JP2003039190A - Inspecting method for welding part of automatic welding for pipe, marking press for marking-off line of the pipe used therefor, and gage for locating abutting part by welding of pipe joint and inspecting welding part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspecting method for a correct welding part easy in operating and free from an error, in automatic welding for a pipe. SOLUTION: One of a reference point of a reference points 22, 23 parting by a distance 2L from each other which is imprinted on a gage body 21 of a gage 20 for locating an abutting part by welding of a pipe joint and inspecting a welding part, is made to coincede with one of a reference marking-off line S1 of a reference marking-off line S1 or S2 at the predetermined position L from an abutting part previously imprinted respectively on each pipe P-1 , P-2 before welding of a weld-connected pipe [(P-1 +P-2 )], and a rim end 21b along the longitudinal direction of a gage body 21 being a scalelike flat plate of the gage for locating the abutting part by the welding of the pipe joint and inspecting the welding part is disposed on the outer wall of the connected pipe [(P-1 )+(P-2 )] by making abut along an axis, and the inspection is carried out by collating the reference marking-off line S2 of the other reference marking-off line of the pipe, the position of the welding part 30 and the bead width W thereof with an appropriate other reference point 22 imprinted on the gage body 21, an intermediate point 24 being the position of the welding part, and the bead width W0 , W1 .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the automatic welding of pipe joint welding butt portions, in which the pipe joint butt welding position is properly arranged at the electrode position of the automatic welding machine, and whether the pipe is misaligned or not. And the method of inspecting whether or not the welding condition of the pipe joint welding butt portion after welding is proper, and the positioning of the marking line marking tool of the pipe used for that purpose and the position of the pipe joint welding butt portion. It also relates to a weld inspection gauge.

[0002]

2. Description of the Related Art In welding pipes, a method of automatically welding two pipes by abutting their joint welding abutting portions is used. An outline of an example of the method will be described with reference to FIG. 7. In FIG. 7, an automatic pipe welder 50 has a welded head of a pipe to be welded at a joint welding butt portion.
The pipe fixture 51 (FIG. 7 (A)) which is fixed so as to be aligned with the electrode position 63 arranged on the No. 1 and the welding head 61 (see FIG. 7A) in which the welding electrode 63 such as tungsten is rotatably arranged. 7 (B)). This is used to weld a pipe in the following manner.

That is, two pipes P having the same diameter to be welded
-1 and P-2, one of the pipes P-1 is first attached to the pipe fixture 51.
The pipe receiving portion 53a of one of the pedestal portions 53, 54 arranged in parallel with the welding head mounting groove 52, which is included in the above, in one end of the joint welding butt portion P-1a.
Are placed so that they are located in the welding head mounting groove 52, and the fixed arm 55 presses them from above and latches 55a.
Tighten and fix with. Next, the other pipe P-2 is connected to the pipe receiving portion 54a of the other pedestal portion 54, and the joint welding butting portion P-2a at one end thereof is joined to the pipe welding portion P- at one end of the fixed pipe P-1. 1a is placed in abutment, and fixed arm 56 presses it from above, and lever cam 56b
Is operated and the latch 56a tightens and fixes.

Subsequently, the welding head 61 is inserted into the welding head mounting groove 52, and the pipe holding portion 62 is inserted into the welding head mounting groove 52, and
The two pipe joint welding butted portions fixed to 1 are held and fixed by the pipe holding portion 62. In this manner, the electrode 63 arranged on the welding head 61 is rotated along the outer peripheral wall of the pipe over the abutting portion of the joint welding abutting portions P-1a and P-2a of two pipes having the same diameter. It is driven and welded.

However, in the above-described automatic pipe welding machine, the abutting portions [P-1a]-[P-2a] of the joint welding abutting portions of the respective pipes have the welding electrodes 63 arranged on the welding head 61. It is an essential requirement to perform a reliable welding without the occurrence of welding defects by being properly placed in the lower position of the. Due to this, conventionally, when two pipes P-1 and P-2 to be welded to the pipe fixture 51 are abutted and fixed, when the first one pipe P-1 is fixed to the pedestal portion 53, The gap gauge 65 having an inverted L-shape shown in FIG. 8 is used so that the position of the one-end joint welding butting portion P-1 can be arranged at the position of the welding electrode 63.

That is, one end of the top plate 66 has a plate thickness of a distance dimension t from the outer wall surface 62a of the pipe clamping portion of the welding head 61 to the position where the tip of the electrode 63 is arranged, and a side wall 67 that hangs down. , The inner wall 5 of one pedestal portion 54 of the pipe fixture 51
4b and the pipe end joint welding butting portion P-1a of the pipe P-1 from the upper portion of the welding head mounting groove 52, and the lower surface 66a of the top plate 66 of the gap gauge 65 is fixed to the pipe fixing tool 51. It is closely attached to the upper surface of the base portion 54 of the
5, the inner surface 67a of the side wall 67 is attached to the pedestal portion 54 of the pipe fixture 51.
The inner wall 54b is held tightly. And the pipe end joint welding butting portion P-1 of the one pipe P-1 to be fixed
The pipe P-1 is moved to the left and right so that a comes into close contact with the outer surface 67b of the side wall 67 of the gap gauge 65, and when the adjustment is completed, the fixed arm 55 presses and tightens the pipe P-1. And fix it.

Next, after the clearance gauge 65 is removed from the welding head mounting groove 52 of the pipe fixture 51, the other pipe P-2 to be welded is welded at its end joint welding butt portion P-2a.
Is coaxially abutted on the pipe end joint welding butt portion P-1a of the pipe P-1, and is arranged by the fixed arm 56.
Is pressed and tightened, and the pipe P-1 is held in a butted state and fixed. Then, subsequently, as described above, the welding head 61 is attached to the pipe fixture 51, and the electrode 63 is rotatably driven.
The pipes of the book are connected by welding.

[0008]

As described above, in the automatic welding of the pipes, when the two pipes P-1 and P-2 having the same diameter having the same diameter are aligned and fixed with the electrode positions of the abutting portions, As described above, the inverted L-shaped gap gauge 65 is used, and its side wall 67 is positioned between the pedestal inner wall 54b of the pipe fixture 51 and the joint welding butting portion P-1a of the pipe P-1 at the time of positioning. After being positioned tightly, the gap gauge 65 can be removed from the welding head mounting groove 52 of the pipe fixture 51 after positioning, with the upper surface of the pedestal 54 of the pipe fixture 51 serving as a fulcrum. Is applied to the other end 66b of the top plate 66 on which the side wall 67 of
The side wall 67 is moved upward and is pulled out.

As a result, the side wall 67 is pulled out from the pipe P-1.
Cannot move in parallel with the joint welding butt portion of the pipe, and it moves obliquely, and the side wall 67 to be extracted hits the joint welding butt portion P-1a of the fixed pipe P-1 and the fixed pipe P-1. Would cause the joint welding to be caught from the predetermined position and prevent reliable welding by catching the joint welding abutting portion, resulting in a welding defect.

In addition, it is the actual situation that the occurrence of welding defects due to this is first recognized by visually confirming the welding state after the completion of welding. Moreover, the confirmation inspection required a lot of experience, and the inspection work was complicated. In addition, the occurrence of such welding defects has been a problem in recent years for welding work for connecting a supply pipe of a gas that explosively ignites upon contact with a toxic gas such as arsine used in semiconductor manufacturing or air such as silane. Was particularly desired to be improved. It has been desired to establish an inspection method that can easily inspect these welding defects after welding and can accurately inspect them.

The present invention has been made in view of the above circumstances.
For automatic welding of pipes, accurately position and fix the joint butting position of the pipe to be welded to the pipe fixture of the automatic welding machine,
The fixed pipe can be removed without moving it. Positioning and welding the joint welding butting position, and easily confirming that the welding state of the joint welding butting part of the pipe after welding is accurate. It is an object of the present invention to provide a possible inspection method, a reference marking line marking tool therefor, and a weld positioning and weld inspection gauge in automatic welding of pipes.

[0012]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a method for inspecting a welded connecting pipe welded by an automatic welding machine, which comprises welding 2
Before welding, a reference marking line is preliminarily marked on the outer peripheral portion of each pipe at a predetermined distance L from each edge joint welding butt portion, and these two pipes are automatically welded by the welding machine. Position the joint welding butt portion of these pipes on the pipe fixture at a predetermined position so as to align with the welding head of the above, and after butt welding with an automatic welding machine, a reference spaced by a distance of 2L along the left and right of the scale-shaped flat plate. A gauge body having an intermediate point and an appropriate bead engraved at a point and its intermediate position L is disposed by abutting them so that the reference marking line engraved on the pipe and one reference point engraved on the gauge body match each other. The other reference marking line of the welded connecting pipe, the position of the welded portion, and the bead width of the welded portion were arranged at a position of a distance of 2L from the reference point that was previously engraved on the edge of the longitudinal portion of the gauge body. The other This is a method for inspecting the welded portion of the welded portion of the welded connecting pipe by comparing it with the reference point, the intermediate point located at the intermediate position of these reference points, and the appropriate bead width. .

According to a second aspect of the present invention, the joint of two pipes to the pipe fixture is positioned at a predetermined position so as to be aligned with the welding head of the automatic welding machine, and when the one pipe is fixed, the joint is fixed. The position of the pipe matches the electrode position of the welding head when the welding head is attached to the pipe fixture, between the joint part of the one pipe and the pipe receiving part for fixing the other pipe of the pipe fixture, A positioning rib having a predetermined width provided on the gauge body is inserted, and two pipe joints are butted against a pipe fixture and fixed so as to match the electrode position of the welding head, and then the butted parts are joined together. 2. The welded portion inspection method according to claim 1, wherein the welded portion inspection is performed by checking whether or not there is a step on the pipe wall of the portion.

According to a third aspect of the present invention, which is used in the method for inspecting a welded portion of the automatic pipe welding according to the first aspect, a reference is provided along a pipe outer peripheral surface at a predetermined dimension from a joint weld abutting portion of the pipe to be welded and connected. A marking line marking tool for marking a marking line on a central upper portion of the other surface of a collar portion having a handle on one side, extending at a right angle to the collar surface, and at a predetermined dimension position from the other surface of the collar. A marking line marking tool for a pipe, in which a marking arm having a marking needle that can be adjusted up and down is provided, and a tube wall holding plate is arranged at a lower portion of the marking arm with a gap for holding the tube wall interposed therebetween. It is what According to a fourth aspect of the present invention, in the method for inspecting a welded portion for automatic welding of a pipe according to the first aspect, a reference marking line is stamped along a pipe outer peripheral surface at a predetermined size position from a joint weld abutting portion of a pipe to be welded and connected. A device for marking a line on a pipe, wherein a partition wall is interposed in the middle and through holes having different diameters are bored on both sides of the partition wall, and the outer wall at both ends along the diameter of the partition wall penetrates the wall. The partition wall is provided with a through hole that communicates with the outside so that both sides of the partition wall are visible from the outside, and a desired distance from the partition wall is provided on the outer wall of each through hole having different diameters on both sides of the partition wall. In this position, a marking line marking tool for a pipe is provided, in which a marking needle mounting hole formed in the diameter direction of the through hole is provided.

According to a fifth aspect of the present invention, there is provided a pipe joint welding butt joint positioning and weld portion inspection gauge used in the weld portion inspection method for automatic pipe welding according to the first aspect, which is a gauge body of a scale-like flat plate. Along the edge in the longitudinal direction, on the left and right ends, between the reference marking line engraved on the pipe to be welded and the pipe end joint welding butt, a reference point that matches the reference marking line engraved on the pipe to be welded. A predetermined distance dimension L of a distance from the reference point, an intermediate position L of these reference points is marked with a graduation capable of recognizing an appropriate bead width, and the appropriate bead width position At the appropriate positions on the left and right, bead width scales for recognizing and confirming the bead width with a slight increase or decrease based on the appropriate bead width are engraved, and the edges along the longitudinal direction of the gauge body are engraved with these scales. Edge end along the vertical direction extending angularly, the other end side forms a stepped edge by cutting the sequential stepwise from one end to the other end is forms a taper,
Further, the lower surface of the wide edge on the side opposite to the tapered portion of the gauge main body extends in the direction perpendicular to the longitudinal direction and the edge of the gauge main body, and the side wall thereof is arranged flush with the wide edge. And a positioning rib having a width of a predetermined dimension for positioning the joint welding butt portion of the pipe to be welded by aligning it with the welding electrode position, and the positioning rib is detachably fitted in a fixed position of the pipe fixture. In order to attach and fix the ribs, the ribs are arranged in parallel with the positioning ribs with a predetermined gap,
A gauge for positioning a welded portion of a pipe joint and also for inspecting a welded portion, in which a fitting mounting groove is provided between the positioning ribs.

According to a sixth aspect of the invention, the longitudinal edge of the gauge main body engraved with the reference point of the pipe joint welding butt joint positioning / weld joint inspection gauge, bead width scale, etc. is along the left and right sides of the lower surface. The pipe joint weld butt joint positioning / weld joint inspection gauge according to claim 5, wherein an inclined surface descending inward from the edge is formed. According to a seventh aspect of the invention, the gauge for positioning the pipe joint welding butt portion and also for inspecting the welded portion according to claim 5, wherein the width of the tapered portion of the gauge body is the same as the predetermined width of the positioning rib. is there.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION As a preferred embodiment of the present invention, a jig for carrying out a welding portion inspection method in automatic welding of pipes according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating an example of a marking line marking tool 10 which constitutes a part of a jig used in a method for inspecting a welded portion of automatic welding of a pipe of the present invention. In FIG. 1, the marking line marking tool 10 is provided with a handle 2 extending substantially at right angles to one surface 1a of a collar portion 1 made of a metal flat plate. or,
On the other surface 1b of the collar portion 1, there is provided a marking needle 3 which is located at the upper part of the central portion thereof and extends at a right angle to the collar surface 1b, and which can be adjusted up and down to a predetermined dimension position L from the collar surface. The provided marking arm 4 is provided. Further, a tube wall holding plate 5 is provided below the marking arm 4 with a gap Y between the lower surface 4a of the marking arm 4 and the tube wall of the tube to be engraved.

The marking line marking tool 10 thus constructed adjusts the protruding position of the tip 3a of the marking needle 3, and then the tube for marking the marking line on the outer peripheral wall has its tube end connected to the marking arm 4. Gap Y formed between the tube wall holding plate 5
Is inserted with the outer peripheral surface of the pipe facing the marking needle tip 3a, and the pipe end surface is abutted against the other surface 1b of the collar portion 1 and held, whereby the marking line marking tool 10 of the present invention is marked with a marking line. Place on the tube 6 to be stamped. Then, by holding the handle 2 and moving it along the outer peripheral surface of the pipe, the tip portion 3 of the marking needle 3 is moved.
a makes it easy to operate the marking line at a predetermined position along the outer peripheral surface of the pipe 6 and can accurately mark the marking line.

FIG. 2 shows a marking line marking tool 11 of another embodiment.
It is sectional drawing explaining an example. The marking line marking tool 11 of this aspect is formed by coaxially punching through holes 13 and 14 having different diameters M and N from both ends of a rod-shaped body 12 toward the center. And these two through holes 1
The intermediate portions of the assembly 3 and 14 are partitioned by a partition wall 15, and the outer walls of both ends along the diameter of the partition wall 15 are provided with through holes 1 along the partition wall 15 from the outside.
Through holes 16 and 17 are formed so that the insides of 3 and 14 can be seen through. Further, on the outer wall of each of the through holes 13 and 14 having different diameters arranged on both sides of the partition wall 15 at a desired distance from the partition wall, a marking needle 3 drilled in the diameter direction of the through hole. Scratch needle attachment holes 18 and 19 for attaching
Is provided. And these marking needle mounting holes 1
Reference numerals 8 and 19 make it possible to attach and detach the scriber needle 3 and adjust the protrusion of the scriber tip 3a. Furthermore, if a plurality of these marking needle mounting holes 18 and 19 are provided at positions of desired distances, respectively, it is possible to select a desired position as necessary and to mark a marking line. It is convenient.

In the marking line marking tool 11 of this embodiment,
It is possible to appropriately select two types of pipes P and Q having different diameters and apply the marking lines to these pipes. In marking the marking line, a pipe P having a diameter matching the diameters of the through holes 13 and 14 is inserted into the through hole 13, for example, and the tip Pa thereof is inserted until it abuts against the surface of the partition wall 15. After confirming this abutting state by seeing through the see-through through-hole 16 or 17, the tip 3a of the scribing needle 3 is adjusted so as to contact the outer wall of the pipe P.

Next, while pressing the pipe P and the main body 12 of the marking line marking tool 11 against each other, at least one of the pipe P and the pipe P and the main body 12 of the marking line marking tool 11 is rotated. At this time, it is possible to see through the through hole 16 or 17 that the tip end Pa of the tube is in contact with the surface of the partition wall 15 of the marking line marking tool 11.
It is better to rotate it while monitoring more. This marking line marking tool 11 is easy to operate, and an accurate marking line can be marked very reliably. Further, since the dust generated at the time of marking is appropriately discharged from the see-through through holes 16 and 17, it is possible to prevent the dust from damaging the tube wall.

Next, an example of a gauge 20 for locating a welded portion of a pipe joint and for inspecting a welded portion for carrying out the welded portion inspection method of the welded portion by the automatic welding of the pipe of the present invention,
This will be described with reference to FIG. FIG. 3 is a perspective view showing a state in which the pipe fitting 51 is used for fixing the welded pipe P-1 to a predetermined position in order to explain an example of the pipe joint welding butt portion positioning / welding portion inspection gauge 20. is there.

In FIG. 3, along the longitudinal edge 21b of the surface 21a of the gauge main body 21 of the scale-like flat plate,
A predetermined distance dimension between the reference marking line engraved on the pipe to be welded and the pipe end joint welding abutment portion as reference points 22 and 23 to be matched with the reference marking line engraved on the pipe to be welded on the left and right ends thereof. Marks are provided at a distance twice as large as L, and an appropriate bead width W0 is marked and displayed at an intermediate point 24 between the reference points 22 and 23 with a recognizable and recognizable scale. Further, to the left and right of the appropriate bead width W0 position marked on the intermediate point 24 of the intermediate position, the appropriate bead width W is provided at a position with an appropriate interval.
Allowable bead widths W1 and W with slight increase / decrease based on 0
The bead width and its scale for recognition confirmation of 2, W3, W4, W5, W6, W7, etc. are engraved.

Gauge body 21 on which the above-mentioned scale is marked
When the lower end of the longitudinal edge 21b is formed to have a descending inclined surface K inward from the edge, for example, an inclined surface of 45 degrees, when the welded portion of the welded connecting pipe is inspected by the gauge main body 21, When the inclined surface K is arranged in contact with the pipe wall, the gauge body 21 can be arranged closely to the pipe wall, and the engraved scale can be easily read, and the scale and bead width can be surely read. Therefore, accurate inspection evaluation can be performed. In particular, it is effective in inspecting the welded portion on the inner wall of the pipe where the measurement and inspection area is narrow.

Further, the gauge main body 21 with these scale markings
The two edge points 21b along the longitudinal direction and the edge edges 21c along the longitudinal direction on the opposite side are also appropriately connected to the two reference points 2 as described above.
2, 23 and midpoint 24 can be engraved and the appropriate bead width W
You may engrave 0 or allowable bead widths W1 and W2.

Further, the edge 2 in the longitudinal direction of the gauge main body 21.
Of the side surfaces 21d and 21e extending at right angles to 1b and 21c, one side surface 21e is from the one end side 21b to the other end side 2
Stepwise edge 21e that is cut out in a stepwise manner toward 1c
-1, 21e-2, 21e-3 are formed and the side surface 21
One end 21b of e forms a tapered portion 25. In addition, on the other side surface 21d of the gauge body 21, on the lower surface 21f,
Positioning rib 2 is flush with the side surface 21d.
6 are provided.

The positioning ribs 26, when fixing the two pipes to be welded to the pedestals 53 and 54 of the pipe fixture 51 of the automatic welding machine 50 as described with reference to FIG. , For aligning and positioning the welding electrode position 63 of the welding head 61.
Electrode 63 of the welding head 61 from the outer wall surface 62a
It has a width of a distance dimension t to the position of the tip of the.

Ribs 27 are provided in parallel with the positioning ribs 26 with a gap z, and between the ribs 27 and the positioning ribs 26, the pipe fixture 51 is attached to the pedestal portion 54. A detachable fitting groove 28 is formed. As a result, the pipe to be welded is fixed to the pedestal portion 53 of the pipe fixture 51 by accurately positioning the pipe joint welding abutting portion at a predetermined position, reliably, and preventing an error.

Next, a method for inspecting a welded portion after welding, in which the pipe of the present invention is automatically welded by an automatic welding machine, using the marking line marking tool and the joint welding butt portion positioning / weld portion inspection gauge described above Will be described. (1) Engraving of a standard marking line on the pipe to be welded As shown in FIG. 4, the marking lines shown in FIG. 1 or 2 are formed on the outer walls of the pipes P-1 and P-2 before welding. With the line marking tool 10 or 11, the reference marking lines S1 and S2 are marked at positions of a predetermined distance L from the respective pipe end joint welding butts P-1a and P-1.

(2) Welding of the pipe to be welded by the automatic pipe welder (i) Positioning of the pipe end joint welding abutting portion of the pipe to be welded on the pipe fixture of the automatic welder, as shown in FIG. Pipe fixing tool 51 of welding machine 50
When the two pipes P-1 and P-2 to be welded to each other are butted and fixed to each other, when fixing the first one pipe P-1 to the pedestal portion 53, the position of the one-end joint welding butted portion P-1a is fixed. , The welding head 6 shown in FIG.
As shown in FIG.
The pipe joint weld butt joint positioning / weld joint inspection gauge 20 shown in FIG.

The positioning ribs 26 of the pipe joint welding butt joint positioning / welding portion inspection gauge 20 are arranged in the welding head mounting groove 52 of the pipe fixing tool 51 so as to be located between the positioning ribs 26 and the ribs 27. The fitting and mounting groove 28 provided in the above is mounted on the other pedestal portion 54 of the pipe fixing tool 51 by straddling it. As a result, the positioning rib 26 is positioned in the welding head mounting groove 52 of the pipe fixture 51 and is fixed to the base 54 very accurately and tightly.

Next, the pipe receiving portion 53a of the one pedestal 53
The one pipe P-1 to be fixed placed on the pipe has a pipe end joint welding abutting portion P-1a which is positioned by the positioning rib 2
The pipe P-1 is moved to the left and right to be adjusted so as to come into close contact with the side wall 26a of 6, and when the adjustment is completed, the pipe P-1 is fixed by pressing and tightening by the fixing arm 55. As a result, the one pipe P-1 of the pipe to be welded is positioned at a position where the pipe end joint welding butting portion P-1a is aligned with a predetermined welding electrode position.

Subsequently, the positioning rib 27 is removed from the welding head mounting groove 52 of the pipe fixture 51. In this detachment, in the pipe joint welding butted portion positioning and weld portion inspection gauge 20 of the present invention, the fitting fitting groove 28 provided between the positioning rib 26 and the rib 27 as described above is provided on the other side of the pipe fixture 51. Since it is mounted on the pedestal portion 54 by straddling the pedestal portion 54, it must be removed by operating it so as to apply a force upward and pull it out. Even if force is applied from the open end, it will not shift sideways. Therefore, no force is applied to the fixed pipe P-1 at the time of this removal, so that the once fixed positioning position is reliably held.

Then, the other pipe P-2 to be welded is made to have its end joint welding butting portion P-2a abutted coaxially with the pipe end joint welding butting portion P-1a of the pipe P-1. Then, the fixed arm 56 presses and tightens the pipe P-2 to secure the pipe P-2.
Hold the butt against -1 and fix. After that, FIG.
As shown in the figure, the pipe joint weld butt joint positioning / weld joint inspection gauge 20 has a tapered portion 25 (21e-1),
Inserted into the welding head mounting groove 52 of the pipe fixture 51, abutted on the abutting portion of the pipes P-1 and P-2 to be welded, and slid on the outer peripheral wall around the pipes to inspect for presence or absence of a step. Check for misalignment. If there is a misalignment, the fixing state of the other pipe P-2 is adjusted to eliminate the misalignment.

(Ii) Automatic welding Then, after these operations are completed, the welding head 61 is continuously mounted in the welding head mounting groove 52 of the pipe fixture 51, and the electrode 63 is rotated to drive the two pipes. P-1 and P-2 are welded joints of their joints (P-1a)-(P-2a)
Are automatically welded and connected by welding.

(3) Inspection of Welded Part After Welding The inspection of the welded joint of the pipes P-1 and P-2 thus automatically welded is carried out as follows. After automatic welding is finished, the pipes connected by butt welding are
As shown in FIG. 6, the welded connecting pipe [(P-
1) + (P-2)] along the axial direction of the pipe wall, the gauge flat plate-shaped gauge main body 21 is brought into contact with the welded connecting pipe [(P-1)
+ (P-2)] weld portion 30 is properly positioned at these abutting portions, bead of weld portion 30 is sure to weld and connect both pipes. Check whether the bead width is large or not.

That is, a pipe [(P-1) + which is welded and connected.
(P-2)], one of the reference marking lines S1 or S2 that is pre-marked on the pipes P-1 and P-2 before welding in the manner described in (1) above. A line, for example, the reference marking line S1 in FIG. 6 is aligned with the reference point 23 engraved on the gauge body 21 of the pipe joint welding butt joint positioning / welding portion inspection gauge 20 of the present invention to position the pipe joint weld butt joint position. The edge 21b along the longitudinal direction of the gauge main body 21 of the scale-like flat plate of the welded portion inspection gauge 20 is attached to the outer wall of the welded connecting pipe [(P-1) + (P-2)] along the axis. Place them in contact with each other.

Then, the connected welded connecting pipe [(P-1) +
(P-2)] and the reference marking line S2 engraved on the joint welded portion 30 of the other pipe P-2 and the reference point 23 on the gauge main body 21 arranged by abutting against the outer wall of the pipe. 2L
Of the welded portion 30 and the intermediate point 24 which is pre-marked at the intermediate position L between the bead of the welded portion 30 and the reference point 22. An appropriate bead width W0 or allowable bead widths W1, W2, W3 in which the bead of the welded portion 30 is engraved on the gauge body 21.
…… Check against W7 etc.

Then, the welded joint pipe [(P-1) +
(P-2)] The reference marking line S2 pre-marked on the pipe P-2 is
Whether or not it matches one of the reference points 22. ● Whether or not the position of the butt-welding portion 30 of the connected welded connection pipe [(P-1) + (P-2)] matches the position of the intermediate point 24. ● The bead width of the butt-welding portion 30 of the welded joint pipe [(P-1) + (P-2)] connected is an appropriate bead width W0, or an acceptable bead width W1, W2, W3, ......, W7
Or not. Etc. are inspected and the pass / fail of welding is evaluated.

[0040]

EFFECTS OF THE INVENTION The welding portion inspection method for automatic welding of the pipe of the present invention, and the marking line marking tool for pipes and the pipe joint welding butt portion positioning / welding portion inspection gauge used for this are carried out in the above-mentioned modes, The following effects are achieved. That is,
In the method for inspecting the welded portion by the automatic welding of the pipe of the present invention, since the reference marking line as the reference for the inspection is imprinted at the predetermined position, it is easy to determine whether the predetermined welded portion matches the appropriate position. It is possible to inspect, and moreover, by using the marking tool for the reference marking line, the accurate reference marking line can be marked, so that the position of the welded portion can be accurately checked.

Further, in the method for inspecting the welded portion by the automatic welding of the pipe of the present invention, the positioning rib provided in the gauge for locating the welded joint at the joint for welding the pipe for automatic welding of the pipe and for inspecting the welded portion is provided. By using and positioning and fixing the welding butt portion of the pipe to the pipe fixture of the automatic welding machine, the butt welding position can be accurately positioned without causing an error in alignment with the electrode position of the welding head. . Therefore, upon welding, good welding can be performed without occurrence of welding loss in the welded portion, and as a result, the proper position of the welded portion and the bead width can be easily recognized without error. Efficient inspection can be performed.

Further, in the method for inspecting the welded portion by the automatic welding of the pipe of the present invention, the scale-like flat plate provided in the gauge for locating the welded portion of the joint for welding the pipe for automatic welding of the pipe and inspecting the welded portion Using the gauge body, check the appropriate welded part position, bead width, etc. stamped on this,
Since the pipe butt welded part of the welded connecting pipe is inspected, the position of the welded part can be accurately evaluated and the bead width of the welded part can be evaluated accurately, and can be performed in a single operation. The workability is improved. Moreover, since the edge scale marking portion of the gauge main body of the scale-like flat plate is inclined downward, it is easy to read and can be read without making a mistake.

Further, in the method for inspecting the welded portion by the automatic welding of the pipe of the present invention, the pipe for welding the joint for welding the welded butted portion for inspecting the welded portion used for the automatic welding of the pipe is used as the gauge of the pipe. The positioning ribs for positioning the welded butt joints and the scale-shaped flat plate of the gauge body of the weld inspection gauge are organically integrated to form a welding work for automatic welding of pipes and quality control of welded products. In particular, it exerts a remarkably great effect in order to prevent the occurrence of welding defects in the welded portion in the pipe construction work of the gas supply pipe for semiconductor manufacturing.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an example of a marking line marking tool used in a welded portion inspection method by automatic welding of a pipe according to the present invention.

FIG. 2 is a cross-sectional view illustrating another example of the marking line marking tool used in the method for inspecting a welded portion by the automatic welding of the pipe of the present invention.

FIG. 3 is a perspective view illustrating an example of a pipe joint welding abutting portion positioning / welding portion inspection gauge used in the welding portion inspection method by automatic pipe welding of the present invention.

FIG. 4 is an explanatory view of a reference marking line marking step of the welded portion inspection method by automatic welding of the pipe of the present invention.

FIG. 5 is an explanatory view of an example of positioning a pipe joint welding butt portion in a weld portion inspection method by automatic pipe welding according to the present invention.

FIG. 6 is an explanatory diagram of a method for inspecting a welded portion of a welded connecting pipe with a gauge main body 21 of a scale-shaped flat plate in a welded portion inspection method by automatic welding of pipes of the present invention.

FIG. 7 is a perspective view illustrating an automatic pipe welding machine.

FIG. 8 is a perspective view illustrating a conventional pipe joint welding butt joint positioning gap gauge.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Marking line marking tool of an example of this invention, 11 ... Marking line marking tool of another example of this invention, 1 ... Collar part, 2 ... Handle, 3 ...
Scribing needle, 4 ... Scribing arm, 5 ... Tube wall holding plate, 6 ...
Pipe 12 ... Rod-shaped main body, 13, 14 ... Through hole, 15 ... Partition wall, 16, 17 ... Through hole, 18, 19 ... Marking needle mounting hole, 20 ... Pipe joint welding butt portion positioning / welding portion inspection gauge, 21 ... Scale-shaped flat plate gauge body, 2
1a ... Surface of gauge body of scale-like flat plate, 21b ... Edge of longitudinal direction of gauge body of scale-like flat plate, 21c ...
Opposite edges of the longitudinal edge 21a of the gauge body of the scale-like flat plate, 21d ... Sides 21e-1, 21e-2, 21e-3 of the gauge body of the scale-like flat plate, ... Steps of the gauge body of the scale-like flat plate -Shaped side surface, 21f ... Back surface of scale-shaped flat plate gauge body, 22, 23 ... Reference point, 24 ... Intermediate point,
Reference numeral 25 ... Tapered portion, 26 ... Positioning rib, 27 ... Rib, 26a ... Positioning rib side wall, 28 ... Fitting mounting groove, 30 ... Welding portion, 50 ... Pipe automatic welding machine, 51 ...
Pipe fixture, 52 ... Welding head mounting groove, 53, 54 ... Pedestal part, 53a, 54a ... Pipe receiving part, 55, 56 ... Fixed arm, 55a, 56a ... Latch 56b ... Lever cam, 61 ... Welding head, 62 ... Pipe Clamping part, 62a ... One surface of the tube clamping part, 63 ... Electrode, 65
... Gap gauge, 66 ... Top plate, 67 ... Side wall, P-1, P
-2 ... Pipe, P-1a, P-2a ... Pipe joint welding abutting part, t ... Distance from the outer wall surface of the pipe nipping part of the welding head to the tip position of the electrode, S1, S2 ... Standard marking on the pipe Line, L ... Distance from pipe end abutting part to reference marking line, k ... Inclined surface, W ... Weld bead width, W0 ...
Suitable bead width, W1, W2, W3, W4, W5, W6, W7
... Allowable bead width

Claims (7)

[Claims] 1. A method for inspecting a welded joint pipe welded by an automatic welding machine, wherein two pipes to be welded and jointed are provided on an outer peripheral portion at a predetermined distance L from each edge joint weld abutting portion. Before welding, mark the reference marking line with the marking line marking tool and position the joints of these pipes in the pipe fixing tool at the specified positions to align these two pipes with the welding head of the automatic welding machine. Then, after butt welding with an automatic welding machine, the gauge main body with the intermediate point and the proper bead width stamped on the reference point and the intermediate position L at a distance of 2L along the left and right of the scale-shaped flat plate is stamped on the pipe. The reference marking line and the reference point marked on the gauge body are placed in abutment so that they match each other, and the other reference marking line of the welded connecting pipe, the position of the weld, and the bead width of the weld are Said The other reference point arranged at a distance of 2L from the reference point previously engraved on the longitudinal edge of the main body, the intermediate point arranged at the intermediate position of these reference points, and the appropriate bead width are compared. A method for inspecting a welded portion of a welded joint pipe by inspecting the welded state of the welded pipe. 2. When positioning a joint welding abutting portion of two pipes to a pipe fixture at a predetermined position so as to align with a welding head of an automatic welding machine, the joint portion position is fixed when one pipe is fixed. The gauge body is provided between the joint portion of the one pipe and the pipe receiving portion for fixing the other pipe of the pipe fixing device so that when the welding head is mounted on the fixture, the electrode position of the welding head is matched. A positioning rib having a predetermined width is inserted, and two pipe joints are butted against a pipe fixture and fixed so as to match the electrode position of the welding head, and then a step of the pipe wall at the butted portion is obtained. The method for inspecting a welded portion for automatic welding of pipes according to claim 1, wherein the presence or absence of the welded portion is confirmed and the positioning is performed. 3. A pipe for use in the method for inspecting a welded portion for automatic welding of a pipe according to claim 1, wherein a reference marking line is engraved along a pipe outer peripheral surface at a predetermined dimension position from a joint weld abutting portion of the pipe to be welded and connected. The marking line marking tool of, which extends at a right angle to the flange surface at the center upper portion of the other surface of the flange portion having a handle on one surface, and which can be vertically adjusted to a predetermined dimension position from the other surface of the flange portion. A marking line marking tool for a pipe, characterized in that a marking arm having a marking needle is provided, and a tube wall holding plate is arranged at a lower portion of the marking arm with a gap for holding a tube wall interposed therebetween. . 4. A pipe for use in the method for inspecting a welded portion for automatic welding of a pipe according to claim 1, wherein a reference marking line is engraved along a pipe outer peripheral surface at a predetermined size position from a joint weld abutting portion of the pipe to be welded and connected. The marking line marking tool of, wherein a partition wall is interposed in the middle, through holes having different diameters are bored on both sides of the marking wall, and the outer wall at both ends along the diameter of the partition wall penetrates the wall. Through-holes communicating with the outside are provided so that both sides of the partition are visible from the outside, and the outer walls of the through holes having different diameters arranged on both sides of the partition with a desired distance from the partition are provided. A marking line marking tool for a pipe, characterized in that a marking needle mounting hole is formed at a position in the diameter direction of the through hole. 5. A gauge for positioning a pipe joint welding butt portion and inspecting a weld portion, which is used in the weld portion inspection method for automatic pipe welding according to claim 1, at a longitudinal edge of a gauge main body of a scale-like flat plate. Along the left and right ends of the pipe, reference points for matching the reference marking line engraved on the pipe to be welded are provided with a predetermined distance L between the reference marking line engraved on the pipe to be welded and the pipe end joint welding butting portion. Marked at a distance twice as large as that of the reference point, an intermediate position L of these reference points is marked with a scale capable of recognizing and confirming the intermediate point and an appropriate bead width, and the appropriate bead width position is appropriately positioned on the left and right sides thereof. A bead width scale for recognizing and confirming the bead width with respect to the slight increase or decrease of the slight difference based on the appropriate bead width is engraved, and a vertical direction extending in the direction perpendicular to the edge of the engraved gauge body along the longitudinal direction. The edge edge is stepwise cut from one end to the other to form a stepwise edge edge, and the other end side forms a taper. On the lower surface of the wide edge, a joint welding butt portion of the pipe to be welded, which extends in a direction perpendicular to the longitudinal direction and the edge of the gauge body, and whose side wall is arranged flush with the wide edge, is provided. A positioning rib having a width of a predetermined dimension for positioning by aligning with the welding electrode position, and the positioning rib and the predetermined positioning rib for detachably fitting and fixing the positioning rib at a fixed position of the pipe fixture. A gauge for positioning a welded portion of a pipe joint and also for locating a welded portion, in which ribs are arranged in parallel with each other with a space provided, and a fitting mounting groove is provided between the positioning ribs and the ribs. . 6. A longitudinal end of the gauge main body, which is marked with a reference point of a gauge for locating a welded portion of a pipe joint and also for inspecting a welded portion, a bead width scale, etc., extends inward from the edge along the left and right of the lower surface thereof. The gauge for positioning a welded portion of a pipe joint and also for inspecting a welded portion according to claim 5, characterized in that an inclined surface that descends toward one side is formed. 7. The gauge for locating and locating welded joints of pipe joints according to claim 5, wherein the width of the tapered portion of the gauge body is the same as the predetermined width of the positioning ribs.