention section 60, and it is difficult to install the water cooling path 38 therein. Therefore, in order to further enhance the cooling effect, it is preferable that the water cooling path 38 be installed at a location close to the slag leakage prevention section 60 of the pad main body section 40.

Further, the pressing force on the block 64 is not limited to the elastic force of the biasing member 63, but may be gravity, magnetic force, axial force, or air pressure, and furthermore, it can be pressed manually. When pressing the block 64 by gravity, magnetic force, or the like other than the biasing member 63, an appropriate mechanism can be employed.

Further, the block 64 has a predetermined width (in the Y direction in FIG. 5) and a predetermined thickness (in the X direction in FIG. 5). Since the block 64 has a predetermined width and a predetermined thickness, sufficient cooling performance for cooling the molten slag faster can be obtained. For example, the width is preferably 5 mm or more, and the thickness is preferably 4 mm or more. The upper limits of the width and thickness are not particularly limited, but if they are too large, it will become heavy and the driving force for moving the sliding copper pad 30 for welding along the groove will become large, so the width should be 15 mm or less, and the thickness should be 15 mm or less. is preferably 10 mm or less.

Further, the upper end 61b of the movable member 61, that is, the upper end 64b of the upper block 64, is located above the molten slag bath 7, and the lower end 61c of the movable member 61, that is, the lower end of the lower block 64 is located above the molten slag bath 7. 64c is located above the lower end 41b of the pad body 40. Thereby, molten slag can be prevented from leaking out between the base metal 3 and the sliding copper welding pad 30 over the entire length of the pad main body portion 40 in the Z direction.
Here, the position of the molten slag bath 7 will be explained. When detecting the height of the molten slag bath 7 and automatically controlling the height of the molten slag bath 7, it is necessary to If the height of the molten slag bath 7 is not automatically controlled, it means the position of the upper surface of the molten slag bath 7 that has been determined in advance by the welding operator as a target.
As shown in FIG. 4, in this embodiment, the upper end 64b of the movable member 61 is located below the upper end of the contact surface of the pad body 40, that is, the upper end 39c of the upper sliding bearing 39. However, the lower end 64c of the movable member 61 is located above the lower end of the contact surface of the pad body 40, that is, the lower end 39d of the lower sliding bearing 39.

<Function of sliding copper pad for welding>
Next, welding using the sliding copper pad 30 for welding will be explained with reference to FIGS. 8 to 10.

First, a case will be described in which base materials 3 having different plate thicknesses in the left and right directions are welded.
Since the pair of rotating members 31 are rotatable relative to the base 41 of the pad body 40, each contact surface 32 of the pair of rotating members 31 rotates following the surface 3a of the base material 3, and Even if there is an angle difference between the surfaces 3a of the material 3 (see Fig. 9), or even if there is a difference in thickness in the left and right direction between the surfaces 3a of the two base materials 3, the rotation of the surface 3a of the base materials 3 and the pair The contact surface 32 of the member 31 is in reliable surface contact.

As a result, the copper pad 1, the groove 2 of the base material 3, a part of the surface 3a of the base material 3, a part of the cylindrical surface of the rotating member 31, and the recess 43 (opposed surface 41a) of the base 41 form an image. A molten slag storage portion is formed.

In this way, the pair of rotating members 31 are arranged with their contact surfaces 32 in surface contact with the surface 3a of the base material 3, and cooling water is flowed into the water cooling path 38 to cool the rotating members 31 and the base 41 from the inside. While cooling, the groove 2 is filled with flux 12, the welding wire 6 is supplied from the tip of the contact tip 5, the contact tip 5 is moved along the groove 2, and a sliding copper pad for welding is applied. 30 is slid along the groove portion 2 to perform welding.

The contact surfaces 32 of the pair of rotating members 31 are in surface contact with the surface 3a of the base material 3, so even if there is a difference in thickness or angle between the two base materials 3 in the left and right direction, the molten slag will It is possible to reliably prevent leakage from between the base material 3 and the contact surfaces 32 of the pair of rotating members 31. Furthermore, a long welding part can be welded using the small and lightweight sliding copper welding pad 30.

Next, as shown in FIG. 10, a case will be described in which base materials 3D and 3U having different plate thicknesses in the welding line direction (vertical direction), that is, different plate thicknesses and having serpin processed portions 3S are welded. When base materials 3D and 3U having different thicknesses are welded, a gap is created between the surface 3a of the base metals 3D and 3U and the sliding copper pad 30 for welding in the serpin processing part 3S, and molten slag leaks from the gap. There is a possibility that it will come out.

The sliding copper pad 30 for welding is arranged so that the contact surfaces 32 of the pair of rotating members 31 are brought into contact with the surface 3a of the lower base material 3D on which the copper pad 1 is disposed on the back surface. At this time, as shown in FIG. 10(a), each block 64 that protrudes from the support block 62 toward the base material due to the elastic force of the biasing member 63 has its end 64a in contact with the surface 3a of the base material 3D. By contacting the base material 3D, it is pushed against the elastic force of the biasing member 63, follows the surface shape of the base material 3D, and is arranged with no gap between the base material 3D and the base material 3D. Therefore, even if welding is performed in this state, molten slag or molten metal will not leak out from the gap between the end 64a of the block 64 and the surface 3a of the base material 3D.

As welding progresses along the welding line, the upper end of the sliding copper pad 30 for welding reaches the serpin processed portion 3S, as shown in FIG. 10(b). At this time, although there is a difference in thickness between the lower base material 3D and the upper base material 3U, each block 64 contacts or approaches the base material 3 following the shape of the serpin processing part 3S. By moving in this manner, the gap between the serpin processing portion 3S and the end portion 64a of each block 64 is closed. Thereafter, as shown in FIGS. 8(c) and 8(d), the gap generated between the base material 3 including the serpin processed part 3S and the block 64 of the sliding copper pad 30 for welding becomes the slag leakage prevention part. 60, and the base material 3 having different plate thicknesses in the vertical direction can be welded satisfactorily by preventing leakage of molten slag or molten metal.

<Configuration of molten slag bath detector>
Next, the configuration of the molten slag bath detector 13 will be explained in detail. FIG. 11 is a diagram showing an example of the configuration of the molten slag bath detector 13.

As shown in FIG. 11, the molten slag bath detector 13 includes a detection terminal 18, a differential amplifier 19, a contact determination reference signal setter 20, and a comparator 21. The detection terminal 18 is made of a copper alloy which is a conductive metal. When the detection terminal 18 comes into contact with the molten slag bath 7, it detects a part of the welding voltage.
Note that the differential amplifier 19 of the molten slag bath detector 13 may input the voltage of the detection terminal 18 and the voltage of the sliding copper pad for welding 30, which is the base metal voltage; Since the pad 30 is in contact with the molten slag bath 7 and may have a ground potential, it is better to ground it as shown in FIG. 11 rather than inputting the voltage of the sliding copper pad 30 for welding. is preferred.

As shown in FIG. 12, the detection terminal 18 has a substantially rectangular parallelepiped shape with flanges 18c extending on both sides in the width direction on the upper surface, and is in contact with the pad body 40 over a large area via an insulating member 48. . Specifically, the detection terminal 18 is formed by inserting an insulating member such as ceramic into a groove 47 having a rectangular U-shaped cross section and penetrating in the thickness direction (X direction) formed in the upper part of the base 41 of the metal fitting body 40. It is fitted through 48. Further, as shown in FIG. 5, the rectangular surface 18a of the detection terminal 18 on the base material 3 side is located at approximately the same position as the deepest part of the recess 43 of the base 41 in the thickness direction, and is insulated. The groove 47 is formed flat over the entire opening on the base material 3 side with the member 48 interposed therebetween.
Note that the detection terminal 18 is attached to the pad body 40 by a support 49 bolted to the base 41 in a manner that is insulated from the base 41 .

Therefore, the detection terminal 18 is indirectly cooled by the water-cooled pad body 40 via the insulating member 48 on the lower surface of the rectangle and on both sides of the rectangle in the width direction (Y direction). Therefore, the heat dissipation of the detection terminal 18 is improved, the temperature of the detection terminal 18 is prevented from rising, and the influence of heat received from the molten slag bath 7 can be suppressed.
That is, since the detection terminal 18 of the molten slag bath detector 13 capable of detecting the welding voltage of the molten slag bath is attached to the upper part of the pad body 40 via the insulating member 48, the detection terminal 18 has a simple structure. This can suppress the effects of heat.

Moreover, since the surface 18a of the detection terminal 18 on the base material 3 side is formed flat, adhesion of slag is suppressed. Even if a small amount of slag adheres to the surface 18a, the thickness of the slag adhered to the surface 18a is thin and will be remelted during the next welding, so it will not substantially affect the welding.

Further, as shown in FIG. 4, the upper end portion of the movable member (following member) 61, that is, the upper end portion 64b of the upper block 64 is located above the lower end portion 18b of the detection terminal 18 by a height h. Thereby, the melting voltage of the molten slag provided below the plurality of blocks 64 can be reliably detected.

The differential amplifier 19 receives the voltage of the detection terminal 18 and the ground voltage as inputs, and outputs the difference between the two voltages. The contact determination reference signal setting device 20 outputs, as a reference signal, a voltage that does not cause false detection due to noise, for example, a voltage that is about half the voltage detected when the detection terminal 18 contacts the molten slag bath 7.

The comparator 21 receives the output signal of the differential amplifier 19 and the reference signal of the contact determination reference signal setter 20 as input, and the output signal of the differential amplifier 19 becomes larger than the reference signal of the contact determination reference signal setter 20. At this time, a signal indicating that the detection terminal 18 and the molten slag bath 7 have come into contact is generated. The generated signal is sent to the flux supply control device 15, and the flux supply device 14 starts and stops supplying the flux 12. Then, the upper surface of the molten slag bath 7 is controlled to be located at a predetermined length from the tip of the contact tip 5, and the dry extension Ld is maintained at a predetermined length. When the detection terminal 18 is not in contact with the molten slag bath 7, no welding voltage is applied to the detection terminal 18, so the voltage of the detection terminal 18 is 0V.

Furthermore, in the molten slag bath detector 13, if the value of the reference signal of the contact determination reference signal setting device 20 is small, there is a possibility that correct judgment cannot be made due to the welding condition or external noise. Therefore, when the welding torch 4 is oscillated, a low-pass filter may be installed in the molten slag bath detector 13 between the differential amplifier 19 and the comparator 21 in order to prevent false detection.

(Second embodiment)
Next, a sliding copper pad for welding according to a second embodiment will be described with reference to FIGS. 13 to 16.
The slag leak prevention part 70 included in the sliding copper pad 30 for welding of this embodiment is provided on both sides of the pad body 40 and includes variable members 71 that can be deformed along the shape of the base material 3. The variable member 71 is a thin plate-like elastic member that is heat resistant and flexible and is made of carbon fiber or the like and is elongated along the longitudinal direction (Z direction) of the pad body 40 .

The variable member 71 is held between a holding plate 73 and a pressing plate 72, and is assembled together with screws 74. The pressing plate 72 is a plate-like member that is bent closer to the base material side than the holding plate 73 and has a substantially V-shaped cross section, and when assembled to the holding plate 73 while holding the variable member 71, The end portion 71a is bent toward the inside of the sliding copper pad 30 for welding. The pressing plate 72 is fixed to the mounting surface 33 of the rotating member 31 with screws 75 together with the variable member 71 and the holding plate 73. The end portion 71a of the variable member 71, which is the contact surface that contacts the base material 3, protrudes toward the base material 3 side from the facing surface 41a of the base 41, which is the contact surface of the pad body 40 with the base material 3. .

Next, the function of preventing leakage of molten slag or molten metal will be described with reference to FIG. 16. In addition, in FIG. 16, the variable member 71 is displayed with hatching in order to clearly show the deformation of the variable member 71.
The sliding copper pad 30 for welding is arranged so that the contact surface 32 of the rotating member 31 is brought into contact with the side surface (front side) 3a of the lower base material 3D on which the copper pad 1 is disposed on the back surface. At this time, as shown in FIG. 16(a), the end 71a of the variable member 71 on the base material 3 side comes into contact with the surface 3a of the base material 3D, and is elastically deformed following the surface shape of the base material 3D. Then, it contacts the base material 3D with the gap closed. In this way, welding is performed with no gap between the base material 3D and the variable member 71, so molten slag or molten metal does not leak out from the gap between the variable member 71 and the base material 3D.

As welding progresses along the welding line, the upper end of the sliding copper pad 30 for welding reaches the serpin processed portion 3S, as shown in FIG. 16(b). At this time, although there is a difference in thickness between the lower base material 3D and the upper base material 3U, the variable member 71 deforms following the shape of the serpin-processed part 3S, There is no gap between the variable member 71 and the variable member 71. Thereafter, as shown in FIGS. 16(c) and 16(d), the gap generated between the base material 3 including the serpin processed portion 3S and the sliding copper pad 30 for welding is closed by the variable member 71. Therefore, the base materials 3 having different thicknesses in the vertical direction can be welded satisfactorily without leakage of molten slag or molten metal.
Therefore, the variable member 71 of the present embodiment also constitutes a follower member of the present invention that is movable such that the end portion 71a facing the base material 3 contacts or approaches the base material 3.
Other configurations and operations are similar to those of the first embodiment.

Note that the present invention is not limited to the embodiments and modifications described above, and can be modified, improved, etc. as appropriate.
For example, in the embodiment described above, the stopper main body 40 is configured to include the pair of rotating members 31, and the support block 62 of the slag leakage prevention unit 60 and the slag leakage prevention unit 70 are attached to the mounting surface 33 of the rotational member 31. However, the present invention is not limited to this, and may be attached to the side surface of the base 41 of the pad body 40.
Further, even when the pad main body 40 does not have a rotating member, the support block 62 of the slag leak prevention section 60 and the slag leak prevention section 70 may be attached to the side surface of the base 41 of the pad main body 40 .
Furthermore, the support block 62 of the slag leak prevention part 60 may be formed integrally with the base part 41 of the pad body part 40 by extending the base part 41 in the width direction.

Furthermore, in the present invention, the slag leakage prevention section 60 and the slag leakage prevention section 70 can be used in combination, and the slag leakage prevention section 60 can also be configured by combining different types of blocks 64. It is.

FIG. 17 shows various modified examples of the sliding copper pad 30 for welding using the slag leak prevention part 60 of the first embodiment.
In FIG. 17(a), a movable member 61 consisting of a plurality of blocks 64 is arranged on one end surface 40c of the stopper main body 40 (that is, the attached surface 33 of the rotating member 31 or the side surface of the base 41), and A movable member 61 made of a single member is arranged on the end surface 40d.
In FIG. 17(b), a movable member 61 having blocks 64 of different sizes is disposed on at least one of both end surfaces 40c and 40d of the pad body 40. As shown in FIG.
In FIG. 17(c), a plurality of movable members 61 including movable members 61 made of blocks 64 of different sizes are arranged in two rows on both end surfaces 40c and 40d of the pad body 40, and two The heights of the blocks 64 in the rows are made different. Thereby, even if leakage occurs from the slag leakage prevention section 60 on the inner side in the width direction, the leakage can be reliably prevented by the slag leakage prevention section 60 on the outside in the width direction. Moreover, the effect of aligning the edges of the beads can be obtained.
In FIG. 17(d), the movable member 61 made up of a plurality of blocks 64 is arranged asymmetrically.

FIG. 18 shows a modification in which a slag leak prevention section 60 including a movable member 61 and a slag leak prevention section 70 including a variable member 71 are arranged singly or in combination.
In FIG. 18A, one slag leak prevention part 60 is arranged on one end surface 40c of the pad body 40 to prevent leakage from the one end surface 40c side of the pad body 40.
In FIG. 18(b), a slag leak prevention section 60 is arranged on one end surface 40c of the pad body 40, and a slag leak prevention section 70 is arranged on the other end surface 40d.
In FIG. 18(c), the slag leak prevention parts 60 are arranged in two rows on both end surfaces 40c and 40d of the pad main body part 40, and are shifted in the vertical direction.

In FIG. 18(d), a slag leak prevention section 60 and a slag leak prevention section 70 are arranged in two rows on one end surface 40c of the pad body 40, and a slag leak prevention section 70 is arranged on the other end surface 40d. has been done. The slag leakage prevention parts 60 and 70 do not necessarily have to be parallel to the end surfaces 40c and 40d of the pad main body part 40 (in the Z direction), and can also be arranged diagonally at an angle of 45 degrees or less with respect to the Z direction. .
In FIG. 18(e), a slag leak prevention part 60 is arranged in the upper half of both end surfaces 40c and 40d of the pad body 40, and a slag leak prevention part 70 is arranged in the lower half.
In FIG. 18(f), slag leakage prevention parts 60 are arranged on both end surfaces 40c and 40d of the pad body 40, and a slag leakage prevention part 70 is further arranged on the outside thereof.

As mentioned above, the following matters are disclosed in this specification.
(1) A sliding copper pad for welding that is disposed opposite to a groove between a pair of base materials and slides along the groove so as to form a molten slag bath or a molten metal bath,
A padding body,
at least one follower member that is provided on at least one side of the pad main body and is movable so that its end facing the base material comes into contact with or comes close to the base material;
A sliding copper pad for welding.
According to this configuration, leakage of molten slag or weld metal can be prevented even in a joint portion where plate thicknesses differ in the weld line direction.

(2) The following member is a movable member that can move toward or away from the base material, or a variable member that can be deformed along the shape of the base material.
The sliding copper pad for welding according to (1).
According to this configuration, the movable member or the variable member can prevent leakage of molten slag or weld metal even in a joint portion where the plate thicknesses differ in the weld line direction.

(3) The movable member is moved relative to the pad body so that the end portion of the movable member protrudes toward the base material from the contact surface of the pad body with the base material. further comprising a biasing member biasing toward the base material;
The sliding copper pad for welding described in (2).
According to this configuration, by bringing the sliding copper pad into contact with the pair of base materials, at least a portion of the end of the movable member comes into contact with the base materials with biasing force, so that Even in joints with different plate thicknesses, leakage of molten slag or weld metal can be reliably prevented.

(4) further comprising a support part attached to the side of the pad main body part and supporting the movable member,
The biasing member biases the movable member toward the base material with respect to the support portion.
The sliding copper pad for welding described in (3).
According to this configuration, the movable member and the biasing member can be easily attached to the side of the pad main body by the support portion.

(5) The sliding copper pad for welding according to any one of (2) to (4), wherein the movable member includes a plurality of blocks arranged side by side in the welding line direction.
According to this configuration, by dividing the movable member into a plurality of blocks, the gap between the base material and the end of the movable member can be further reduced, and leakage of molten slag or weld metal can be reliably prevented.

(6) Each of the blocks is attached to the pad body so that the ends of the plurality of blocks protrude toward the base material from the contact surface of the pad body with the base material. The sliding copper pad for welding according to (5), further comprising a plurality of biasing members each biasing toward the base material.
According to this configuration, by bringing the sliding copper pad into contact with the pair of base metals, at least one end of the plurality of blocks comes into contact with the base metal with a biasing force, so that Even in joints with different plate thicknesses, leakage of molten slag or weld metal can be reliably prevented.

(7) The variable member is constituted by an elongated plate-shaped elastic member along the longitudinal direction of the pad main body,
The elastic member is attached to the side of the pad body so that the end portion thereof protrudes toward the base material beyond the contact surface of the pad body with the base material. The sliding copper pad for welding described in (2).
According to this configuration, the variable member can be deformed to follow the surface of the base material, and leakage of molten slag or weld metal can be prevented even in a joint portion where the plate thicknesses differ in the weld line direction.

(8) The following member has a predetermined width and a predetermined thickness,
The upper end of the following member is located above the molten slag bath or the molten metal bath,
The lower end of the following member is located above the lower end of the pad main body.
The sliding copper pad for welding according to any one of (1) to (7).
According to this configuration, cooling performance for cooling the molten metal can be ensured. Furthermore, leakage of molten metal can be prevented over the entire length of the sliding copper pad for welding.

(9) A water cooling path is provided within the pad body.
The sliding copper pad for welding according to any one of (1) to (8).
According to this configuration, the sliding copper pad for welding can be effectively cooled by the cooling water supplied to the water cooling path.

(10) A detection terminal of a molten slag bath detector capable of detecting the welding voltage of the molten slag bath or the molten metal bath is attached to the upper part of the pad body via an insulating member.
The sliding copper pad for welding according to any one of (1) to (9).
According to this configuration, the detection terminal can transmit the heat of the molten slag bath or the molten metal bath to the pad body side through the insulating member, and can suppress the influence of heat with a simple structure.

(11) The detection terminal is fitted into a groove penetrating the upper part of the pad body in the thickness direction via the insulating member,
The sliding copper pad for welding according to (10), wherein the surface of the detection terminal on the base metal side is formed across the entire base metal side opening of the groove through the insulating member.
According to this configuration, adhesion of molten slag to the detection terminal can be prevented.

(12) The upper end of the following member is located above the lower end of the detection terminal.
The sliding copper pad for welding according to (10) or (11).
According to this configuration, the melting voltage of the molten slag or weld metal provided below the upper end of the follower member can be reliably detected.

(13) The pad main body includes a base and at least one rotating member rotatably supported with respect to the base,
The rotating member has a contact surface that extends in a longitudinal direction along the groove and can come into contact with the base material.
The sliding copper pad for welding according to any one of (1) to (12).
According to this configuration, the rotating member can prevent leakage of molten slag or weld metal from the base material having different plate thicknesses in the left and right directions.

(14) The rotating member further has an attached surface exposed to the side of the pad main body,
the following member is attached to a mounting surface of the rotating member;
(13) The sliding copper pad for welding as described in (13).
According to this configuration, leakage of molten slag or weld metal can be prevented even when the base material, which has a difference in plate thickness in the left-right direction, further has a difference in plate thickness in the weld line direction.

(15) The sliding copper pad for welding according to (13) or (14), wherein the base portion and the rotating member each have a water cooling path.
According to this configuration, the rotating member can be effectively cooled by the cooling water supplied to the water cooling path.

(16) The sliding copper pad for welding according to any one of (1) to (15),
welding torch and
a molten slag bath detector that detects a slag bath height of the molten slag bath or the molten metal bath;
a flux supply device that supplies flux to the molten slag bath or the molten metal bath;
a traveling carriage that carries the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moves along the groove;
Equipped with
Welding equipment.
According to this configuration, joint portions having different plate thicknesses in the welding line direction can be welded while preventing leakage of molten slag or weld metal.
can.

(17) Arranging the sliding copper pad for welding according to any one of (1) to (15) toward the groove between the pair of base materials,
Filling the groove with flux and supplying a welding wire from the tip of the contact tip,
Welding is performed by moving the contact tip along the groove and slidingly moving the welding sliding copper pad along the groove.
Welding method.
According to this configuration, joint portions having different plate thicknesses in the welding line direction can be welded while preventing leakage of molten slag or weld metal.

(18) A sliding copper pad for welding that is arranged to face a groove between a pair of base materials and slides along the groove so as to form a molten slag bath or a molten metal bath,
A padding body,
a detection terminal of a molten slag bath detector that is attached to the upper part of the pad body via an insulating member and is capable of detecting a welding voltage of the molten slag bath or the molten metal bath;
Equipped with
Sliding copper pad for welding.
According to this configuration, the detection terminal can transmit the heat of the molten slag bath or the molten metal bath to the pad body side through the insulating member, and can suppress the influence of heat with a simple structure.

(19) The detection terminal is fitted into a groove penetrating the upper part of the pad body in the thickness direction via the insulating member,
The sliding copper pad for welding according to (18), wherein the surface of the detection terminal on the base metal side is formed across the entire base metal side opening of the groove through the insulating member.
According to this configuration, adhesion of molten slag to the detection terminal can be prevented.

(20) The upper end of the following member is located above the lower end of the detection terminal.
The sliding copper pad for welding according to (18) or (19).
According to this configuration, the melting voltage of the molten slag or weld metal provided below the upper end of the follower member can be reliably detected.

2 Bevel section 3 Base material 3D Lower base material 3S Serpin processing section 3U Upper base material 4 Welding torch 5 Contact tip 6 Welding wire 7 Molten slag bath 9 Molten metal 12 Flux 13 Molten slag bath detector 14 Flux supply device 16 Travel Dolly 18 Detection terminal 18a Surface 18b Lower end 30 Welding sliding copper pad 31 Rotating member 32 Contact surface 33 Mounted surface 34 Support shaft 38 Water cooling path 39 Sliding bearing 40 Pad body 41 Base 41a Opposing surface 41b Lower end 47 Concave groove 48 Insulating members 60, 70 Slag leak prevention part 61 Movable member (following member)
62 Support block (support part)
63 Biasing member 64 Block 64a End 64b Upper end 64c Lower end 65 Cover (support part)
71 Variable member (elastic member)
71a End portion 100 Electroslag welding device

Claims (13)

A sliding copper pad for welding that is disposed opposite to a groove between a pair of base materials and slides along the groove so as to form a molten slag bath or a molten metal bath,
A padding body,
at least one follower member that is provided on at least one side of the pad main body and is movable so that its end facing the base material comes into contact with or comes close to the base material;
Equipped with
The following member is a movable member that can move toward or away from the base material,
The movable member includes a plurality of blocks arranged side by side in a welding line direction along the groove.
Sliding copper pad for welding. Each of the blocks is attached to the base material with respect to the pad body so that the ends of the plurality of blocks protrude toward the base material from the contact surface of the pad body with the base material. The sliding copper pad for welding according to claim 1 , further comprising a plurality of biasing members each biasing the welding member. further comprising a support part attached to the side of the pad main body part and supporting the plurality of blocks ,
The plurality of urging members respectively urge the plurality of blocks toward the base material with respect to the support portion,
The sliding copper pad for welding according to claim 2 . A sliding copper pad for welding that is disposed opposite to a groove between a pair of base materials and slides along the groove so as to form a molten slag bath or a molten metal bath,
A padding body,
at least one follower member that is provided on at least one side of the pad main body and is movable so that its end facing the base material comes into contact with or comes close to the base material;
Equipped with
The following member is a variable member that can be deformed along the shape of the base material,
The pad main body includes a base and at least one rotating member rotatably supported with respect to the base,
The rotating member has a contact surface that extends in a longitudinal direction along the groove and can come into contact with the base material,
The variable member is constituted by a plate-shaped elastic member that is elongated along the longitudinal direction of the pad main body,
The end portion of the elastic member is in contact with the surface of the base material, and is elastically deformed to follow the surface shape of the base material, and has a shape that is smaller than the contact surface of the pad body with the base material. attached to the side of the pad main body so as to protrude toward the base material side;
Sliding copper pad for welding. The following member has a predetermined width and a predetermined thickness,
The upper end of the following member is located above the molten slag bath or the molten metal bath,
The lower end of the following member is located above the lower end of the pad main body.
The sliding copper pad for welding according to any one of claims 1 to 4 . A water cooling path is provided in the pad main body.
The sliding copper pad for welding according to any one of claims 1 to 5 . A detection terminal of a molten slag bath detector capable of detecting the welding voltage of the molten slag bath or the molten metal bath is attached to the upper part of the pad body via an insulating member.
The sliding copper pad for welding according to any one of claims 1 to 6 . The upper end of the following member is located above the lower end of the detection terminal.
The sliding copper pad for welding according to claim 7 . The pad main body includes a base and at least one rotating member rotatably supported with respect to the base,
The rotating member has a contact surface that extends in a longitudinal direction along the groove and can come into contact with the base material.
The sliding copper pad for welding according to any one of claims 1 to 3 and 5 to 8 . The rotating member further has a mounting surface exposed to the side of the pad main body,
the following member is attached to a mounting surface of the rotating member;
The sliding copper pad for welding according to claim 9 . The sliding copper pad for welding according to claim 9 or 10 , wherein the base portion and the rotating member each have a water cooling path. A sliding copper pad for welding according to any one of claims 1 to 11 ,
welding torch and
a molten slag bath detector that detects a slag bath height of the molten slag bath or the molten metal bath;
a flux supply device that supplies flux to the molten slag bath or the molten metal bath;
a traveling carriage that carries the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moves along the groove;
Equipped with
Welding equipment. The sliding copper pad for welding according to any one of claims 1 to 12 is arranged toward the groove between the pair of base materials,
Filling the groove with flux and supplying a welding wire from the tip of the contact tip,
Welding is performed by moving the contact tip along the groove and slidingly moving the welding sliding copper pad along the groove.
Welding method.

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