JPS5966998A - Jig for welding piping - Google Patents

Abstract

PURPOSE:To provide a titled jig which permits an exact welding operation and improves working efficiency in an operation which welds the end faces of pipings in press contact with each other by the mechanism wherein the outside circumferences of both pipes are restrained and the end faces are brought into press contact with each other in axial alignment. CONSTITUTION:The 1st piping 1 and the 2nd piping 2 having the end faces machined and chamfered at a right angle to the axial line are held into contact with each other at the end faces, are put, in this state, into the recesses of an upper block 12 and a lower block 13 and are tightened by means of bolts 18. Screw rods 16 for tightening are turned and tightened while the axial lines of the pipes are aligned to each other by guide bars 14, 15 whereby both pipe ends are correctly brought into press contact with each other. The pipe ends are manually or automatically welded in this state. The bolts 18 are loosened and the jigs are removed after welding and the welding operation is completed. The exact welding of the pipes by the simple operation is accomplished by using such jig.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a pipe welding jig, and in particular to a jig for welding pipes, which enables quick and reliable centering of joints and crushing of pipe end faces using OT functions, and has good workability. Regarding piping welding jigs.

[Technical background of the invention]

Conventional means for centering and fixing pipes when connecting pipes by welding are shown in FIGS. 11 to 3.

In the conventional example shown in No. 1 I￥1, the end surfaces of the first pipe 1 and the second pipe 2 to be connected thereto are made to face each other, and this state is maintained after centering both pipes 1 and 2 one row. Both piping 1
, 2, a U-shaped jig 3.3 having leg-like portions 3A, 3A that abuts the outer circumferential surfaces of the plurality of intra-sinus pipes 1.
．． Connect pipe 1 by fillet welding so as to straddle the joint of pipe 2.
2, and then perform temporary welding 5 on the welding surface 4 at the appropriate locations, and clean the welded surfaces of piping 1.2.
After setting, the leg portion 3A of the jig 3.3...
3A was cut and removed, and then main welding was performed on the circumference of the connecting portion to connect the pipes 1°2.

In the conventional example shown in FIG. 9, center the piping on the other side using the above-mentioned retaining screw 7 (T).
The pipe connecting portion is welded, the clamp 9 is removed, and then the main welding is performed on the circumference.

Furthermore, in the conventional example shown in FIG.
The end faces of the four parts 1 (l and the convex part 11) which fit into each other are made into a stepped structure that can be fitted into each other by 11ρ (centering is performed from C, then Q). This is where actual welding is performed.

[Problems with background technology]

In the conventional example shown in Fig. 1, while centering the first and second piping 1.2, jigs 3, 3, etc. are welded (fixed by D. et al.
It takes a lot of man-hours to assemble the bath welding f'J to a high degree of precision, and the tack welding requires considerable skill as well as the temporary welding. It is necessary to cut and remove the jigs 3, 3, . . . at the end of one welding, which has disadvantages such as that the work is not easy.

In addition, in the conventional example shown in Fig. 2, centering is performed by tightening the fixing screw 7 attached to the outer circumference of the pipe, so it takes a very long time to perform centering with high precision, and Since it is fixed on the piping by tightening, it is inevitable that it will damage the outer circumferential surface of the piping.

Furthermore, in the conventional example shown in FIG.
(, 1 and convex part 1), and the longer the piping, the more man-hours are required for the machining. It is necessary to caulk the convex portion 11 to fix it, and there is a drawback that it takes a long time to fix the centering ridge.

As a drawback common to each of the above conventional examples, the first and second
Even if the piping can be centered and fixed, it is not possible to maintain the surface pressure between the end faces of the piping in the axial direction of the piping in a wave-like manner.If the piping is made of aluminum, it may cause poor fusion or Problems remain, such as the occurrence of excessive pro-pole.

[Purpose of the invention]

The present invention eliminates the shortcomings of the prior art, allows for quick and reliable centering of pipes without any need for skill, and D) allows the end faces of the pipes to be closely spaced with a predetermined gap between them. It is an object of the present invention to provide a piping welding jig that can be fixed with a hand and can be used not only for manual welding but also for semi-automatic and fully automatic welding.

[Summary of the invention]

To achieve the above object, the present invention provides a welding section between a first pipe and a second pipe connected four times to the first pipe by manual, semi-automatic, or gold-metal welding.
It has a pair of upper blocks and lower blocks facing each other across the peripheral surfaces of the piping and the second piping, and the kite rod and one hoof are used to connect these facing upper blocks and the lower 8B blocks to each other. They are connected by threaded rods, and the upper and lower corresponding blocks are used as fixed marks by sandwiching the piping, and when tightening the centering l and f of the piping, tighten the internal threads (so that the end faces of the piping are @N- or at a specified distance). This allows for fixation while maintaining the gap.

[Practice of invention? ++11 Hereinafter, the embodiments of the present invention will be described with reference to FIGS. 4 to 6. Parts common to PJ1 figure to LA3 figure 1 are marked with ID1-
Add a sign and enjoy 1.

According to the present invention, a pair of upper blocks 12 face each other while straddling the outer peripheral surfaces of the first west tvl and the second pipe 2.
, 12, and a pair of lower blocks 13゜13, and the upper blocks 12, 12 and the lower blocks 13, 13i have kites on both sides when viewed from above.
, 14, and 15, 15 are connected to each other by inserting tightening screw rods 1fi, 17 into the center between these kite rods, and this tightening is done by inserting screw rods 1fi, 17 into the center between these kite rods.
By rotating the upper blocks 12, 12 and the lower blocks 13, 13, the upper blocks 12, 12 and the lower blocks 13, 13 are moved toward and away from each other using the Kaitoi fists 14, 15 as guides.

The upper block J2, 12 and the lower block 13,
By tightening 18 and 18, it is fixed on the pipe 1.2 with the pipe 1.2 interposed therebetween.

Next, I will explain the work in progress.

It (
2l'5 Then Q, stop sound 1 (block 12, I2
and lower block 1;
The upper blocks 1:, 2, and 12 and the lower blocks 13 and 13 are fixed with bolts No. 181.

This leads to the first. The misalignment of the second pipe 1.2 is corrected by the rigidity of Kaito Keyaki 1.4, +5, and further tightened by tightening 1.
- By rotating and adjusting the threaded rods 16 and 17, the end surfaces of the first and second pipes 1.2 can be moved in the direction in which they come into contact with each other, and in the direction in which they are separated.

Therefore, the face required for one corner of welding is 7 or the required dimension flvI! A root gap of t can be obtained.

In the case of a welding method in which temporary t = r ke welding line feed is used, the tacking is done in this state after welding is 73? ) +8. +8
, remove the upper and lower blocks 12 , 12 , 13 , 13 , and make the main contact. In addition, if temporary welding is performed without welding, in the case of force welding, the guide rod 14
, 14. For tightening, by attaching a welding head to the inner surface 1 of the screw fixture 1fi, it is possible to weld without cutting the jig or requiring a skilled person.

C Effect of the invention] As explained above, let's establish this first step. 2. Align the upper and lower blocks with the circumferential surface of the second piping part from below, and then connect the lower blocks to each other. By fixing , a core 1j1 of both pipes t=H is created by 1fn of the guide toy and vol., and the gap between the blocks is made by tightening 1η° by connecting each block n+1 with the screw 4;11. By adjusting the illumination, the piping is i-! Since the gap can be set arbitrarily for the rl'TT's mask, there is no problem with centering! ! There is no need for A-kneading, and the time required for centering is greatly reduced, reducing the number of man-hours by 1y1, and regardless of whether the welding method is manual or automatic, High-quality welding can be obtained, and especially complex piping where a large number of branch pipes cannot be attached can be welded with high resistance by automatically welding long piping.

[Brief explanation of drawings]

Figures 1 to 3 μ Centering of piping during conventional welding 1
．． 1 and 4 are side views of the jig according to the present invention in the centering state, and the fixing means are shown.
Same 3V side view, No. 61! Congratulations to XI. ■・・・：'4＜I l! ! [: i￥, 2...
Iλ2^ (7.12... upper 813 blocks, 1.
Wow...lower block, +4. +5...Kite stick,
1+i, lγ...Tighten 1 for H (2 bars, 18...
・Holt. Applicant's agent Kiyoshi Inomata

Claims (1)

[Claims] In a method in which the welding part of a first pipe and a second pipe connected thereto is sequentially welded by manual, semi-automatic, or fully automatic welding, It has a pair of upper and lower blocks that face each other, and the upper and lower blocks that face each other are connected by a guide P rod and a screw fitting for tightening, and the upper and lower corresponding blocks are fixed by sandwiching the piping. Freely,
＠Tightening is a piping welding jig that makes it possible to fix the dense layer on the end face of the piping by maintaining a predetermined gap using a threaded rod.