JPH02197376A - Welding equipment for joining materials - Google Patents

Abstract

PURPOSE:To prevent the occurrence of weld defects and a cutting accident by arranging a plural-head welding machine and a one-head welding machine to perform butt welding on preceding material and succeeding material and performing welding until the plural-head welding machine passes, by the prescribed quantity, a welding finishing point of the one-head welding machine. CONSTITUTION:The one-head welding machine 5 is fitted to a rotatable screw shaft 10A provided on a pedestal 9 and moves in the direction orthogonal to a material transfer line along a guide bar 11 by a driving device 12. A welding head 5A of the welding machine 5 starts welding from the prescribed position (a) of one end of material and performs welding up to the prescribed position (b) of the plural-head welding machine 6 side and is stopped and sent back and returned to the starting point (a). The plural-head welding machine 6 is fitted to a screw shaft 10B and moves in the direction orthogonal to the material transfer line along the guide bar 11 by a driving device 13. Plural welding heads 6A are arranged at prescribed intervals and a welding head 6A1 of the left end starts welding from the prescribed position C' and performs welding until it passes, by the prescribed quantity, the welding finishing point (b) of the welding machine 5. By this method, the weld defects at the welding finishing point are prevented from being caused at both ends of a joint and cutting accident is prevented surely.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a material joining welding device used to continuously process material coils in electric resistance welded steel pipe manufacturing equipment, forge welded steel pipe manufacturing equipment, etc. be.

[Conventional technology]

Conventionally, in electric resistance welded steel pipe manufacturing equipment, - During boat fishing, a single steel strip coil is unwound and smoothed, and then the tip of the steel strip coil is cut by a down cut shear, and then sent to the pipe manufacturing process. However, the pipe-making process was carried out for each steel strip coil, which had the disadvantage of extremely low efficiency.

Therefore, in recent years, it has been considered to weld and connect the tail end of the leading steel band coil (preceding material) and the tip of the trailing steel band coil (following material) to continuously form pipes.

[Problem to be solved by the invention]

However, in order to shorten welding time, a multi-head welding machine with multiple sets of welding heads arranged in a line along the welding line is used, and the tail end of the leading material and the leading end of the trailing material are automatically welded in one layer. The head on the rear side in the welding direction welds until the welding start point on the head on the front side in the welding direction.
Welding defects are likely to occur at the edges of the plate, resulting in welding end points that cause material to break during the looping and forming processes. In addition, the welded portion tends to protrude from the end face of the material at the welding end point, and the protruding welded portion may damage the tool in the edge mirror.

[Purpose of the invention]

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to shorten material splicing time and improve work efficiency.

[Means to solve the problem]

The welding device for joining materials of the present invention includes a multi-head welding machine 6 and one head that can be driven independently from each other for butt-welding the tail end of the preceding material P and the tip of the succeeding material P2 on both sides of the material transfer line. A welding machine 5 is arranged, and the one-head welding machine 5 starts welding with the welding head 5A from a predetermined position a on one end of the material and welds it to a predetermined position on the multi-head welding machine 6 side, and then reverse feeds the welding machine 5. In addition, in the multi-head welding machine 6, the welding heads 6A are arranged along the welding line at a predetermined interval L2, and the welding heads 6A of the five most used head welding machines are arranged to weld the material. Welding is started from a predetermined position C' at the other end, and welding is performed until the welding head 6A of the five one-head welders passes the welding end point of the one-head welder 5 by a predetermined distance. This configuration achieves the above object.

[For production]

The welding head 5A of the one-head welding machine 5 is connected to the welding head 6A of the multi-head welding machine 6 from one side of the material transfer line.
move closer to each other while welding from the other side of the material transfer line, and the l-head welder 5 moves from the welding start point a to the welding end point, then stops and reverses so as not to interfere with the multi-head welding a6. Although returning to the original welding start point a, the multi-head welder 6 moves while welding from the welding start points c, c' until it passes the welding end point of the one-head welder 5 by a predetermined distance. Therefore, the tail end of the leading material P, and the trailing material P
2 is welded inward from both ends of the material by the one-head welder 5 and the multiple-head welder 6, so welding defects at the welding end point will not occur at both ends of the joint.

In addition, the minimum width W of the material to be welded is, for example, when the total number of welding heads is 4, the present invention in which 1 head + 3 heads are used is smaller than the 2 heads + 2 heads that weld simply while moving closer, and the welding time is correspondingly smaller. This is advantageous in shortening the time.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

On the material transfer line, there are an inlet guide device 1 and an outlet guide device 2, and a leading material P whose both ends are guided by these guide devices 1.2 and centered and abutted.
Hydraulic-operated inlet clamping devices 3 and outlet clamping devices 4 are provided for clamping the tail end of the + and the leading end of the trailing material P2, respectively. Welding the tail end of the clamped leading material P1 and the leading end of the trailing material P2 along the welding line 1
A head welder 5 and a multi-head welder 6 are provided, and adjacent to said welder 5.6, respectively, a preceding material P+
A side presser metal 7.8 is provided to press down the end surface of the trailing material P2.

The l-head welding machine 5 is threaded onto a rotatable screw shaft 10A provided on a pedestal 9 and slidably fitted onto a guide bar 11, and driven by a drive device 12 provided on the pedestal 9 to drive the screw shaft 10. A can be moved along the guide bar 11 in a direction perpendicular to the material transfer line.

In this one-head welding machine 5, the welding head 5A starts welding from a predetermined position a of one end of the material (on the left side in the figure) and welds to a predetermined amount 2b in six examples of multiple-head welding machines. In order not to interfere with the welding machine 6, it is provided so that welding is stopped and the welding is reversed to return to the original welding starting point a.

Further, the multi-head welding machine 6 is screwed onto a rotatable screw shaft 10B provided on a pedestal 9, and slidably fitted onto a guide bar 11, and driven by a drive device 13 provided on the pedestal 9 to drive the screw shaft. 10B along the guide bar 11 in a direction perpendicular to the material transfer line.

In this multi-head welding machine 6, a plurality of sets of welding heads 6A (3 & [l in the embodiment) are arranged at predetermined intervals along the welding line, and of the welding heads 6A used, the most opposite 1 head welds. The welding head on the welding machine 5 side (the middle welding head in the example) starts welding from a predetermined position C on the other end of the material (on the right side in the figure), and In the example, the welding head (on the left end in the figure) starts welding from a predetermined position C' and continues welding until it passes the welding end point C of the L-head welding machine 5 by a predetermined distance.

The welding end point of the one-head welding machine 5 is set in the opposite direction after the welding machine 5 stops welding, so that when the welding machines 5.6 start welding at the same time, the welding machines 5.6 approach each other but do not interfere. The welding machine 6 is set to be separated from the welding machine 6 by a predetermined distance when the welding starts.

The side holding metals 7.8 are respectively attached to the ends of the rods of the pneumatic cylinder cylinders 4.15, and are capable of straddling the end faces of the leading material P1 and the trailing material P2 on the material transfer line and holding down the end faces. It has become.

In the above configuration, the welding head 5A of the one-head welding machine 5 is guided by the guide bar 11 by the simultaneous operation of the drive devices 12 and 13, and the welding head 5A of the one-head welding machine 5 welds the materials P+ and one end of Pz (left side in the figure).
The welding head 6A2 of the multi-head welding machine 6 (number of heads used is 2) moves inward from the material P+.
, Pg moves inward for welding from the other end (right side in the figure), and the welding head 6A+ moves inward for welding from a position 2 pitches away from the welding head 6Az, and is clamped by the clamping device 3.4. The tail end of the leading material P1 and the leading end of the trailing material P2 are welded together.

By the way, by controlling the drive device 12.13, 1
After the head welder 5 moves from the welding start point a to the welding end point, it is stopped so as not to interfere with the multi-head welder 6, and then returned to the original welding start point a. Also, since the multi-head welding machine 6 moves from the welding start point C1C' until it passes the welding end point of the one-head welding machine 5 by a predetermined distance, the tail end of the preceding material P1 and the tip of the succeeding material P2 are welded by one head. machine 5
The material is welded from both ends by a multi-head welding machine 6,
The one-head welding machine 5 welds the joint from one end to the middle, and the multi-head welding machine 6 welds the other end of the joint to weld the remaining part welded by the one-head welding machine 5. Weld defects at the end points do not occur at either end of the joint.

In addition, side holding metals 7.8 are provided at the welding starting points a and c of the l-head welder 5 and the multi-head welder 6, so that the welded part does not protrude from the end surface of the material at both ends of the joint. It is possible to reduce damage to the tool in the edge mirror in the post-process.

Since the side holding metals 7.8 are provided at the welding starting points a and c, multi-head welding is performed between the side holding metals 7.8 and the welding head 5A of the l-head welding machine 5 that returns to the original welding starting points a and c. Although interference with the welding head 6A of the machine 6 may occur, this can be avoided by raising the welding heads 5A, 6A.

Next, the minimum width of material to be welded by the welding apparatus of the present invention will be explained with reference to FIG.

Welding head 1 of single-head welding machine 5 and multi-head welding machine 6
Minimum welding length for assembly 0: A+, minimum distance when one-head welding machine 5 and multi-head welding machine 6 are closest: Ll,
Welding head spacing for multiple head welding a6: Lz (L
+, Lz is a fixed value, and 2 is a changeable value), the minimum material width W is expressed by the following formula.

That is, when only the l-head welding machine 5 is used, W=2.
On the other hand, in the case of the present invention that uses a single-head welder 5 and a multiple-head welder 6, when the number of welding heads of the multiple-head welder 6 is 1 (the total number of welding heads at this time is 2), W = 1 + + L I+ lt・・・・・・
(1) As in the embodiment, when the number of welding heads used in the multi-head welding rod 6 is 2 (the total number of welding heads at this time is 3), W = 1! , I+LI+1! ,1
+Lt・・・・・・・・・・・・(2) When the number of welding heads used in the multi-head welding machine 6 is 3 (the total number of welding heads at this time is 4), W=1! , +L, +1. +2XL,...(3)
When the number of welding heads used in the multi-head welding machine 6 is 4 (the total number of welding heads at this time is 5), W-j! I +LI +p, +3xl,...
(4) If two two-head welding machines with a welding head spacing of L2 are used, and the total number of welding heads is 4, and both of these machines are moved inward from both ends of the material, then
The formula for determining the minimum material width W in this case is the same as the formula (3) above, but as shown in Figure 5, if Lx>i+, even if the re-welder reaches L1 just before interference, the welding distance will be set at L2. Since welding is not completed for all of the welding heads that have been welded, the condition L>Lx is required to prevent unwelded portions from occurring. On the other hand, in the present invention of one head + multiple heads, the welding is performed by the multiple head welder passing through the welding end point of the one head welder, and the remaining part of the welding by the one head welder is welded. Since this eliminates the numerical constraints on This is also advantageous in reducing welding time.

For example, jL = 100 mm, L+ = 250 tr
Assuming that a, Lz = 450mm, the minimum material width W is according to the above formulas (1), (2), (3), and (4): ■ When the total number of welding heads is 2, W = 450 mm ■ When the total number of welding heads is 3 , W = 9QQmm ■ When the total number of welding heads is 4, W = 1350mm ■ When the total number of welding heads is 5, W =
Since it is 1900mm, the maximum material width is 1950mm.
To this extent, it is appropriate to select 4 (1 head + 3 heads) for the total number of welding heads.

Also, since L, > z, unwelded parts will occur in the above cases 2 and 2 heads and 2 heads and 3 heads, respectively, but in the case of 2 heads + 3 heads and 2 heads + 4 heads (this invention), There is no such problem and welding can be completed satisfactorily.

〔Effect of the invention〕

As described above, the present invention welds a material from both ends using a one-head welding machine and a multi-head welding machine, and moreover, welds the material by passing through the welding end point of the one-head welding machine. Since the parts can be welded, welding defects at the welding end point will not occur at both ends of the joint, and cutting accidents at the welded part can be reliably prevented. Therefore, continuous pipe manufacturing processing etc. can be performed, and production efficiency can be greatly improved.

Furthermore, the welding time can be shortened by minimizing the minimum width of the material to be welded, thereby improving the efficiency of welding work.

Furthermore, since an effective combination of a one-head welding machine and a multi-head welding machine is sufficient, it is effective in reducing equipment costs and simplifying equipment.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figures 2 and 3 are
The figures are a plan view and a left side view, FIG. 4 is a conceptual diagram showing the welding method, and FIG. 5 is an explanatory diagram of the operation. Pl... Leading material, P2... Following material, 1... Inlet guide device, 2... Outlet guide device, 3...・・Entrance side clamp device, 4・・
...Exit clamp device, 5...1 head welding machine, 5A...welding head, 6...multiple head welding machine, 6A... Welding head, 7.8
...Side presser metal, 9... Frame,
10A, IOB...Screw shaft, 11...
... Guide bar, 12.13 ... Drive device, 1
4.15...Pneumatic cylinder. 1 head ÷ 3 throat (this invention) 2 heads 2 heads

Claims (1)

[Claims] (1) A multi-head welding machine and a single-head welding machine that can be driven independently of each other are arranged on both sides of the material transfer line to butt weld the tail end of the preceding material and the leading end of the trailing material, and the single-head welding machine is provided so that the welding head starts welding from a predetermined position on one end of the material, welds to a predetermined position on the multi-head welding machine side, and then moves backward, and in the multi-head welding machine, the welding head starts welding at a predetermined position on the welding line. are arranged at predetermined intervals along A welding device for joining materials, characterized in that the welding head is configured to perform welding until the welding head passes a welding end point of the one-head welding machine by a predetermined distance.