CN114682903A

CN114682903A - Sliding copper pressure plate for welding, welding device and welding method

Info

Publication number: CN114682903A
Application number: CN202111349049.4A
Authority: CN
Inventors: 山口幸祐; 山崎圭; 横山孝视; 户田亮
Original assignee: Kobe Steel Ltd
Current assignee: Kobe Steel Ltd
Priority date: 2020-12-25
Filing date: 2021-11-15
Publication date: 2022-07-01
Anticipated expiration: 2041-11-15
Also published as: CN114682903B; JP7389013B2; KR102582885B1; JP2022102788A; KR20220092782A

Abstract

The invention provides a sliding copper pressure plate for welding, a welding device and a welding method, which can prevent leakage of molten welding slag or molten metal even in a joint part with plate thickness difference in a welding line direction. A sliding copper platen (30) for welding, which is disposed so as to face a bevel portion (2) between a pair of base materials (3), is provided with: a platen main body (40); and at least one movable member (61) that is provided on at least one side of the platen main body (40) and that can move so that an opposing surface (41a) that opposes the base material (3) comes into contact with or approaches the base material (3).

Description

Sliding copper pressure plate for welding, welding device and welding method

Technical Field

The invention relates to a sliding copper pressure plate for welding, a welding device and a welding method.

Background

Up-standing welding methods such as electroslag welding and electric arc welding are widely used as high-efficiency construction methods for vertical joints in ship building and welding of large structures such as petroleum tanks.

In particular, electroslag welding, which uses joule heat of molten slag as a heat source, generates heat not in an exposed arc in the molten slag, and melts a welding wire and a base metal, so that arc radiant heat is not generated, and generation of smoke and spatter is small, thereby improving the working environment. Further, since the molten slag shields the weld metal from the atmosphere, a shielding gas is not required, the shielding effect does not deteriorate even if the plate thickness is large, and the penetration of nitrogen or the like present in the atmosphere into the molten metal can be effectively prevented regardless of the plate thickness, so that there is an advantage that the mechanical deterioration of the weld metal does not occur.

In addition, it is known that in both of the electroslag welding method and the electric arc welding method, a small-sized water-cooled sliding copper platen having a length enough to cover a molten slag bath or a molten metal bath is used. As a result, the welding torch and the carriage are raised by the guide rail, the chain, or the like in accordance with the progress of welding, and the water-cooled sliding copper pressure plate is moved along the welding line together with the welding torch and the carriage, thereby enabling long welding of several tens of meters.

Patent document 1 discloses the following: in vertical electric arc welding in which a sliding copper pressure plate is brought into contact with a groove surface of an object to be welded to perform welding, when the sliding copper pressure plate is pressed in a plate thickness direction to perform welding, a pressing force for pressing a lower portion of the sliding copper pressure plate is 1/4-1/2 of a pressing force for pressing a central portion, and leakage of molten metal and molten slag is prevented also in a joint portion where two-stage groove processing is performed on base metals having different plate thicknesses in a welding line direction. Specifically, the leakage of the weld metal and the molten slag from the gap formed between the molten metal and the sliding copper platen when the sliding copper platen passes through the end surface of the secondary groove portion of the upper base material and is in a state of being perpendicular along the surface of the upper base material is prevented.

Patent document 2 discloses the following: in electroslag welding, in order to weld while maintaining the depth of a slag bath at a predetermined depth, a molten slag bath detector is provided on the upper portion of a sliding copper platen, and the depth of the slag bath is detected from a welding voltage detected by a detection terminal of the molten slag bath detector.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2003-236667

Patent document 2: japanese patent laid-open publication No. 2016-215214

Disclosure of Invention

Problems to be solved by the invention

Fig. 19 shows a process of welding a secondary groove processed portion 3S of a base material 3 having a plate thickness difference in a welding line direction by using a sliding copper pressure plate 200 in a conventional electroslag welding method. When the sliding copper platen 200 advances from the lower base material 3D to the secondary groove-formed portion 3S of the upper base material 3U, the upper end of the sliding copper platen 200 rises along the secondary groove-formed portion 3S (see fig. 19 b), and thus a gap S1 is formed between the sliding copper platen 200 and the base material 3. Further, when the welding progresses and the sliding copper platen 200 becomes parallel to the secondary groove-machined portion 3S (see fig. 19 c), a gap portion S2 is formed between the upper portion of the sliding copper platen 200 and the upper base material 3U. Therefore, there is a possibility that the molten slag or the molten metal leaks from the gap portions S1 and S2 to interrupt welding, and improvement is required. On the other hand, when the sliding copper platen 200 is in a state of being along the surface of the upper base material 3U (see fig. 19 d), the gap portion S3 is generated between the lower portion of the sliding copper platen 200 and the secondary groove processed portion 3S, but when the molten slag and the weld metal have solidified, the molten slag and the weld metal do not leak.

In the method described in patent document 1, leakage of molten metal and molten slag from the gap S3 in the state of fig. 19 (d) is not considered for the purpose of preventing leakage of molten metal and molten slag from the gap S1 and S2 in the state of fig. 19 (b) and 19 (c).

The present invention has been made in view of the above-described problems, and an object thereof is to provide a sliding copper pressure plate for welding, a welding apparatus, and a welding method, which can prevent leakage of molten slag or molten metal even in a joint portion where there is a difference in plate thickness in a welding line direction.

Means for solving the problems

The above object of the present invention is achieved by the following configurations.

[1] A sliding copper platen for welding, which is disposed opposite to a bevel portion between a pair of base materials to form a molten slag bath or a molten metal bath, and slides along the bevel portion,

the sliding copper pressure plate for welding is provided with:

a platen body portion; and

and at least one following member provided on at least one side of the platen main body portion and movable so that an end portion facing the base material comes into contact with or approaches the base material.

[2] A welding device, wherein,

the welding device is provided with:

[1] the sliding copper pressure plate for welding;

a welding torch;

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; and

and a traveling carriage that mounts the sliding copper platen for welding, the welding torch, the molten slag bath detector, and the flux supply device and moves along the bevel portion.

[3] A method of welding, wherein,

disposing the sliding copper platen for welding of [1] toward a bevel portion between a pair of base materials;

filling flux into the bevel portion and supplying a welding wire from a tip of the contact tip; and

and moving the contact tip along the bevel portion, and sliding the welding slide copper platen along the bevel portion to perform welding.

Effects of the invention

According to the sliding copper platen for welding, the welding apparatus, and the welding method of the present invention, since at least one following member that can move so that the end portion facing the base material comes into contact with or approaches the base material is provided on at least one side of the platen main body portion, it is possible to prevent leakage of molten slag or weld metal even in a joint portion where there is a difference in plate thickness in the weld line direction.

Drawings

Fig. 1 is a diagram showing a schematic configuration of an electroslag welding apparatus according to an embodiment of the present invention.

Fig. 2 is a perspective view of the sliding copper pressure plate for welding according to the first embodiment as viewed from the back side.

Fig. 3 is a perspective view of the sliding copper pressure plate for welding shown in fig. 2, as viewed from the front side.

Fig. 4 is a front view of the welding slide copper pressure plate shown in fig. 2.

Fig. 5 is a plan view of the sliding copper pressure plate for welding shown in fig. 2.

Fig. 6 is a sectional view taken along line VI-VI of fig. 5.

Fig. 7 is a partially cut side view of the dross leakage prevention part of the sliding copper pressure plate for welding shown in fig. 2.

Fig. 8 is a cross-sectional view showing a state in which a copper platen and a sliding copper platen for welding are disposed at a bevel portion of a butt joint.

Fig. 9 is a cross-sectional view showing a state in which a copper platen and a sliding copper platen for welding are disposed on the surface of a base material having an angle.

Fig. 10 is a side view showing a process of welding a joint portion having a difference in plate thickness in a welding line direction by the sliding copper pressure plate for welding of the first embodiment.

Fig. 11 is a diagram showing a configuration example of the molten slag bath detector.

Fig. 12 is a perspective view of the sliding copper platen for soldering showing a state in which the detection terminal is removed from the platen main body.

Fig. 13 is a perspective view of the sliding copper pressure plate for welding according to the second embodiment as viewed from the back side.

Fig. 14 is a perspective view of the dross leakage prevention part of the sliding copper pressure plate for welding shown in fig. 13.

Fig. 15 is an enlarged plan view of the dross leakage prevention part of the sliding copper pressure plate for welding shown in fig. 13.

Fig. 16 is a side view showing a process of welding a joint portion having a difference in plate thickness in a welding line direction by the sliding copper pressure plate for welding of the second embodiment.

Fig. 17 is a schematic front view of various modifications of the sliding copper platen for welding according to the first embodiment.

Fig. 18 is a schematic front view showing various modifications of the sliding copper pressure plate for welding.

Fig. 19 is a side view showing a process of welding a joint portion having a difference in plate thickness in a welding line direction by a conventional sliding copper pressure plate for welding.

Description of reference numerals:

2 bevel edge part

3 base material

3D lower base material

3S two-stage groove processing part

3U upper parent metal

4 welding torch

5 contact tip

6 welding wire

7 molten welding slag bath

9 molten metal

12 welding flux

13 molten welding slag bath detector

14 flux supply device

16 running trolley

18 detection terminal

18a surface

18b lower end portion

30 sliding copper pressure plate for welding

31 rotating member

32 contact surface

33 to-be-mounted surface

34 support the shaft part

38 water cooling path

39 plain bearing

40 pressing plate body part

41 base part

41a opposed surface

41b lower end

47 groove

48 insulating member

60. 70 welding slag leakage prevention part

61 Movable Member (follow Member)

62 support block (support)

63 force applying component

64 block

64a end portion

64b upper end portion

64c lower end

65 cover (support)

71 variable component (elastic component)

71a end portion

100 electroslag welding device.

Detailed Description

Hereinafter, one embodiment of a sliding copper platen for welding, a welding apparatus using the sliding copper platen for welding, and a welding method according to the present invention will be described in detail with reference to the drawings. The sliding copper pressure plate for welding according to the present invention can be applied to either electroslag welding or electric arc welding, but the following description will take electroslag welding as an example.

< Structure of welding device >

First, an electroslag welding apparatus using a sliding copper platen 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, an arrow Z indicates a direction (vertical direction) along a welding line of the base materials, an arrow X indicates a thickness direction of the base materials, and an arrow Y indicates a direction in which the pair of base materials are arranged, that is, a horizontal direction along the surface of the base materials. Therefore, the upper side means the upper side with respect to the paper surface of fig. 1, the lower side means the lower side with respect to the paper surface of fig. 1, the front side means the left side with respect to the paper surface of fig. 1, and the rear side means the right side with respect to the paper surface of fig. 1. In fig. 2, similarly, assuming a state in which the welding sliding copper platen is disposed on the surface of the base material, arrow Z indicates the longitudinal direction of the welding sliding copper platen (the longitudinal direction of the platen body), arrow X indicates the thickness direction of the welding sliding copper platen (the thickness direction of the platen body), and arrow Y indicates the width direction of the welding sliding copper platen (the width direction of the platen body).

As shown in fig. 1, an electroslag welding apparatus 100 of the present embodiment includes a fixed copper platen 1, a sliding copper platen 30 for welding, a welding torch 4, a molten slag bath detector 13, a flux supply device 14, a flux supply control device 15, a traveling carriage 16, and a traveling carriage control device 17.

In the electroslag welding apparatus 100, a fixed copper pressure plate 1 is disposed on the back side of the grooves of a pair of base materials 3 as steel plates, and a sliding copper pressure plate 30 for welding is disposed on the front side of the grooves. Here, a backing plate made of heat-resistant ceramic may be used instead of the copper platen 1 on the back side. The front side sliding copper platen 30 for welding is a copper platen that slides in the vertical direction, and is water-cooled as will be described later. However, the material of the sliding copper platen for welding 30 may be replaced by other than copper.

Welding torch 4 supplies welding wire 6 with welding current 8 supplied from a welding power supply not shown, and thereby welds base material 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 feeds flux 12 into the molten slag bath 7. Since the flux 12 melts and becomes molten slag, the amount of the molten slag bath 7 can be increased by charging the flux 12.

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

The traveling carriage 16 is mounted with a sliding copper platen 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, and moves in the upward direction (the arrow Z direction). That is, since the traveling carriage 16 moves integrally with the sliding copper platen 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, the relative positional relationship of the respective devices does not change. The traveling carriage 16 is lifted to perform welding in the upward direction.

The traveling vehicle control device 17 increases or decreases the traveling speed of the traveling vehicle 16 to control the operation of the traveling vehicle 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 pressure plate 1, and the sliding copper pressure plate 30 for welding, and the welding wire 6 is fed into the molten slag bath 7 formed in the groove. The welding current 8 flows from the welding wire 6 through the molten slag bath 7 to the molten metal 9. 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 progresses simultaneously with the molten welding wire 6 and the base material 3.

As the welding progresses, the molten metal 9 is cooled to become the weld metal 10, a part of the molten slag bath 7 becomes a molten slag layer formed between the copper platen 1 and the weld metal 10 and between the sliding copper platen for welding 30 and the weld metal 10, and the molten slag layer is cooled to become the solidified slag 11. In this way, since a part of the molten slag bath 7 becomes the solidified slag 11 covering the bead surface, the molten slag bath is consumed as the welding progresses, and the depth Ls of the molten slag bath 7 gradually decreases. In order to compensate for the decrease in the molten slag bath 7, it is necessary to additionally charge flux 12 that is melted to become the molten slag bath 7.

The amount of the solidified slag 11 covering the bead surface varies depending on the bead width and the width of the welding groove. The amount of solidified slag 11 also varies depending on the degree of adhesion between the copper platen 1 and the sliding copper platen for welding 30 and the cooling state. Therefore, the amount of solidified slag 11 is not constant, and the amount of flux 12 to be charged for keeping the depth Ls of the molten slag bath 7 constant also needs to be changed. However, since the depth Ls of the molten slag bath 7 is not known, the depth Ls of the molten slag bath 7 fluctuates when the amount of the flux 12 charged is not appropriate.

In this embodiment, the control is performed to make the depth Ls of the molten slag bath 7 constant. Here, the constant is not limited to the case where the depth Ls of the molten slag bath 7 is always a single value, and includes the case where the depth Ls of the molten slag bath 7 shows a value within a constant range in consideration of an error. That is, the depth Ls of the molten slag bath 7 is controlled to maintain a predetermined depth.

The first requirement for keeping the depth Ls of the molten slag bath 7 constant is to control the 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 to a predetermined length. A second requirement for making the depth Ls of the molten slag bath 7 constant is that the welding current 8 has a predetermined relationship with respect to a reference current value determined from the wire feeding speed, that is, the traveling carriage control device 17 controls the traveling speed of the traveling carriage 16 so that the reference current value is equal to the welding current 8. At the same wire feed speed, (Ld + Ls) has a correlation with the welding current 8, and the traveling speed of the traveling carriage 16 is controlled by the traveling carriage control device 17 so that the reference current value becomes equal to the welding current 8, whereby (Ld + Ls) is kept constant.

The control of the wire length Ld can be performed by detecting the molten slag bath 7 by the molten slag bath detector 13, which will be described in detail later.

< sliding copper pressure plate for welding >

As shown in fig. 2 to 7, the sliding copper platen 30 for welding includes: a platen main body 40 having a base 41 and a pair of

rotary members

31, 31 rotatably held by the base 41; and a pair of slag leakage prevention portions 60 provided on both sides of the platen main body portion 40 and preventing leakage of molten slag or molten metal at joint portions where there is a difference in plate thickness in the weld line direction.

The base portion 41 of the platen main body portion 40 is formed in a substantially rectangular plate shape, and a pair of arcuate holes 42 that are open toward the facing surface 41a side of the base material 3 and the lateral side in the width direction are formed at both ends in the longitudinal direction (Z direction).

The opposed surface 41a of the base portion 41 between the pair of arcuate holes 42 is a recess 43 slightly recessed at the center in the width direction. A detection terminal 18 of a molten slag bath detector 13 described later is disposed above the recess 43. Inside the base portion 41 of the platen main body portion 40, a pair of bottomed holes 44 are formed substantially parallel to each other in the Z direction from the lower end portions on the inner sides in the width direction of the pair of arc-shaped holes 42. The open end of the bottomed hole 44 is sealed by a stopper not shown.

Further, a pair of through holes 45 (see fig. 8 and 9) communicating with the bottomed holes 44 are formed in the lower portion of each bottomed hole 44 from the opposite side of the recess 43. The upper portions of the bottomed holes 44 communicate with each other through a communication hole 45A extending in the width direction (see fig. 4). The bottomed hole 44, the pair of through holes 45, and the communication hole 45A form a part of a water cooling passage 38 through which cooling water flows, which will be described later.

The pair of rotary members 31 are substantially cylindrical members having a substantially sector-shaped cross section, and have two flat contact surfaces 32 and mounted surfaces 33 extending in the longitudinal direction with a part of the outer peripheral surface thereof cut away. The two contact surfaces 32 and the mounted surface 33 are formed parallel to the axial center CL of the rotary member 31 and orthogonal to each other. The width of the contact surface 32 is, for example, 5 to 15 mm. As shown in fig. 6, a small-diameter support shaft portion 34 is formed at both axial end portions of the rotary member 31, and the support shaft portion 34 is rotatably fitted to a slide bearing 39 screwed to a base portion 41 of the platen main body portion 40. The sliding bearing 39 is formed in a substantially fan-shaped 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 mounting surface 33 (see fig. 3).

Further, a bottomed hole 35 is formed in the rotary member 31 from one end side (lower end in fig. 6) in the axial direction. A stopper 36 is fixed to a female screw 35a formed at the opening end of the bottomed hole 35 to seal the bottomed hole 35. The bottomed hole 35 is provided with a pair of through holes 37 that communicate with the bottomed hole 35 from the opposite side of the contact surface 32 in the radial direction. The bottomed 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 rotary member 31 flows.

The bottomed hole 35, the pair of through holes 37 of the rotary member 31, and the bottomed hole 44, the pair of through holes 45, and the communication hole 45A of the base 41 are connected by a connecting pipe 50 (see fig. 2) to form the water cooling passage 38. The rotating member 31, the platen body 40, and the slag leakage prevention unit 60 are cooled by the water cooling path 38, thereby solidifying the molten slag or the molten metal and preventing the molten slag or the molten metal from leaking out from between the base material 3 and the sliding copper platen for welding 30.

Here, as shown in fig. 5, a length L1 of a perpendicular line from the center O of the rotary member 31 to the contact surface 32 is set longer than a length L2 of a perpendicular line from the center O of the circular-arc hole 42 of the base portion 41 (the same as the center O of the rotary member 31) to the distal end surface 41c of the opposed surface 41a of the base portion 41 other than the recess 43 (L1 > L2).

Therefore, the pair of rotary members 31, in which the support shaft portions 34 at both axial end portions are fitted to the slide bearings 39 and rotatably fitted to the arcuate holes 42 of the base portion 41, are assembled in a state in which the contact surfaces 32 thereof protrude from the distal end surface 41c of the base portion 41 by L1-L2. That is, the pair of rotary members 31 are supported by the platen main body 40 such that the contact surfaces 32 thereof protrude from the opposed surfaces 41a of the base 41 toward the base material 3 by L1-L2.

As shown in fig. 6, a length L3 of the sliding bearing 39 having a substantially D-shaped outer shape perpendicular to the plane surface 39a from the center O of the rotary member 31 (which is the same as the center of the support hole of the sliding bearing 39) is the same as a length L2 of the sliding bearing 39 perpendicular to the distal end surface 41c from the center O of the circular arc-shaped hole 42 of the base 41. 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 fig. 2 to 5 and 7, the slag leakage prevention unit 60 includes: a plurality of (6 in the embodiment shown in the drawings) block bodies 64 of a substantially rectangular parallelepiped shape, which are arranged side by side so as to be capable of sliding contact with each other in the up-down direction along the bevel portion 2; a plurality of support shafts 66 each having one end attached to the opposite side of the end 64a of each of the plurality of blocks 64; a support block 62 that supports the plurality of blocks 64 via a plurality of support shafts 66; a plurality of biasing members 63 such as coil springs that abut against a head portion 66a formed at the other end of the support shaft 66 and press the plurality of blocks 64 in a direction of abutting against or approaching the base material 3; and a cover 65 that supports the end portions of the plurality of biasing members 63 and is attached to the support block 62.

The support block 62 is formed long in accordance with the total length in the vertical direction (Z direction in fig. 7) of the plurality of blocks 64, and is screwed to the mounting surface 33 of the rotary member 31 provided on the side of the platen main body portion 40. In the support block 62, a plurality of support holes 67 are formed in parallel in the longitudinal direction of the welding sliding copper pressure plate 30 in accordance with the number of blocks 64, and the support shafts 66 are slidably fitted into the support holes 67 penetrating in the thickness direction of the welding sliding copper pressure plate 30.

Therefore, the biasing members 63 having the counter base material side end portions supported by the cover 65 bias the block bodies 64 via the support shafts 66, and the end portions 64a of the block bodies 64 are in a state of projecting toward the base material 3 side from the contact surfaces 32 as contact surfaces of the pair of rotary members 31 in the normal state.

In this way, since each block 64 is pressed in a direction of abutting against or approaching the base material 3 by the elastic force of the biasing member 63, in a state where the sliding copper pressure plate for welding 30 is disposed on the front side of the grooves of the pair of base materials 3, an end 64a of each block 64 facing the base material 3 is positioned at a position close to the base material 3 in abutment with the base material 3 or in abutment with the head 66a of the support shaft 66 and the support block 62. Then, the sliding copper pressure plate 30 for welding slides in the welding line direction, so that the blocks 64 follow the surface shape of the base material 3 and move in the thickness direction (X direction) perpendicular to the longitudinal direction of the pressure plate main body 40.

That is, the plurality of blocks 64 constitute a following member of the present invention that can move so that the end 64a facing the base material 3 comes into contact with or approaches the base material 3. The plurality of blocks 64 constitute a movable member 61 movable in a direction approaching the base material 3 or separating from the base material 3. That is, in the present embodiment, the end portions 64a of the plurality of blocks 64 constitute the end portions of the follow-up member and the end portions of the movable member 61 of the present invention.

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.

Note that the movable member 61 may be configured by a single member as long as it functions as the following member and can move in a direction in which the base material 3 approaches or separates from the base material 3, but by dividing the movable member 61 into a plurality of blocks 64 as in the present embodiment, when a joint portion having a difference in plate thickness in the vertical direction passes, the gap between the base material 3 and the movable member 61 can be made smaller, and leakage of molten slag can be prevented more reliably.

In the present embodiment, the plurality of blocks 64 move in the thickness direction perpendicular to the longitudinal direction of the platen main body 40, but may move in an oblique direction including an X-direction component or a Y-direction component as long as the blocks move in a direction approaching the base material 3 or separating from the base material 3.

The plurality of blocks 64, the support shafts 66, and the support blocks 62 are made of a metal material having good heat conductivity (in the present embodiment, the blocks 64 and the support blocks 62 are made of copper, and the support shafts 66 are made of stainless steel), and the support blocks 62 are attached in contact with the rotary member 31 having the water cooling passage 38, so that the slag leakage prevention unit 60 can be cooled by the platen main body portion 40.

The slag leakage prevention unit 60 is also required to be directly cooled, but there is no space in the slag leakage prevention unit 60, and it is difficult to provide the water cooling passage 38. Therefore, in order to further enhance the cooling effect, it is preferable to provide the water cooling passage 38 in a portion of the platen main body 40 close to the slag leakage prevention unit 60.

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 air pressure, or may be manually pressed. When the block 64 is pressed by gravity, magnetic force, or the like other than the urging member 63, an appropriate mechanism can be adopted.

The block 64 has a predetermined width (Y direction in fig. 5) and a predetermined thickness (X direction in fig. 5). Since the block 64 has a predetermined width and a predetermined thickness, sufficient cooling performance for more rapidly cooling the molten slag can be obtained. For example, the width is preferably 5mm or more, and the thickness is preferably 4mm or more. The upper limit of the width and the thickness is not particularly limited, but if it is too large, the width is preferably 15mm or less, and the thickness is preferably 10mm or less, because the weight becomes large and the driving force for moving the sliding copper pressure plate 30 for welding along the groove becomes large.

The upper end 61b of the movable member 61, i.e., 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, i.e., the lower end 64c of the lower block 64, is located above the lower end 41b of the platen body 40. This prevents molten slag from leaking out from between the base material 3 and the sliding copper platen for welding 30 over the entire length of the platen main body 40 in the Z direction.

Here, the position of the molten slag bath 7 will be described, and when the height of the molten slag bath 7 is automatically controlled by detecting the height of the molten slag bath 7 or the like, the position refers to the position of the upper surface of the molten slag bath 7 that is determined in advance, and when the height of the molten slag bath 7 is not automatically controlled, the position refers to the position of the upper surface of the molten slag bath 7 that is determined in advance as a target by a welding operator.

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 platen body 40, i.e., the upper end portion 39c of the upper slide bearing 39, and the lower end portion 64c of the movable member 61 is located above the lower end portion of the contact surface of the platen body 40, i.e., the lower end portion 39d of the lower slide bearing 39.

< Effect of sliding copper pressure plate for welding >

Next, welding using the sliding copper platen 30 for welding will be described with reference to fig. 8 to 10.

First, a case where the base materials 3 having a difference in plate thickness in the left-right direction are welded will be described.

Since the pair of rotating members 31 are rotatable with respect to the base portion 41 of the platen main body 40, the contact surfaces 32 of the pair of rotating members 31 rotate following the surface 3a of the base material 3, and even if there is an angular difference between the surfaces 3a of the base materials 3 (see fig. 9) and even if there is a difference in the left-right direction plate thickness between the surfaces 3a of the base materials 3, the contact surfaces 32 of the pair of rotating members 31 and the surface 3a of the base material 3 can be in contact with each other on the ground.

Thus, the molten slag receiving portion is defined by the copper platen 1, the bevel portion 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 rotary member 31, and the recess 43 (the facing surface 41a) of the base portion 41.

While the pair of rotary members 31 are arranged in a state where the contact surfaces 32 thereof are in surface contact with the surface 3a of the base material 3 and the rotary members 31 and the base 41 are cooled from the inside by flowing cooling water through the water cooling passage 38, the welding is performed by filling the gap portion 2 with the flux 12, supplying the wire 6 from the tip of the contact tip 5, moving the contact tip 5 along the gap portion 2, and sliding the sliding copper platen for welding 30 along the gap portion 2.

Since the contact surfaces 32 of the pair of rotary members 31 are in surface contact with the surface 3a of the base material 3, the molten slag can be reliably prevented from leaking from between the base material 3 and the contact surfaces 32 of the pair of rotary members 31 even if there is a difference in plate thickness, an angle difference, or the like in the left-right direction between the two base materials 3. Further, the long welded portion can be welded by the small and light sliding copper platen 30 for welding.

Next, as shown in fig. 10, a case will be described where

base materials

3D and 3U having a two-stage groove processed portion 3S, which have a difference in plate thickness in the welding line direction (vertical direction), that is, a difference in plate thickness, are welded. When the

base materials

3D and 3U having different plate thicknesses are welded, a gap is generated between the surface 3a of the

base materials

3D and 3U and the sliding copper pressure plate 30 for welding in the secondary groove processed portion 3S, and molten slag may leak from the gap.

The sliding copper platen for welding 30 is disposed on the front surface 3a of the base material 3D on the lower side of the copper platen 1 on the back surface thereof by abutting the contact surfaces 32 of the pair of rotating members 31. At this time, as shown in fig. 10 (a), each block 64 protruding from the support block 62 toward the base material side by the elastic force of the biasing member 63 is pushed in against the elastic force of the biasing member 63 by abutting the end 64a thereof against the surface 3a of the base material 3D, and is arranged so as to follow the surface shape of the base material 3D without a gap from the base material 3D. Therefore, even if welding is performed in this state, the molten slag or the molten metal does not leak from the gap between the end 64a of the block 64 and the surface 3a of the base material 3D.

When the welding progresses along the welding line, as shown in fig. 10 (b), the upper end portion of the sliding copper pressure plate for welding 30 reaches the secondary groove 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 blocks 64 move so as to abut against or approach the base material 3 following the shape of the secondary groove 3S, thereby closing the gap between the secondary groove 3S and the end 64a of each block 64. Hereinafter, as shown in fig. 8 (c) and (d), the gap formed between the base material 3 including the secondary groove processing portion 3S and the block 64 of the sliding copper pressure plate for welding 30 is blocked by the slag leakage prevention portion 60, and the base material 3 having a plate thickness different in the vertical direction can be welded satisfactorily so as to prevent leakage of the molten slag or the molten metal.

< Structure of molten slag bath detector >

Next, the structure 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 setting device 20, and a comparator 21. The detection terminal 18 is made of a copper alloy as a conductive metal. The detection terminal 18 detects a voltage of a part of the welding voltage when contacting the molten slag bath 7.

The differential amplifier 19 of the molten slag bath detector 13 may receive the voltage of the detection terminal 18 and the voltage of the sliding copper platen for welding 30 as the base metal voltage, but since the sliding copper platen for welding 30 may be in contact with the molten slag bath 7 and may have a voltage to ground, it is preferable to ground the voltage received by the sliding copper platen for welding 30 as shown in fig. 11.

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 platen main body 40 via an insulating member 48 over a large area. Specifically, the detection terminal 18 is fitted into a square U-shaped groove 47 formed in the upper portion of the base portion 41 of the platen main body portion 40 through an insulating member 48 made of ceramic or the like and penetrating in the thickness direction (X direction). As shown in fig. 5, the rectangular surface 18a of the detection terminal 18 on the base material 3 side is located substantially at the same position as the deepest portion of the recess 43 of the base portion 41 in the thickness direction, and is formed flat over the entire area of the base material 3 side opening of the concave groove 47 via the insulating member 48.

The detection terminal 18 is attached to the platen main body portion 40 by a support body 49 fixed to the base portion 41 by a bolt so as to be insulated from the base portion 41.

Therefore, the detection terminal 18 is indirectly cooled by the platen main body portion 40, which is water-cooled via the insulating member 48, on the lower surface of the rectangular shape and both side surfaces in the width direction (Y direction) of the rectangular shape, so that the heat radiation property of the detection terminal 18 is improved, the temperature rise of the detection terminal 18 is prevented, 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 portion of the platen main body 40 via the insulating member 48, the detection terminal 18 can suppress the influence of heat with a simple configuration.

Further, since the surface 18a of the detection terminal 18 on the base material 3 side is formed flat, adhesion of the dross is suppressed. Even if a small amount of the slag adheres to the surface 18a, the slag adhering to the surface 18a is thin and remelted at the next welding, and therefore has substantially no influence on the welding.

As shown in fig. 4, the upper end of the movable member (follow-up member) 61, that is, the upper end 64b of the upper block 64 is located at a height h above the lower end 18b of the detection terminal 18. This makes it possible to reliably detect the melting voltage of the molten slag provided below the plurality of blocks 64.

The differential amplifier 19 receives the voltage at the detection terminal 18 and the ground voltage as input, and outputs the difference between the two voltages. The contact determination reference signal setter 20 outputs, as a reference signal, a voltage of such a degree that it is not erroneously detected due to noise, for example, a voltage of about half the voltage detected when the detection terminal 18 is in contact with 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, and determines that the detection terminal 18 is in contact with the molten slag bath 7 when the output signal of the differential amplifier 19 is larger than the reference signal of the contact determination reference signal setter 20. The generated signal is sent to the flux supply control device 15, and the supply and stop of the flux 12 are performed by the flux supply device 14. 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 controlled to be maintained at the 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, and therefore the voltage of the detection terminal 18 is 0V.

In addition, in the molten slag bath detector 13, when the value of the reference signal of the contact determination reference signal setter 20 is small, there is a possibility that accurate determination cannot be made due to the state of welding, external noise, or the like. Therefore, in the case of oscillating the welding torch 4, the molten slag bath detector 13 may be provided with a low-pass filter between the differential amplifier 19 and the comparator 21 in order to prevent erroneous detection.

(second embodiment)

Next, a sliding copper platen for welding according to a second embodiment will be described with reference to fig. 13 to 16.

The slag leakage prevention unit 70 included in the sliding copper platen 30 for welding of the present embodiment includes a variable member 71 that is provided on both sides of the platen main body 40 and is deformable in accordance with the shape of the base material 3. The variable member 71 is a thin plate-like elastic member having heat resistance and flexibility, for example, formed of carbon fiber, and is elongated in the longitudinal direction (Z direction) of the platen main body 40.

The variable member 71 is sandwiched between the holding plate 73 and the pressing plate 72, and is integrally assembled by a screw 74. The pressing plate 72 is a plate-shaped member that is bent at a position closer to the base material side than the holding plate 73 and has a substantially V-shaped cross section, and when the variable member 71 is assembled to the holding plate 73 while being sandwiched therebetween, the end portion 71a of the variable member 71 is bent so as to face the inside of the welding slide copper platen 30. The pressing plate 72 is fixed to the mounting surface 33 of the rotary member 31 by screws 75 together with the variable member 71 and the holding plate 73. The end 71a of the variable member 71, which is a contact surface with the base material 3, protrudes toward the base material 3 side from the opposite surface 41a of the base portion 41, which is a contact surface with the base material 3, of the platen main body portion 40.

Next, the function of preventing leakage of molten slag or molten metal will be described with reference to fig. 16. In fig. 16, the variable member 71 is shown in a grid in order to easily understand the deformation of the variable member 71.

The sliding copper platen for welding 30 is disposed on a side surface (front side) 3a of the base material 3D on the lower side of the copper platen 1 on the back surface thereof, with a contact surface 32 of the rotating member 31 in contact therewith. At this time, as shown in fig. 16 (a), an 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, elastically deforms in accordance with the surface shape of the base material 3D, and comes into contact with the base material 3D in a state where the gap therebetween is closed. In this way, since welding is performed in a state where there is no 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.

When the welding progresses along the welding line, as shown in fig. 16 (b), the upper end portion of the sliding copper pressure plate for welding 30 reaches the secondary groove 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 deforms to follow the shape of the secondary bevel processed portion 3S, so that a gap is not formed between the secondary bevel processed portion 3S and the variable member 71. Hereinafter, as shown in fig. 16 (c) and (d), since the gap formed between the base material 3 including the secondary groove portion 3S and the sliding copper pressure plate 30 for welding is closed by the variable member 71, the base material 3 having a thickness different in the vertical direction can be welded satisfactorily without leakage of molten slag or molten metal.

Therefore, variable member 71 of the present embodiment also constitutes a following member of the present invention that can move so that end 71a facing base material 3 comes into contact with or approaches base material 3.

Other structures and operations are the same as those of the first embodiment.

The present invention is not limited to the embodiments and the modifications described above, and modifications, improvements, and the like can be appropriately made.

For example, in the above embodiment, the platen main body 40 is configured to include the pair of rotary members 31, and the support block 62 of the dross leakage prevention unit 60 and the dross leakage prevention unit 70 are attached to the attached surface 33 of the rotary member 31, but the present invention is not limited thereto, and may be attached to the side surface of the base portion 41 of the platen main body 40.

In addition, in the case where the platen main body 40 does not have a rotating member, the support block 62 of the slag leakage prevention unit 60 and the slag leakage prevention unit 70 may be attached to the side surface of the base portion 41 of the platen main body 40 in the same manner.

The support block 62 of the slag leakage prevention unit 60 may be formed integrally with the base portion 41 of the platen main body portion 40 by extending the base portion 41 in the width direction.

In the present invention, the dross leakage prevention unit 60 and the dross leakage prevention unit 70 can be used in combination, and the dross leakage prevention unit 60 can be configured by combining different types of blocks 64 as desired.

Fig. 17 shows various modifications of the sliding copper pressure plate 30 for welding using the slag leakage prevention unit 60 according to the first embodiment.

In fig. 17 (a), a movable member 61 formed of a plurality of blocks 64 is disposed on one end surface 40c of the platen main body 40 (i.e., the surface 33 to which the rotary member 31 is attached or the side surface of the base portion 41), and a movable member 61 formed of a single member is disposed on the other end surface 40 d.

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 platen main body 40.

In fig. 17 (c), a plurality of movable members 61 including movable members 61 formed of blocks 64 having different sizes are arranged in two rows on both end surfaces 40c and 40d of the platen main body 40, and the heights of the blocks 64 in the two rows are made different. Thus, even if the slag leakage prevention unit 60 is leaked from the inner side in the width direction by any chance, the leakage can be reliably prevented by the slag leakage prevention unit 60 on the outer side in the width direction. In addition, the effect of aligning the edges of the weld beads can be obtained.

In fig. 17 (d), the movable member 61 constituted by the plurality of blocks 64 is disposed so as to be laterally asymmetrical.

Fig. 18 is a modification in which the slag leakage prevention unit 60 provided with the movable member 61 and the slag leakage prevention unit 70 provided with the variable member 71 are arranged as a single unit or in combination.

In fig. 18 (a), one slag leakage prevention unit 60 is disposed on one end surface 40c of the platen main body 40, and prevents leakage from the side of the one end surface 40c of the platen main body 40.

In fig. 18 (b), the slag leakage prevention unit 60 is disposed on one end surface 40c of the platen main body 40, and the slag leakage prevention unit 70 is disposed on the other end surface 40 d.

In fig. 18 (c), two rows of the dross leakage prevention units 60 are arranged on both

end surfaces

40c, 40d of the platen main body 40 so as to be vertically offset.

In fig. 18 (d), the slag leakage prevention unit 60 and the slag leakage prevention unit 70 are arranged in two rows on one end surface 40c of the platen main body 40, and the slag leakage prevention unit 70 is arranged on the other end surface 40 d. The slag

leakage prevention portions

60 and 70 need not be parallel to the end surfaces 40c and 40d of the platen main body 40 (Z direction), but may be arranged inclined at an angle of 45 ° or less with respect to the Z direction.

In fig. 18(e), the slag leakage prevention unit 60 is disposed in the upper half and the slag leakage prevention unit 70 is disposed in the lower half of the opposite end surfaces 40c and 40d of the platen main body 40.

In fig. 18(f), the dross leakage prevention unit 60 is disposed on both

end surfaces

40c, 40d of the platen main body 40, and the dross leakage prevention unit 70 is disposed outside the dross leakage prevention unit 60.

As described above, the following matters are disclosed in the present specification.

(1) A sliding copper platen for welding, which is disposed opposite to a bevel portion between a pair of base materials to form a molten slag bath or a molten metal bath, and slides along the bevel portion,

the sliding copper pressure plate for welding is provided with:

a platen body portion; and

According to this configuration, leakage of molten slag or weld metal can be prevented even in the joint portion where there is a difference in plate thickness in the weld line direction.

(2) The sliding copper pressure plate for welding according to the item (1), wherein,

the following member is a movable member that can move in a direction of approaching to or separating from the base material, or a variable member that can be deformed in accordance with the shape of the base material.

According to this configuration, the leakage of the molten slag or the weld metal can be prevented even in the joint portion where the difference in plate thickness exists in the weld line direction by the movable member or the variable member.

(3) The sliding copper pressure plate for welding according to the item (2), wherein,

the sliding copper pressure plate for welding further includes a biasing member that biases the movable member toward the base material with respect to the pressure plate main body so that the end of the movable member protrudes toward the base material side than a contact surface of the pressure plate main body with the base material.

According to this configuration, since the sliding copper pressure plate is brought into contact with the pair of base materials, at least a part of the end of the movable member is brought into contact with the base materials with a biasing force, it is possible to reliably prevent leakage of molten slag or weld metal even in a joint portion where there is a difference in plate thickness in the weld line direction.

(4) The sliding copper pressure plate for welding according to item (3), wherein,

the sliding copper platen for welding further includes a support portion attached to a side of the platen main body portion and supporting the movable member,

the biasing member biases the movable member toward the base material with respect to the support portion.

According to this configuration, the movable member and the biasing member can be easily attached to the side of the platen main body portion by the support portion.

(5) The sliding copper platen for welding according to any one of (2) to (4),

the movable member includes a plurality of blocks arranged side by side in the welding line direction.

According to this configuration, the gap between the base material and the end of the movable member can be made smaller by dividing the movable member into the plurality of blocks, and leakage of molten slag or weld metal can be reliably prevented.

(6) The sliding copper pressure plate for welding according to the item (5), wherein,

the sliding copper pressure plate for welding further includes a plurality of biasing members that bias the blocks toward the base material with respect to the pressure plate main body so that ends of the blocks protrude toward the base material from a contact surface of the pressure plate main body with the base material.

According to this configuration, since the sliding copper pressure plate is brought into contact with the pair of base materials, at least one end of the plurality of blocks is brought into contact with the base materials with a biasing force, it is possible to reliably prevent leakage of molten slag or weld metal even in a joint portion where there is a difference in plate thickness in the weld line direction.

(7) The sliding copper pressure plate for welding according to the item (2), wherein,

the variable member is formed of a plate-like elastic member elongated in the longitudinal direction of the platen main body,

the elastic member is attached to a side of the platen body such that the end of the elastic member protrudes from a contact surface of the platen body with the base material toward the base material.

According to this configuration, the variable member can be deformed in conformity with the surface of the base material, and leakage of molten slag or weld metal can be prevented even in a joint portion where there is a difference in plate thickness in the weld line direction.

(8) The sliding copper pressure plate for welding according to any one of (1) to (7),

the following member has a predetermined width and a predetermined thickness,

an upper end portion of the follow-up member is located above the molten slag bath or the molten metal bath, and a lower end portion of the follow-up member is located above a lower end of the platen main body.

According to this structure, the cooling performance for cooling the molten metal can be ensured. Further, the leakage of the molten metal can be prevented over the entire length of the sliding copper platen for welding.

(9) The sliding copper pressure plate for welding according to any one of (1) to (8),

a water cooling path is provided in the pressure plate main body.

According to this configuration, the sliding copper platen for welding can be efficiently cooled by the cooling water supplied to the water cooling passage.

(10) The sliding copper platen for welding according to any one of (1) to (9),

a detection terminal of a molten slag bath detector capable of detecting a welding voltage of the molten slag bath or the molten metal bath is attached to an upper portion of the platen main body portion via an insulating member.

According to this configuration, the detection terminal can transmit the heat of the molten slag bath or the molten metal bath to the platen main body side via the insulating member, and the influence of the heat can be suppressed with a simple configuration.

(11) The sliding copper pressure plate for welding according to item (10), wherein,

the detection terminal is fitted into a groove penetrating in a thickness direction in an upper portion of the platen main body via the insulating member,

the surface of the detection terminal on the base material side is formed by the insulating member over the entire base material side opening of the recess.

With this configuration, adhesion of molten slag to the detection terminal can be prevented.

(12) The sliding copper pressure plate for welding according to the item (10) or (11), wherein,

the upper end of the follow-up member is located above the lower end of the detection terminal.

According to this configuration, the melting voltage of the molten slag or the weld metal provided below the upper end portion of the follow-up member can be reliably detected.

(13) The sliding copper pressure plate for welding according to any one of (1) to (12),

the platen main body portion 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 a longitudinal direction along the bevel portion and is capable of contacting the base material.

According to this configuration, the molten slag or the weld metal can be prevented from leaking from the base material having a difference in plate thickness in the left-right direction by the rotating member.

(14) The sliding copper pressure plate for welding according to the item (13),

the rotating member further includes a mounting surface exposed to a side of the platen body, and the follow-up member is mounted on the mounting surface of the rotating member.

According to this configuration, even when the base material having a difference in plate thickness in the left-right direction has a difference in plate thickness in the weld line direction, it is possible to prevent leakage of molten slag or weld metal.

(15) The sliding copper pressure plate for welding according to the item (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 efficiently cooled by the cooling water supplied to the water cooling passage.

(16) A welding device, wherein,

the welding device is provided with:

(1) the sliding copper platen for welding according to any one of (1) to (15);

a welding torch;

According to this configuration, leakage of molten slag or weld metal can be prevented, and a joint portion having a difference in plate thickness in the weld line direction can be welded.

(17) A method of welding, wherein,

the welding method comprises the following steps:

disposing the sliding copper platen for welding according to any one of (1) to (15) toward a bevel portion between a pair of base materials;

filling flux into the bevel portion and feeding a welding wire from a tip of the contact tip; and

(18) A sliding copper platen for welding, which is disposed opposite to a bevel portion between a pair of base materials to form a molten slag bath or a molten metal bath, and slides along the bevel portion,

the sliding copper pressure plate for welding is provided with:

a platen body portion; and

and a detection terminal of the molten slag bath detector, which is attached to an upper portion of the platen main body portion via an insulating member and is capable of detecting a welding voltage of the molten slag bath or the molten metal bath.

(19) The sliding copper pressure plate for welding according to the item (18), wherein,

the detection terminal is fitted into a groove penetrating in a thickness direction in an upper portion of the pressure plate main body via the insulating member,

the surface of the detection terminal on the base material side is formed in the entire range of the base material side opening of the groove via the insulating member.

(20) The sliding copper pressure plate for welding according to the item (18) or (19), wherein,

the upper end of the following member is located above the lower end of the detection terminal. According to this configuration, the melting voltage of the molten slag or the weld metal provided below the upper end portion of the follow-up member can be reliably detected.

Claims

1. A sliding copper platen for welding, which is disposed opposite to a bevel portion between a pair of base materials to form a molten slag bath or a molten metal bath, and slides along the bevel portion,

the sliding copper pressure plate for welding is provided with:

a platen body portion; and

2. The sliding copper platen for welding according to claim 1,

3. The sliding copper platen for welding according to claim 2,

4. The sliding copper platen for welding according to claim 3,

5. The sliding copper platen for welding according to any one of claims 2 to 4,

the movable member includes a plurality of blocks arranged side by side in a welding line direction along the bevel portion.

6. The sliding copper platen for welding according to claim 5,

the sliding copper pressure plate for welding further includes a plurality of biasing members that bias the blocks toward the base material with respect to the pressure plate main body so that end portions of the blocks protrude toward the base material from a contact surface of the pressure plate main body with the base material.

7. The sliding copper platen for welding according to claim 2,

8. The sliding copper platen for welding according to claim 1,

the following member has a predetermined width and a predetermined thickness,

an upper end portion of the follow-up 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 platen main body.

9. The sliding copper platen for welding according to claim 1,

a water cooling path is provided in the pressure plate main body.

10. The sliding copper platen for welding according to claim 1,

11. The sliding copper platen for welding according to claim 10,

12. The sliding copper platen for welding according to claim 10 or 11,

13. The sliding copper platen for welding according to claim 1,

14. The sliding copper platen for welding according to claim 13,

the rotating member further includes a mounting surface exposed to a side of the platen body,

the following member is attached to the attached surface of the rotating member.

15. The sliding copper platen for welding according to claim 13 or 14,

the base and the rotating member each have a water cooling path.

16. A welding device, wherein,

the welding device is provided with:

a sliding copper pressure plate for welding as set forth in any one of claims 1 to 15;

a welding torch;

17. A method of welding, wherein,

the welding method comprises the following steps:

disposing the sliding copper platen for welding according to any one of claims 1 to 15 toward a bevel portion between a pair of base materials;