JP2022102788A - Slidable copper strap for welding, welding device, and welding method - Google Patents

Abstract

To provide a slidable copper strap for welding which can prevent leakage of molten slug or molten metal in even a joint part with different plate thicknesses in a welding line direction, a welding device and a welding method.SOLUTION: A slidable copper strap 30 for welding, that is so located as to face a groove part 2 between a pair of base materials 3, comprises: a strap body part 40; and at least one movable member 61 which is provided on at least one side of the strap body part 40, and of which a facing surface 41a facing the base material 3 is movable so as to contact or close to the base material 3.SELECTED DRAWING: Figure 3

Description

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

Vertical welding methods such as electroslag welding and electrogas arc welding are widely used for high-efficiency construction of vertical joints for shipbuilding and welding of large structures such as oil tanks.

In particular, in electroslag welding using Joule heat of molten slag as a heat source, heat is generated in the molten slag instead of the exposed arc to melt the wire and the base metal, so that arc radiation heat is not generated and fume. The generation of spatter is small and the working environment is improved. In addition, since the weld metal is shielded from the atmosphere by the molten slag, no shielding gas is required, the shielding effect does not deteriorate even if the plate thickness increases, and the intrusion into the molten metal such as nitrogen existing in the atmosphere is prevented. Since it can be effectively prevented regardless of the thickness, there is an advantage that mechanical deterioration of the weld metal does not occur.

Further, in both the electroslag welding method and the electrogas arc welding method, it is known to use a small water-cooled sliding copper pad having a length sufficient to cover a molten slag bath or a molten metal bath. .. As a result, the welding torch and bogie are raised by rails and chains as the welding progresses, and the water-cooled sliding copper pad is moved along the welding line together with the torch and bogie, enabling long welding of several tens of meters. It is supposed to be.

In Patent Document 1, in vertical electrogas arc welding in which a sliding copper pad is abutted against the groove surface of an object to be welded and welded, sliding is performed when welding while pressing the sliding copper pad in the plate thickness direction. The pressing force that presses the lower part of the copper pad is 1/4 to 1/2 of the pressing force that presses the central part, and it melts even in the joint part where the base metal with different plate thickness in the welding line direction is subjected to surpin processing. It is disclosed to prevent leakage of metal and molten slag. Specifically, when the sliding copper pad passes through the end face of the surpin-processed portion of the upper base metal and then becomes vertical along the surface of the upper base metal, it is between the molten metal and the sliding copper pad. It prevents the weld metal and molten slag from leaking through the gaps that occur in the slag.

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

Japanese Patent Application Laid-Open No. 2003-236667 Japanese Unexamined Patent Publication No. 2016-215214

FIG. 19 shows a process of welding the surpin processed portion 3S of the base metal 3 having a difference in plate thickness in the welding line direction by using the 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 surpin processed portion 3S of the upper base material 3U, the upper end portion of the sliding copper pad 200 rises along the surpin processed portion 3S (FIG. 19 (FIG. 19). b)), a gap S1 is formed between the sliding copper pad 200 and the base metal 3. When welding further progresses and the sliding copper pad 200 becomes parallel to the surpin processed portion 3S (see FIG. 19C), a gap portion S2 is formed between the upper portion of the sliding copper pad 200 and the upper base material 3U. Occurs. Therefore, there is a concern that molten slag or molten metal leaks from the voids S1 and S2 and welding is interrupted, and improvement has 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. 19D), a gap portion S3 is formed between the lower portion of the sliding copper pad 200 and the surpin processed portion 3S. However, if the molten slag or the weld metal is already solidified, the molten slag or the weld metal does not leak.

The method described in Patent Document 1 aims to prevent leakage of molten metal and molten slag from the void portion S3 in the state of FIG. 19 (d), and FIGS. 19 (b) and 19 (c). In the above 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 an object thereof is a sliding for welding that can prevent leakage of molten slag or molten metal even in a joint portion having a difference in plate thickness in the direction of the welding line. To provide copper pads, welding equipment and welding methods.

The above object of the present invention is achieved by the following configuration.
[1] A sliding copper pad for welding that is arranged facing a groove between a pair of base materials so as to form a molten slag bath or a molten metal bath and slides along the groove.
The main body of the backing and
An at least one follower member provided on at least one side of the pad body and capable of moving so that an end facing the base material abuts or approaches 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 the 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 equipped with the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moving along the groove portion.
To prepare
Welding equipment.
[3] The sliding copper pad for welding according to [1] is arranged toward the groove between the pair of base materials.
The groove is filled with flux, and the welding wire is supplied from the tip of the contact tip.
The contact tip is moved along the groove portion, and the sliding copper pad for welding is slid and moved along the groove portion for welding.
Welding method.

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

It is a figure which shows the schematic structure of the electroslag welding apparatus which concerns on one Embodiment of this invention. It is a perspective view which looked at the sliding copper pad for welding of 1st Embodiment from the back side. FIG. 3 is a perspective view of the sliding copper pad for welding shown in FIG. 2 as viewed from the front side. It is a front view of the front side of the sliding copper pad for welding shown in FIG. 2. It is a top view of the sliding copper pad for welding shown in FIG. FIG. 5 is a sectional view taken along line VI-VI of FIG. It is a partial fracture side view of the slag leakage prevention part of the sliding copper pad for welding shown in FIG. 2. It is sectional drawing which shows the state which arranged the copper pad and the sliding copper pad for welding in the groove part of a butt joint. It is sectional drawing which shows the state which arranged the copper pad and the sliding copper pad for welding on the surface of the base metal having an angle. It is a side view which shows the process of welding the joint part which has the difference in the plate thickness in the welding line direction by the sliding copper pad for welding of 1st Embodiment. It is a figure which shows the structural example of the molten slag bath detector. It is a perspective view which shows the sliding copper pad for welding in the state which the detection terminal is removed from the pad main body part. It is a perspective view which looked at the sliding copper pad for welding of 2nd Embodiment from the back side. It is a perspective view of the slag leakage prevention part of the sliding copper pad for welding shown in FIG. It is an enlarged top view of the slag leakage prevention part of the sliding copper pad for welding shown in FIG. It is a side view which shows the process of welding the joint part which has the difference in the plate thickness in the welding line direction by the sliding copper pad for welding of 2nd Embodiment. It is a front schematic diagram which shows various deformation examples of the sliding copper pad for welding of 1st Embodiment. It is a front schematic diagram which shows various deformation examples of the sliding copper pad for welding. It is a side view which shows the process of welding the joint part which has a difference in plate thickness in the welding line direction by the conventional sliding copper pad for welding.

Hereinafter, an embodiment of a sliding copper pad for welding, a welding device using the sliding copper pad for welding, and a welding method according to the present invention will be described in detail with reference to the drawings. The sliding copper pad for welding according to the present invention can be applied to both electroslag welding and electrogas arc welding, but in the following description, electroslag welding will be described as an example.

<Structure 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 material (vertical direction), the arrow X is the plate thickness direction of the base material, and the arrow Y is the direction in which the pair of base materials are lined up. That is, it is in the horizontal direction along the surface of the base metal. Therefore, the upper side is the upper side with respect to the paper surface of FIG. 1, the lower side is the lower side with respect to the paper surface of FIG. 1, the front side is the left side with respect to the paper surface of FIG. On the other hand, it is on the right side. Further, also in FIG. 2, assuming a state in which the sliding copper pad for welding is arranged on the surface of the base metal, the arrow Z indicates the longitudinal direction of the sliding copper pad for welding (the length of the main body of the pad). Direction), arrow X is the thickness direction of the sliding copper pad for welding (thickness direction of the pad body), and arrow Y is the width direction of the sliding copper pad for welding (pad body). In the width direction of).

As shown in FIG. 1, the 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. A supply device 14, a flux supply control device 15, a traveling trolley 16, and a traveling trolley control device 17 are provided.

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. Will be done. Here, instead of the copper pad 1 on the back side, a backing material made of heat-resistant ceramics may be used. Further, 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 replaced with a material other than copper.

The welding torch 4 feeds the welding wire 6 by a welding current 8 supplied from a welding power source (not shown) to weld the base metal 3. Further, the welding torch 4 has a contact tip 5, and the contact tip 5 guides the welding wire 6 and supplies a welding current 8 to the welding wire 6.

The molten slag bath detector 13 detects the position of the molten slag bath 7. The flux supply device 14 puts the flux 12 into the 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.

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

The traveling trolley 16 is equipped with a sliding copper pad 30 for welding, a welding torch 4, a molten slag bath detector 13, a flux supply device 14, a flux supply control device 15, and a traveling trolley control device 17, and is mounted in the upward direction (upward direction). Move in the direction of arrow Z). That is, the traveling carriage 16 moves integrally with the sliding copper pad 30 for welding, the welding torch 4, the molten slag bath detector 13, the flux supply device 14, the flux supply control device 15, and the traveling carriage control device 17. Therefore, the relative positional relationship between them does not change. As the traveling carriage 16 rises, welding is performed along the upward direction.

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

Then, the 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, and into the groove. It is sent into the formed molten slag bath 7. The welding current 8 flows from the welding wire 6 to the molten metal 9 through the molten slag bath 7. At this time, Joule heat is generated by the welding current 8 flowing through the molten slag bath 7 and the resistance of the molten slag bath 7, and welding proceeds 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 part of the molten slag bath 7 is welded between the copper pad 1 and the weld metal 10 and with the sliding copper pad 30 for welding. It becomes a molten slag layer formed between the metal 10 and the molten slag layer, and the molten slag layer is cooled to become a solidified slag 11. In this way, since a part of the molten slag bath 7 becomes the solidified slag 11 that covers the bead surface, it is consumed as the 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 additionally add a flux 12 that melts into 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 weld groove. Further, the amount of the 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 the solidified slag 11 is not constant, and it is necessary to change the amount of the flux 12 to be charged in order to keep the depth Ls of the molten slag bath 7 constant. However, since the depth Ls of the molten slag bath 7 is not known, if the amount of the flux 12 input is not appropriate, the depth Ls of the molten slag bath 7 will fluctuate.

Therefore, in the present embodiment, control is performed to keep the depth Ls of the molten slag bath 7 constant. Here, the term "constant" is not limited to the case where the depth Ls of the molten slag bath 7 always becomes one value, and the case where the depth Ls of the molten slag bath 7 shows a value within a certain range in consideration of an error. Is also included. That is, the depth Ls of the molten slag bath 7 is controlled so as 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 (hereinafter referred to as dry extension Ld) from the tip of the contact tip 5 to the upper surface of the molten slag bath 7 is satisfied. It is to control so that the length becomes a predetermined length. The second requirement for keeping the depth Ls of the molten slag bath 7 constant is the relationship in which the welding current 8 is predetermined with respect to the reference current value determined according to the wire feeding speed, that is, the reference. The traveling carriage control device 17 controls the traveling speed of the traveling carriage 16 so that the current value and the welding current 8 become equal to each other. At the same wire feeding speed, (Ld + Ls) and the welding current 8 have a correlation, and the traveling carriage control device 17 controls the traveling speed of the traveling carriage 16 so that the reference current value and the welding current 8 become equal to each other. Then, (Ld + Ls) is kept constant.
The weld 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 30 for welding includes a base 41 and a pad main body 40 having a pair of rotating members 31 and 31 rotatably held by the base 41. A pair of slag leakage prevention portions 60 for preventing leakage of molten slag or molten metal are provided on both sides of the backing body portion 40 and in joint portions having different plate thicknesses in the direction of the welding line.

The base 41 of the backing body 40 is formed in a substantially rectangular plate shape, and a pair of arcuate holes 42 opening on the side facing the base material 3 on the facing surface 41a side and the width direction side are long at both ends in the width direction. It is formed at both ends in the direction (Z direction).

The facing surface 41a of the base 41 between the pair of arcuate holes 42 is a recess 43 slightly recessed in the central portion 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 bag holes 44 are formed inside the pair of arcuate holes 42 in the width direction in substantially parallel to each other in the Z direction from the lower end. The opening end of the bag hole 44 is sealed by a stopcock (not shown).

Further, at the lower part of each bag hole 44, a pair of through holes 45 communicating with the bag hole 44 are formed from the opposite side of the recess 43 (see FIGS. 8 and 9). Further, the upper portions of the bag holes 44 are communicated with each other by the communication holes 45A extending in the width direction (see FIG. 4). The bag hole 44, the pair of through holes 45, and the communication hole 45A form a part of the water cooling path 38 for flowing the cooling water described later.

The pair of rotating members 31 are substantially columnar members having a substantially fan-shaped cross section, and have two flat contact surfaces 32 and an attached surface 33 extending in the longitudinal direction by cutting out a part of the outer peripheral surface thereof. The two contact surfaces 32 and the attached surface 33 are formed in parallel with the axial center 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, support shaft portions 34 having a small diameter are formed at both ends in the axial direction of the rotating member 31, and are rotatably fitted to the slide bearing 39 screwed to the base 41 of the backing body portion 40. It fits. The slide bearing 39 is formed in a substantially fan shape in outer shape, and two flat surface portions 39a and 39b are provided on a part of the outer diameter surface corresponding to the contact surface 32 and the mounted surface 33 (see FIG. 3).

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

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

Here, as shown in FIG. 5, the length L1 of the 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 (the same as the center O of the rotating member 31) to the base. Of the facing surfaces 41a of 41, the length of the perpendicular line with respect to the front end surface 41c other than the recess 43 is set to be longer than L2 (L1> L2).

Therefore, in the pair of rotating members 31 in which the support shaft portions 34 at both ends in the axial direction are fitted to the slide bearing 39 and rotatably fitted into the arcuate hole 42 of the base portion 41, the contact surface 32 thereof is the base portion 41. It is assembled in a state where only L1-L2 protrudes from the front end surface 41c of. That is, the pair of rotating members 31 are supported by the metal fitting main body 40 so that the contact surface 32 protrudes from the facing surface 41a of the base 41 toward the base metal 3 by L1-L2.

Further, as shown in FIG. 6, in the sliding bearing 39 having a substantially D-shaped external shape, the length L3 of the perpendicular line from the center O of the rotating member 31 (the same as the center of the support hole of the sliding bearing 39) to the flat surface portion 39a is set. The length of the perpendicular line from the center O of the arcuate hole 42 of the base 41 to the front end surface 41c is the same as the length L2. Therefore, the flat surface 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 portions 60 are arranged in a substantially rectangular parallelepiped shape so as to be slidable with each other in the vertical direction along the groove portion 2 (the embodiment shown in the figure). Then, the block 64), the plurality of support shafts 66 to which one end is attached on the opposite side of the end 64a of the plurality of blocks 64, and the plurality of blocks 64 are supported via the plurality of support shafts 66. A plurality of attachments such as coil springs that abut the support block 62 and the head 66a formed at the other end of the support shaft 66 to abut or press the plurality of blocks 64 in the direction of contacting or approaching the base material 3. It includes a urging member 63 and a cover 65 that supports the ends of the plurality of urging members 63 and is attached to the support block 62.

The support block 62 is formed to be long in accordance with the total length of the plurality of blocks 64 in the vertical direction (Z direction in FIG. 7), and the rotating member 31 provided on the side of the backing body portion 40. It is screwed to the mounted surface 33. Further, in the support block 62, a plurality of support holes 67 that penetrate in the thickness direction of the sliding copper pad 30 for welding and slidably fit each support shaft 66 correspond to the number of blocks 64. The sliding copper pads 30 for welding are formed side by side in the longitudinal direction.

Therefore, each urging member 63 whose end portion on the anti-base material side is supported by the cover 65 urges each block 64 via the support shaft 66, and in a normal state, the end portions 64a of each block 64 are paired. It is in a state of protruding toward the base material 3 side from the contact surface 32 which is the contact surface of the rotating member 31 of the above.

In this way, since each block 64 is pressed in a direction in contact with or close to the base material 3 by the elastic force of the urging member 63, the sliding copper pad 30 for welding opens the pair of base materials 3. In the state of being arranged on the front side, the end portion 64a facing the base material 3 of each block 64 abuts on the base material 3, or the head 66a of the support shaft 66 abuts on the support block 62. , Located in a position close to the base metal 3. Further, the sliding copper pad 30 for welding slides along the direction of the welding line, so that each block 64 follows the surface shape of the base metal 3 and is perpendicular to the longitudinal direction of the pad body 40. It moves in the thickness direction (X direction).

That is, the plurality of blocks 64 constitute the follow-up member of the present invention in which the end portion 64a facing the base material 3 can be moved so as to be in contact with or close to the base material 3. Further, the plurality of blocks 64 constitute a movable member 61 that can move in a direction that approaches or separates from the base material 3. That is, in the present embodiment, the end portions 64a of the plurality of blocks 64 constitute the end portion of the follower member of the present invention and the end portion of the movable member 61.
Further, the support block 62 and the cover 65 of the present embodiment constitute a support portion of the present invention that supports the movable member 61.

The movable member 61 may be composed of a single member as long as it functions as the following member and can move in the direction of approaching or separating from the base material 3, but in the present embodiment. As described above, 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 the joint portions having different plate thicknesses in the vertical direction, and the molten slag can be formed. Leakage can be prevented more reliably.
Further, in the present embodiment, the plurality of blocks 64 move in the thickness direction perpendicular to the longitudinal direction of the backing main body 40, but if they approach the base material 3 or separate from the base material 3. , X-direction component or Y-direction component may be included and moved in an oblique direction.

Further, the plurality of blocks 64, the support shaft 66, and the support block 62 are made of a metal material having good heat transfer properties (in the present embodiment, the material of the block 64 and the support block 62 is copper, and 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 portion 60 can be cooled by the backing metal main body portion 40.
It is desirable that the slag leakage prevention unit 60 is also directly cooled, but there is no space in the slag leakage prevention unit 60, and it is difficult to install the water cooling path 38. Therefore, in order to further enhance the cooling effect, it is preferable to install the water cooling path 38 at a position close to the slag leakage prevention portion 60 of the pad main body portion 40.

Further, the pressing force on the block 64 is not limited to the elastic force of the urging member 63, and may be gravity, magnetic force, axial force, or pneumatic pressure, or may be manually pressed. When the block 64 is pressed by gravity or magnetic force other than the urging member 63, an appropriate mechanism can be adopted.

Further, the block 64 has a predetermined width (Y direction in FIG. 5) and a predetermined thickness (X direction in FIG. 5). When 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 limit of the width and the thickness is not particularly limited, but if it is too large, it becomes heavy and the driving force for moving the sliding copper pad 30 for welding along the groove becomes large, so the width is 15 mm or less and the thickness is 15 mm or less. Is preferably 10 mm or less.

Further, the upper end portion 61b of the movable member 61, that is, the upper end portion 64b of the upper block 64 is located above the molten slag bath 7, and the lower end portion 61c of the movable member 61, that is, the lower end portion of the lower block 64. 64c is located above the lower end 41b of the pad body 40. As a result, it is possible to prevent the molten slag from leaking from between the base metal 3 and the sliding copper pad 30 for welding over the entire length of the pad body 40 in the Z direction.
Here, the position of the molten slag bath 7 will be described. However, when the height of the molten slag bath 7 is detected and the height of the molten slag bath 7 is automatically controlled, the upper surface of the molten slag bath 7 is determined in advance. When 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 set in advance by the welding operator as a target.
As shown in FIG. 4, in the present embodiment, the upper end portion 64b of the movable member 61 is located below the upper end portion of the contact surface of the pad body portion 40, that is, the upper end portion 39c of the upper slide bearing 39. The lower end 64c of the movable member 61 is located above the lower end of the contact surface of the backing body 40, that is, above the lower end 39d of the lower slide bearing 39.

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

First, a case where the base metal 3 having a difference in plate thickness in the left-right direction is welded will be described.
Since the pair of rotating members 31 are rotatable with respect to the base 41 of the backing body portion 40, each contact surface 32 of the pair of rotating members 31 rotates following the surface 3a of the base material 3, and both mothers. Even if the surface 3a of the base material 3 has an angle difference (see FIG. 9), and even if the surface 3a of both base materials 3 has a difference in plate thickness in the left-right direction, a pair of rotations with the surface 3a of the base material 3 The contact surface 32 of the member 31 is surely in surface contact.

As a result, the copper pad 1, the groove portion 2 of the base metal 3, a part of the surface 3a of the base metal 3, a part of the cylindrical surface of the rotating member 31, and the recess 43 (opposing surface 41a) of the base 41 are drawn. It is formed to form an accommodating portion of molten slag.

In this way, the pair of rotating members 31 are arranged in a state where the contact surface 32 is in surface contact with the surface 3a of the base material 3, and cooling water is allowed to flow in the water cooling path 38 to allow the rotating member 31 and the base 41 from the inside. While cooling, the groove portion 2 is filled with the 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 portion 2, and a sliding copper pad for welding is provided. 30 is slid along the groove portion 2 and welded.

Since the contact surface 32 of the pair of rotating members 31 is in surface contact with the surface 3a of the base material 3, the molten slag is generated even if there is a difference in plate thickness or angle between the two base materials 3 in the left-right direction. It is possible to reliably prevent leakage from between the base material 3 and the contact surface 32 of the pair of rotating members 31. Further, a long welded portion can be welded by a small and lightweight sliding copper pad 30 for welding.

Next, as shown in FIG. 10, a case where the plate thickness differs in the welding line direction (vertical direction), that is, the plate thickness is different and the base metal 3D and 3U having the surpin processed portion 3S are welded will be described. When the base materials 3D and 3U having different plate thicknesses are welded, a gap is created between the surface 3a of the base materials 3D and 3U and the sliding copper pad 30 for welding in the surpin processing portion 3S, and molten slag leaks from the gap. There is a possibility of coming out.

The sliding copper pad 30 for welding is arranged so that the contact surface 32 of the pair of rotating members 31 is in contact with the surface 3a of the lower base material 3D on which the copper pad 1 is arranged on the back surface. At this time, as shown in FIG. 10A, each block 64 projecting from the support block 62 toward the base material due to the elastic force of the urging member 63 has its end portion 64a hitting the surface 3a of the base material 3D. Upon contact, it is pushed against the elastic force of the urging member 63, follows the surface shape of the base material 3D, and is arranged in a state where there is no gap with the base material 3D. Therefore, even if welding is performed in this state, molten slag or molten metal does not leak from the gap between the end portion 64a of the block 64 and the surface 3a of the base metal 3D.

As the welding progresses along the welding line, as shown in FIG. 10B, the upper end portion of the sliding copper pad 30 for welding reaches the surpin processed portion 3S. 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 comes into contact with or approaches the base material 3 following the shape of the sirpin processing portion 3S. By moving in this way, the gap between the surpin processed portion 3S and the end portion 64a of each block 64 is closed. Hereinafter, as shown in FIGS. 8 (c) and 8 (d), the gap generated between the base metal 3 including the surpin processing portion 3S and the block 64 of the sliding copper pad 30 for welding is the slag leakage prevention portion. The base metal 3 which is closed by 60 and has different plate thicknesses in the vertical direction can be satisfactorily welded by preventing leakage of molten slag or molten metal.

<Structure of molten slag bath detector>
Next, the configuration of the molten slag bath detector 13 will be described in detail. FIG. 11 is a diagram showing a configuration example 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.
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 30 for welding, which is the base metal voltage, but the sliding copper for welding may be input. Since the pad 30 is in contact with the molten slag bath 7 and may have a ground potential, it should be grounded as shown in FIG. 11 rather than inputting the voltage of the sliding copper pad 30 for welding. Is preferable.

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

Therefore, the detection terminal 18 is indirectly cooled by the metal fitting main body 40 which is water-cooled via the insulating member 48 on the rectangular lower surface and both side surfaces in the rectangular width direction (Y direction). Therefore, the heat dissipation of the detection terminal 18 is improved, the temperature rise of the detection terminal 18 is prevented, and the influence of the 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 metal fitting main body 40 via the insulating member 48, the detection terminal 18 has a simple structure. Therefore, the influence of heat can be suppressed.

Further, since the surface 18a on the base material 3 side of the detection terminal 18 is formed flat, the adhesion of slag is suppressed. Even if a small amount of slag adheres to the surface 18a, the thickness of the slag adhering to the surface 18a is thin and the slag is remelted at the next welding, so that there is substantially no effect on 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. As a result, the melting voltage of the molten slag provided below the plurality of blocks 64 can be reliably detected.

The differential amplifier 19 takes 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 a voltage to the extent that it is not erroneously detected due to noise, for example, a voltage of about half of the voltage detected when the detection terminal 18 comes into contact with the molten slag bath 7 as a reference signal.

The comparator 21 takes the output signal of the differential amplifier 19 and the reference signal of the contact determination reference signal setter 20 as inputs, 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 is created in which it is determined that the detection terminal 18 and the molten slag bath 7 are in contact with each other. The created signal is sent to the flux supply control device 15, and the flux 12 is supplied and stopped by the flux supply device 14. 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, the welding voltage is not applied to the detection terminal 18, so that the voltage of the detection terminal 18 is 0V.

Further, 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 determination cannot be made due to the welding state, external noise, or the like. Therefore, when oscillating the welding torch 4, the molten slag bath detector 13 may install a low-pass filter between the differential amplifier 19 and the comparator 21 in order to prevent erroneous detection.

(Second Embodiment)
Next, the sliding copper pad for welding of the second embodiment will be described with reference to FIGS. 13 to 16.
The slag leakage prevention portion 70 provided in the sliding copper pad 30 for welding of the present embodiment is provided on both sides of the pad main body 40, and includes a variable member 71 that can be deformed along the shape of the base metal 3. The variable member 71 is an elastic member having heat resistance and flexibility, for example, made of carbon fiber or the like, and has a long thin plate shape along the longitudinal direction (Z direction) of the backing body portion 40.

The variable member 71 is sandwiched between the holding plate 73 and the pressing plate 72, and is integrally assembled with screws 74. The pressing plate 72 is a plate-shaped member that is bent on the base material side of the holding plate 73 to form a substantially V-shaped cross section, and when the variable member 71 is sandwiched and assembled to the holding plate 73, the variable member 71 is formed. The end portion 71a of the surface is bent so as to be inward of the sliding copper pad 30 for welding. The pressing plate 72, together with the variable member 71 and the holding plate 73, is fixed to the mounted surface 33 of the rotating member 31 with screws 75. The end portion 71a, which is the contact surface of the variable member 71 in contact with the base material 3, protrudes toward the base material 3 side from the facing surface 41a of the base portion 41, which is the contact surface of the backing metal main body portion 40 with the base material 3. ..

Next, with reference to FIG. 16, the function of preventing leakage of molten slag or molten metal will be described. In FIG. 16, the variable member 71 is shaded in order to show the deformation of the variable member 71 in an easy-to-understand manner.
The sliding copper pad 30 for welding is arranged so that the contact surface 32 of the rotating member 31 is in contact with the side surface (front side) 3a of the lower base material 3D on which the copper pad 1 is arranged on the back surface. At this time, as shown in FIG. 16A, the end portion 71a on the base material 3 side of the variable member 71 abuts on the surface 3a of the base material 3D and elastically deforms according to the surface shape of the base material 3D. Then, the contact with the base material 3D is closed. In this way, since welding is performed without a gap between the base material 3D and the variable member 71, molten slag or molten metal does not leak from the gap between the variable member 71 and the base material 3D.

As the welding progresses along the welding line, as shown in FIG. 16B, the upper end portion of the sliding copper pad 30 for welding reaches the surpin processed portion 3S. 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 is deformed according to the shape of the surpin processing portion 3S, so that the surpin processing portion 3S There is no gap between the variable member 71 and the variable member 71. Hereinafter, as shown in FIGS. 16 (c) and 16 (d), the gap generated between the base metal 3 including the surpin processed portion 3S and the sliding copper pad 30 for welding is closed by the variable member 71. Therefore, the base metal 3 having different plate 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 the follow-up member of the present invention in which the end portion 71a facing the base material 3 can be moved so as to be in contact with or close to the base material 3.
Other configurations and operations are the same as those of the first embodiment.

The present invention is not limited to the above-described embodiments and modifications, and can be appropriately modified, improved, and the like.
For example, in the above embodiment, the backing main body 40 is configured to include a pair of rotating members 31, and the support block 62 and the slag leak preventing portion 70 of the slag leak preventing portion 60 are mounted on the mounted surface 33 of the rotating member 31. Although it is attached, the present invention is not limited to this, and it may be attached to the side surface of the base 41 of the backing main body 40.
Further, even when the backing main body 40 does not have a rotating member, the support block 62 and the slag leakage preventing portion 70 of the slag leakage preventing portion 60 may be attached to the side surface of the base 41 of the backing main body 40.
Further, the support block 62 of the slag leakage prevention portion 60 may be integrally formed with the base portion 41 by extending the base portion 41 of the backing main body portion 40 in the width direction.

Further, in the present invention, the slag leakage prevention unit 60 and the slag leakage prevention unit 70 can be used in combination, and the slag leakage prevention unit 60 may be configured by combining different types of blocks 64. Is.

FIG. 17 is an example of various modifications of the sliding copper pad 30 for welding using the slag leakage prevention portion 60 of the first embodiment.
In FIG. 17A, a movable member 61 composed of a plurality of blocks 64 is arranged on one end surface (that is, the side surface of the mounted surface 33 of the rotating member 31 or the side surface of the base 41) 40c of the backing body portion 40, and the other end surface. A movable member 61 made of a single member is arranged on the end face 40d.
In FIG. 17B, a movable member 61 having blocks 64 having different sizes is arranged on at least one of both end faces 40c and 40d of the metal pad main body 40.
In FIG. 17C, a plurality of movable members 61 including a movable member 61 made of blocks 64 having different sizes are arranged in two rows on both end faces 40c and 40d of the backing main body 40. The heights of the blocks 64 in the row are different. As a result, even if a leak occurs from the slag leakage prevention portion 60 on the inner side in the width direction, the slag leakage prevention portion 60 on the outer side in the width direction can surely prevent the leakage. In addition, the effect of aligning the beads can be obtained.
In FIG. 17D, movable members 61 composed of a plurality of blocks 64 are arranged asymmetrically.

FIG. 18 is a modified example in which the slag leakage prevention unit 60 including the movable member 61 and the slag leakage prevention unit 70 including the variable member 71 are arranged alone or in combination.
In FIG. 18A, one slag leakage prevention portion 60 is arranged on one end surface 40c of the backing main body 40 to prevent leakage from one end surface 40c side of the backing main body 40.
In FIG. 18B, the slag leakage prevention portion 60 is arranged on one end surface 40c of the pad body portion 40, and the slag leakage prevention portion 70 is arranged on the other end surface 40d.
In FIG. 18 (c), the slag leakage prevention portions 60 are arranged in two rows on both end faces 40c and 40d of the backing main body portion 40, and are offset in the vertical direction.

In FIG. 18D, the slag leakage prevention portion 60 and the slag leakage prevention portion 70 are arranged in two rows on one end surface 40c of the pad body portion 40, and the slag leakage prevention portion 70 is arranged on the other end surface 40d. Has been done. The slag leakage prevention portions 60 and 70 do not necessarily have to be parallel to the end faces 40c and 40d of the backing body portion 40 (Z direction), and may be arranged obliquely at an angle within 45 ° with respect to the Z direction. ..
In FIG. 18 (e), the slag leakage prevention portion 60 is arranged on the upper halves of both end faces 40c and 40d of the backing body portion 40, and the slag leakage prevention portion 70 is arranged on the lower half.
In FIG. 18 (f), the slag leakage prevention portion 60 is arranged on both end faces 40c and 40d of the backing main body portion 40, and the slag leakage prevention portion 70 is further arranged on the outside thereof.

As described above, the following matters are disclosed in this specification.
(1) A sliding copper pad for welding that is arranged facing a groove between a pair of base materials so as to form a molten slag bath or a molten metal bath and slides along the groove.
The main body of the backing and
An at least one follower member provided on at least one side of the pad body and capable of moving so that an end facing the base material abuts or approaches 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 having a difference in plate thickness in the direction of the weld line.

(2) The following member is a movable member that can move in a direction that approaches or separates from the base material, or a variable member that can be deformed along the shape of the base material.
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 having a difference in plate thickness in the welding line direction.

(3) The movable member is attached to the backing main body so that the end of the movable member protrudes toward the base from the contact surface of the backing main body with the base. Further equipped with an urging member that urges the base metal,
The sliding copper pad for welding according to (2).
According to this configuration, when the sliding copper pad is brought into contact with the pair of base materials, at least a part of the end portion of the movable member is brought into contact with the base material with urging force, so that in the direction of the welding line. Leakage of molten slag or weld metal can be reliably prevented even in joints with different plate thicknesses.

(4) A support portion that is attached to the side of the backing metal main body portion and supports the movable member is further provided.
The urging member urges the movable member toward the base material with respect to the support portion.
Sliding copper pad for welding according to (3).
According to this configuration, the movable member and the urging member can be easily attached to the side of the metal fitting main body portion 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 portion of the movable member can be made smaller, and leakage of molten slag or weld metal can be reliably prevented.

(6) The block is attached to the backing main body so that the ends of the plurality of blocks project toward the base from the contact surface of the backing main body with the base. The sliding copper pad for welding according to (5), further comprising a plurality of urging members for urging toward the base metal.
According to this configuration, by abutting the sliding copper pad against the pair of base materials, at least one end of a plurality of blocks abuts against the base material with urging force, so that in the direction of the weld line. Leakage of molten slag or weld metal can be reliably prevented even in joints with different plate thicknesses.

(7) The variable member is composed of a plate-shaped elastic member that is long along the longitudinal direction of the pad body.
The elastic member is attached to the side of the backing body so that the end thereof protrudes toward the base from the contact surface of the backing body with the base. The sliding copper pad for welding according to (2).
According to this configuration, the variable member can be deformed following the surface of the base metal, and leakage of molten slag or weld metal can be prevented even in a joint portion having a difference in plate thickness in the welding line direction.

(8) The following member has a predetermined width and a predetermined thickness.
The upper end of the follower member is located above the molten slag bath or the molten metal bath.
The lower end of the follower member is located above the lower end of the pad body.
The sliding copper pad for welding according to any one of (1) to (7).
According to this configuration, the cooling performance for cooling the molten metal can be ensured. In addition, 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 in the main body of the pad.
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 transfer the heat of the molten slag bath or the molten metal bath to the backing main body side via the insulating member, and can suppress the influence of heat with a simple structure.

(11) The detection terminal is fitted into a concave groove penetrating in the thickness direction in the upper part of the pad main body portion 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 over the entire opening on the base metal side of the concave groove via the insulating member.
According to this configuration, it is possible to prevent the molten slag from adhering to the detection terminal.

(12) The upper end portion of the following member is located above the lower end portion 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 the weld metal provided below the upper end of the following member can be reliably detected.

(13) The pad main body includes a base portion and at least one rotating member rotatably supported with respect to the base portion.
The rotating member has a contact surface that extends in the longitudinal direction along the groove portion and is in contact with the base metal.
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 metal having different plate thicknesses in the left-right direction.

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

(15) The sliding copper pad for welding according to (13) or (14), wherein the base 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), and
Welding torch and
A molten slag bath detector that detects the 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 equipped with the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moving along the groove portion.
To prepare
Welding equipment.
According to this configuration, it is possible to weld joint portions having different plate thicknesses in the welding line direction while preventing leakage of molten slag or weld metal.
can.

(17) The sliding copper pad for welding according to any one of (1) to (15) is arranged toward the groove portion between the pair of base materials.
The groove is filled with flux, and the welding wire is supplied from the tip of the contact tip.
The contact tip is moved along the groove portion, and the sliding copper pad for welding is slid and moved along the groove portion for welding.
Welding method.
According to this configuration, it is possible to weld joint portions having different plate thicknesses in the welding line direction 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 so as to form a molten slag bath or a molten metal bath and slides along the groove.
The main body of the backing and
A detection terminal of a molten slag bath detector which is attached to the upper part of the metal fitting body portion via an insulating member and can detect the welding voltage of the molten slag bath or the molten metal bath.
To prepare
Sliding copper pad for welding.
According to this configuration, the detection terminal can transfer the heat of the molten slag bath or the molten metal bath to the backing main body side via the insulating member, and can suppress the influence of heat with a simple structure.

(19) The detection terminal is fitted into a concave groove penetrating in the thickness direction in the upper part of the metal fitting main body portion 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 over the entire opening on the base metal side of the concave groove via the insulating member.
According to this configuration, it is possible to prevent the molten slag from adhering to the detection terminal.

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

2 Groove 3 Base material 3D Lower base material 3S Serpin processing part 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 Running Cart 18 Detection terminal 18a Surface 18b Lower end 30 Sliding copper pad for welding 31 Rotating member 32 Contact surface 33 Attached surface 34 Support shaft 38 Water cooling path 39 Sliding bearing 40 Batting body 41 Base 41a Opposing surface 41b Lower end 47 Recessed groove 48 Insulating member 60, 70 Slag leakage prevention part 61 Movable member (following member)
62 Support block (support part)
63 Bounce member 64 Block 64a End 64b Upper end 64c Lower end 65 Cover (support)
71 Variable member (elastic member)
71a End 100 Electroslag Welder

Claims (17)

A sliding copper pad for welding that is arranged facing a groove between a pair of base materials so as to form a molten slag bath or a molten metal bath and slides along the groove.
The main body of the backing and
An at least one follower member provided on at least one side of the pad body and capable of moving so that an end facing the base material abuts or approaches the base material.
A sliding copper pad for welding. The following member is a movable member that can move in a direction that approaches or separates 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 claim 1. The movable member is attached to the base material with respect to the backing body so that the end portion of the movable member projects toward the base material from the contact surface of the backing body with the base material. Further equipped with urging members to urge towards,
The sliding copper pad for welding according to claim 2. Further provided with a support portion attached to the side of the pad body portion to support the movable member.
The urging member urges the movable member toward the base material with respect to the support portion.
The sliding copper pad for welding according to claim 3. The sliding copper pad for welding according to any one of claims 2 to 4, wherein the movable member includes a plurality of blocks arranged side by side in the welding line direction along the groove portion. Each block is used as a base material with respect to the backing body so that the ends of the plurality of blocks project toward the base material from the contact surface of the backing body with the base material. The sliding copper pad for welding according to claim 5, further comprising a plurality of urging members for urging toward each other. The variable member is composed of a plate-shaped elastic member that is long along the longitudinal direction of the pad body.
The elastic member is attached to the side of the backing body so that the end thereof protrudes toward the base from the contact surface of the backing body with the base. The sliding copper pad for welding according to claim 2. The following member has a predetermined width and a predetermined thickness.
The upper end of the follower member is located above the molten slag bath or the molten metal bath.
The lower end of the follower member is located above the lower end of the pad body.
The sliding copper pad for welding according to any one of claims 1 to 7. A water cooling path is provided in the pad body.
The sliding copper pad for welding according to any one of claims 1 to 8. 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 portion of the metal fitting main body via an insulating member.
The sliding copper pad for welding according to any one of claims 1 to 9. The detection terminal is fitted into a concave groove penetrating in the thickness direction in the upper part of the pad body portion via the insulating member.
The sliding copper pad for welding according to claim 10, wherein the surface of the detection terminal on the base metal side is formed over the entire opening on the base metal side of the concave groove via the insulating member. The upper end of the follower member is located above the lower end of the detection terminal.
The sliding copper pad for welding according to claim 10 or 11. The pad body comprises 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 the longitudinal direction along the groove portion and is in contact with the base metal.
The sliding copper pad for welding according to any one of claims 1 to 12. The rotating member further has a mounted surface exposed to the side of the pad body portion.
The following member is attached to the mounted surface of the rotating member.
The sliding copper pad for welding according to claim 13. The sliding copper pad for welding according to claim 13 or 14, wherein the base and the rotating member each have a water cooling path. The sliding copper pad for welding according to any one of claims 1 to 15,
Welding torch and
A molten slag bath detector that detects the 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 equipped with the sliding copper pad for welding, the welding torch, the molten slag bath detector, and the flux supply device and moving along the groove portion.
To prepare
Welding equipment. The sliding copper pad for welding according to any one of claims 1 to 15 is arranged toward the groove portion between the pair of base materials.
The groove is filled with flux, and the welding wire is supplied from the tip of the contact tip.
The contact tip is moved along the groove portion, and the sliding copper pad for welding is slid and moved along the groove portion for welding.
Welding method.

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