JP2637241B2 - Welding equipment for material splicing - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material splicing welding apparatus used for continuously processing a material coil in an electric resistance welded steel pipe manufacturing facility, a forged steel pipe manufacturing facility, or the like. It is.

[Conventional technology]

Conventionally, in an ERW steel pipe manufacturing facility, generally, after a single steel strip coil is rewound and smoothed, the end of the steel strip coil is cut by a downcut shaft, and then fed to a pipe making process. However, since the pipe-forming process is performed for each steel strip coil, the efficiency is extremely low.

Therefore, in recent years, it has been considered that the tail end of the preceding strip steel coil (preceding material) and the tip of the succeeding strip steel coil (subsequent material) are welded and connected by a single-sided automatic welding method to continuously perform pipe making processing. ing.

In this method, even if the conventional single-sided automatic welding method is performed efficiently by submerged arc welding using one or two one-electrode welding machines provided with one electrode, it takes too much welding time, Because we cannot cope with continuous pipe production,
Efficient welding work is inevitably required.

As a method for greatly reducing the required welding time, a method using a multi-electrode welding machine having a plurality of welding machines and arranging the electrodes of each welding machine in a tandem position (one line in the welding line direction) can be considered. .

[Problems to be solved by the invention]

However, if the DC arc voltage is high when three or more electrodes are used simultaneously, such as when three or more one-electrode welding machines are used simultaneously, FIGS.
As shown in the figure, the penetration becomes shallow, the bead becomes flat, and a bead failure that may cause stress cracking starts to appear. When four electrodes are used simultaneously, the disadvantage that the bead failure appears more conspicuously cannot be avoided. Was.

[Object of the invention]

The present invention has been made to solve the above problems,
The purpose is to reliably prevent bead failure.

[Means for solving the problem]

Materials splicing welding apparatus of this invention, as shown in FIG. 1-FIG. 5, butt respectively the tail component and the trailing tip of the material P ₂ preceding material P ₁ disposed butt on the material transfer line a plurality of torch for welding the inlet side clamp device 2A and delivery side clamp device 2B for clamping, these clamping devices 2A, the butt joint of the preceding material P ₁ and the succeeding material P ₂ clamped by 2B in the vicinity of the joint A plurality of arc welding machines in which the electrodes 3a and 4a are arranged in a row in the direction of the welding line are provided, and the material to be welded P ₁ and P ₂ are respectively provided at the clamping portions of the entrance clamping device 2A and the exit clamping device 2B. Only in contact with metal material holding plates 10A, 10A 'and 10B, 10B' that are in contact with
These entry side material holding plates 10A and 10A 'and exit side material holding plate
10B, 10B 'is divided in the width direction of the board and provided insulated between them.
Each of the incoming and outgoing material presser plates 10A, 10B and 10A ', 10B' is characterized in that earth electrodes corresponding to inner and outer torch electrodes in the width direction of the plate are connected to each other. The purpose is achieved.

(Operation)

Incoming material retainers 10A, 10A 'and outgoing material retainers 10B, 10
B 'is insulated by insulating plates 11 and 12 at the clamp portions of the entrance-side clamping device 2A and the exit-side clamping device 2B, and is provided on the incoming and outgoing material pressing plates 10A, 10B and 10A' and 10B ', respectively. The earth electrodes corresponding to the inner and outer torch electrodes in the width direction of the plate are connected and are in contact with the leading material P ₁ and the trailing material P ₂ near the butt joint, respectively, so a problem is caused by a DC arc. The occurrence of magnetic blowing is suppressed. For this reason,
The arc generated between the torch electrode of the arc welding machine and the materials P ₁ and P ₂ is vertical.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

On the material transfer line, inlet side guide apparatus 1A and the exit-side guide device 1B, they are guided at both ends are arranged centering the butt was preceding material P ₁ the tail end and of the trailing material P ₂ A hydraulically operated entrance-side clamp device 2A and an exit-side clamp device 2B for clamping the distal end portions near the butt joint are provided.

Materials respectively on both sides of the transfer line, entering-side clamp device 2A and the outlet side clamp device 1 electrode welder 3 and the multi-electrode welding the butt joint of the trailing material P ₂ and the preceding material P ₁ which is respectively clamped by 2B Welding machine 4 (in the embodiment, one torch electrode is used)
The three DC arc welder) is provided with each number, also, the side presser held down to fit each adjacent to the welding machine 3,4, the end surface of the preceding material P ₁ and the following material P ₂ straddling therebetween Metals 5 and 6 are provided.

Each of the entrance-side clamp device 2A and the exit-side clamp device 2B is provided with a fixed clamp table 7 and a movable clamp table 8 that can be moved with respect to the fixed clamp table 7 and are disposed vertically opposite to each other across a material transfer line. And a clamp cylinder 9 for moving the movable clamp table 8.

One of the clamp portions (fixed clamp table 7) of the entrance-side clamp device 2A and the exit-side clamp device 2B contacts only the material to be welded (the succeeding material P _{2 on the} entrance side, and the preceding material P ₁ on the exit side). Metal incoming material holding plate 10A, 10A 'and outgoing material holding plate 10
B and 10B 'are provided insulated by an insulating plate 11, respectively. The insulating plate 11 is preferably made of a non-magnetic material such as a stainless material.

Further, a plurality of the input side material pressing plates 10A and the output side material pressing plates 10B are respectively provided in a direction perpendicular to the material transfer line (hereinafter, referred to as a plate width direction) via an insulating plate 12 made of the same material as the insulating material 11. In this example, the ground electrode 13 is divided into two), and the material holding plates 10A and 10B each have two ground electrodes 13 corresponding to the torch electrodes 3a and 4a ₃ .
Further, the torch electrodes 4a ₁ and 4a ₂ are attached to the material holding plates 10A 'and 10B'.
Are connected to each other.

The one-electrode welding machine 3 is screwed to a rotatable screw shaft 15 provided on a gantry 14 and slidably fitted on a guide bar 16, and is driven by a driving device 17 provided on the gantry 14.
The torch electrode 3a is provided so as to be movable in the plate width direction along the guide bar 16 through a predetermined position at one end of the material P ₁ , P ₂ and a predetermined position on the multi-electrode welding machine 4 side. The welding is stopped to the position so as not to interfere with the multi-electrode welding machine 4, and the welding is returned to the original welding start point by the reverse feed.

Further, the multi-electrode welding machine 4 is screwed to a rotatable screw shaft 15 ′ provided on the gantry 14 and slidably fitted on a guide bar 16, and is screwed by a driving device 18 provided on the gantry 14. The torch electrode 4a ₂ is provided so as to be movable in the plate width direction along the guide bar 16 via the shaft 15 ', and the torch electrode 4a ₂ closest to the one-electrode welding machine 3 among the torch electrodes 4a to be used is made of the material described above.
Welding is started from a predetermined position at the other end of P ₁ , P ₂ , and the torch electrode 4 a ₁ closest to the electrode welding machine 3 starts welding from a predetermined position to determine the welding end point of the one-electrode welding machine 3. Welding is performed until a predetermined amount passes.

In FIG. 1, below the torch electrode moving line of the electrode welding machine 3 and the multi-electrode welding machine 4 (between the entrance-side clamp device 2A and the exit-side clamp device 2B), it is continuous in the sheet width direction via the support frame 19. A backing money 20 is provided.

In this embodiment, the input-side material pressing plates 10A and 10A 'and the output-side material pressing plates 10B and 10B' are fixed to the fixed-side clamp portion (fixed clamp table 7) of the input-side clamp device 2A and the output-side clamp device 2B. In the above description, an example is provided in which one of the fixed-side clamp unit (fixed clamp table 7) and the movable-side clamp unit (movable clamp table 8) in the entrance-side clamp device 2A and the exit-side clamp device 2B is provided. What is necessary is just to provide it insulated.

Also, an example in which the one-electrode welding machine 3 and the multi-electrode welding machine 4 are used in combination has been described. However, the present invention is not limited to this example, and a plurality of torch electrodes (especially three or more) are arranged in a line in the welding line direction. The present invention is applicable to any DC arc welding machine described above.

In the above configuration, the preceding material P _{1 is} placed on the material transfer line.
The tip of the tail and the following material P ₂ butt arranged centered by inlet side guide apparatus 1A and the outlet side guide apparatus 1B, the backing strip 20 with the clamp according to the inlet side clamp device 2A and the outlet side clamp device 2B and Adhere. The welding operation is performed in such a state. That is, by the simultaneous operation of the driving devices 17 and 18,
The torch electrode 3a of the one-electrode welding machine 3 moves inward in the plate width direction from one end of the materials P ₁ and P ₂ , and the torch electrode 4a ₂ of the multi-electrode welding machine 4 (the number of used electrodes 2) is the material P ₁ to move toward the other end portion of the P ₂ in the plate width direction inside, the torch electrode 4a ₁ is moved toward the plate width direction inner side than where said torch electrode 4a ₂ than the pitch L ₂ apart. Then, the torch electrode 3a of the one-electrode welding machine 3 is moved from the welding start point to the welding end point by the control of the driving devices 17 and 18, and then stopped so as not to interfere with the multi-electrode welding machine 4 and fed back to perform the original welding. Back to the starting point, but the torch electrode 4a ₁ of the multi-electrode welding machine 4 is moved to pass a predetermined amount of welding end point of the first electrode welding machine 3 from the welding start point. Then, a DC voltage is applied between the torch electrodes 3a of the one-electrode welding machine 3 and the torch electrodes 4a ₁ and 4a _{2 of the} multi-electrode welding machine 4 and the materials P ₁ and P ₂ to generate arcs, thereby performing welding. The welding is performed from both ends of the materials P ₁ and P ₂ , welded from one end of the butt joint by the one-electrode welding machine 3 to the middle, and welded from the other end of the butt joint by the multi-electrode welding machine 4. The remaining welding portion of the one-electrode welding machine 3 is to be welded.

In this welding operation, the outlet side to the clamp portion of the clamp device 2B arranged insulated by the insulating plates 11 and 12, in contact only on the outlet side material holding plate 10B, prior material P ₁ in the vicinity of the 10B 'are butt joint, In addition, insulating members 11 and 12 are provided in the clamp portion of the entrance-side clamping device 2A so as to be insulated from each other.
A, 10A 'is in contact only in the trailing material P ₂ near the butt joint, moreover, each of the input, Deryo material holding plate 10A, the 10B, the ground electrode corresponding to the torch electrode 3a, 4a ₃ Are connected to each other, and the input and output material holding plates 10A ', 10A
_Two ground electrodes corresponding to the torch electrodes 4a ₁ and 4a ₂ are connected to B ′. As a result, it is possible to suppress the occurrence of magnetic blowing, which is a problem in the DC arc,
The arc generated between 4a ₁ , 4a ₂ , 4a ₃ and the material P ₁ , P ₂ is vertical and, as shown in FIGS. 6 and 7, the welding of the butt joint of the material P ₁ , P ₂ is normal. You have the speed.

〔The invention's effect〕

As described above, the present invention relates to an entrance-side clamping device and an exit-side clamping device for clamping the tail end of the preceding material and the leading end of the succeeding material arranged near each other on the material transfer line, respectively. A metal material pressing plate that contacts only the material to be welded is provided in the clamp portion in an insulated manner.These material pressing plates are divided in the width direction of the plate and provided in an insulated manner therebetween. Since the ground electrode corresponding to the inner and outer torch electrodes in the width direction of the plate is connected to the presser plate, the arc generated between the torch electrode of the welding machine and the material can be made vertical. Therefore, since a normal welding bead can be obtained at the butt joint of the material and the butt joint of the preceding material and the succeeding material can be welded, a continuous pipe making process can be reliably performed, and the production efficiency is greatly improved. I can do it. Further, it can be easily applied to existing welding equipment for joining materials.

[Brief description of the drawings]

FIGS. 1, 2, and 3 are front, plan, and left side views showing an embodiment of the present invention, FIG. 4 is a schematic enlarged side view of a main part, and FIG. 5 is FIG. 6 and 7 are plan views, sectional views, and FIG. 8 showing welding quality according to the present invention.
FIG. 9 is a plan view and a sectional view showing welding quality according to a conventional example. P ₁ … Primary material, P ₂ …… Subsequent material, 2A …… Incoming clamp device, 2B …… Out clamp device, 3
…… One electrode welding machine, 4 …… Multi electrode welding machine, 3a, 4a ₁ , 4
a ₂ , 4a ₃ ... torch electrode, 7 ... fixed clamp base, 8 ...
… Movable clamp table, 10A, 10A ′ …… Entry side material holding plate, 10
B, 10B '... Outlet material holding plate, 11, 12 ... Insulating plate, 13 ...
... Earth electrode, 20 ... Back metal.

Claims (1)

(57) [Claims] An inlet and outlet clamping device for clamping a tail end of a preceding material and a leading end of a succeeding material arranged on a material transfer line near a butt joint, respectively. A plurality of torch electrodes for welding a butt joint of a preceding material and a succeeding material clamped by a clamp device, a plurality of torch electrodes are arranged in a line in a welding line direction, and a plurality of arc welding machines are provided; A metal material pressing plate that contacts only the material to be welded is provided in the clamp section of the side clamp device in an insulated manner.The incoming material pressing plate and the outgoing material pressing plate are divided in the plate width direction, and the space between them is divided. A welding apparatus for joining materials, characterized in that it is provided insulated and ground electrodes corresponding to inner and outer torch electrodes in the plate width direction are connected to each of the input and output material holding plates.