JPS58122200A - Welding method of spiral pipe, and its device - Google Patents

Abstract

PURPOSE:To efficiently execute welding of high accuracy, by making a temporarily welded spiral pipe execute a spiral operation, detecting a butt part position of temporary welding by a detector, controlling the position, and executing profile welding. CONSTITUTION:On a turning roll 4 of a running truck 3 which is capable of moving horizontally, a temporarily welded spiral pipe 9 is loaded, and a temporarily welded butt part 25 is positioned so as to be detected by a detector 16. Subsequently, a slide base 14 is moved in the axial direction of the pipe 9 by a screw shaft 18 and an electric servomotor 17, and an electrode wire 11 provided on the slide base 14 is positioned in the butt center of the pipe 9. Subsequently, by expanding a spherical ball 19 of the upper direction, abnormal vibration in the upper and lower, the left and right directions of a supporting body of the electrode wire 11 is prevented, the turning roll 4 and the running truck 3 and driven at a set speed, and the spiral pipe 9 is made to execute a prescribed spiral operation. Regular welding is executed by feeding the electrode wire 11 from a wire pack 21, and controlling the position by the detector 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is for welding the abutting portions of spiral pipes rolled by a temporary welding forming stand while controlling the position with high accuracy at any forming angle. Spiral pile that enables high-precision welding even when
The present invention relates to a welding method and device.

Conventionally, the manufacturing method for spiral pipes is to weld them while forming them using a forming stand, and after temporarily attaching the butt parts during forming, the butt parts of the spiral pipe are permanently welded. In addition, in the conventional method, welding is performed during molding, so there are no blowholes or
There are quality problems as defects such as cracks are likely to occur;
Due to constraints on welding speed, forming speed was also limited, making manufacturing operations inefficient.

The present invention has been made to solve the problems of the above-mentioned conventional methods.The first invention is a turning device that can be conveyed in a spiral manner (for example, a turning device such as a skew roller or a turning roll provided on a truck). A temporarily welded spiral pipe is placed on top of the device), and the position of the temporarily welded butt part of the pipe is detected by a butt position detector, and the pipe is placed on a support that can be moved in the axial direction of the pipe. This spiral pipe welding method is characterized in that the welding electrode wire is always placed at the center position of the pipe abutting part for main welding using a copying device.

In the second invention, a slide base is disposed on a boom connected to a lifting device, and a butt portion detector disposed on the slide base and the tip of a welding electrode wire are disposed at a predetermined interval. (Arranging the tip of the welding electrode wire and the butt part detector at a predetermined distance means arranging them at two points on the spiral locus of the spiral butt weld part with a phase shift.) At the same time, a plurality of spherical balls are arranged around the boom, and the spherical balls are connected to a hydraulic cylinder to enable adjustment of the height position, and a movable cart is moved in and out of the lower part of the slide base. This is a welding device for spiral pipes.

First, the method which is the first invention will be explained using FIG. In the figure, a temporarily welded spiral pipe 9 is mounted on a turning roll or a main rolling roll 4 provided on a horizontally movable traveling carriage 3. The position of the temporarily welded butt part 5 of the pipe 9 is detected by a butt position detector 16.
I am trying to detect it with . A support that is inserted into the pipe 9 and is movable in the axial direction (boom 1 in the example in Figure 1)
0 and the slide base 14) are connected to a welding machine stand that is higher than the lifting jack. Then, the slide base 14 is moved in the axial direction of the pipe 9 by a copying device (screw shaft 18 and electric servo motor 17 in the example shown in FIG. 1), and the welding electrode wire 11 disposed on the slide base 14 is butted against the pipe 9 Make sure to place it in the center of the section. That is, by detecting the butt temporary welding part in advance with the butt position detector 16, it is checked whether the tip of the electrode wire 11 is in the center of the butt part of the pipe 9, and the actual welding can be carried out reliably. It is possible.

In the example shown in FIG. 1, the butt position detectors 16 for the welding electrode wires 11 are provided on the slide base 14 at predetermined intervals. It may be something that is detected. In short, the position of the temporary welded part is detected by the detector, and the electrode wire 1
1 may be located at the center of the pipe abutting portion.

Embodiments of the second inventive device of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a welding device according to the present invention.
°A spiral pipe loaded on a rotating pipe truck, and a welding electrode wire support and a Boo! inside the pipe.・The welding equipment in which the .

A traveling truck 3 driven by a variable speed motor 2 runs on the shuffle 1, and a plurality of sets of turning rolls 4 are mounted on the traveling truck 3. The turning roll 4 is rotationally driven by a variable speed motor 5, and can be moved on a guide rail 8 by a screw shaft 6 and an electric motor 7, so that an arbitrary roll pitch can be set. A temporarily welded spiral pipe 9 is loaded on the turning roll 4, and by combining the appropriate speeds of the variable speed motors 2 and 5, the spiral pipe 9 can be moved in any desired direction according to the spiral forming angle θ. is possible.

The tip of the boom 10 serves as a welding electrode wire support, and one or more welding electrode wires 11 are fed through a nozzle 12 to the butt part of the spiral pipe 9 by a welding electrode wire feeding motor 13. be done. The nozzle 12 and the welding electrode wire feed motor 13 are attached to a slide base 14, and the slide base 14 can slide on a linear guide rail 15 in the axial direction with respect to the spiral pipe 9. An abutting part position detector 16 attached to the tip of the slide base 14 so that the relative position with the tip of the welding electrode wire 11 does not change changes the position of the tip of the welding electrode wire 11 and the butting part of the spiral pipe 9 The amount of deviation is detected with high precision, and the electric servo motor 17 is driven by the signal, and the screw shaft 1 is
The position of the welding electrode wire 11 is controlled so that the tip of the welding electrode wire 11 is always located at the center of the abutting portion of the spiral pipe 9 by sliding the slide base 14 through the welding wire 8.

The boom 10 also has spherical holes 1 at several locations in the axial and circumferential directions with respect to the spiral pipe 9.
9, and can follow any spiral movement of the spiral pipe 9. In addition, by making the downward spherical ball 19 have a bogie structure, it is possible to prevent abnormal vibrations caused by falling into the butt portion of the spiral pipe 9.
9 has a structure whose height can be adjusted by applying air cylinder pressure, so it can support any inner diameter of the spiral pipe 9, and prevents the welding head from generating abnormal vibrations in the vertical and horizontal directions. There is. The boom lO is attached to a welding machine stand 22 with a wire back 21,
The welding machine stand B is supported by a lifting motor and a lifting screw jack 24 so that the height of the boom lO can be adjusted according to the height of the spiral pipe 9.

Next, a case will be described in which the butt portions of the spiral pipes that have been temporarily welded in the above configuration are permanently welded.

The spiral pipe 9 is loaded onto the turning roll 4 using a Kirakui device (not shown) at a position away from the main welding device, and the traveling cart 3 is run in the direction of the main welding device. The boom 10 is supported by a support device (not shown) in the form of a hydraulic cylinder, and when the welding electrode wire support and the boom 10 begin to be inserted into the spiral pipe 9, the support device is moved by the traveling carriage 30. The boom lO is retracted to a position where it does not interfere with the movement of the boom lO, and the boom lO is supported on the inner surface of the spiral pipe 9 via the spherical ball 19. Since the spherical ball 19 has a bogie structure, the spiral pipe 9
The welding head is smoothly inserted into the spiral pipe 9 without falling into the abutting part, and the traveling carriage 3 is stopped when the nozzle 12 reaches the pipe end. Next, Turning Roll 4! The spiral pipe 9 is rotated, and the rotation is stopped at the same time as the abutting portion position detector 16 detects the abutting portion.

Welding is started from this point, and the upward spherical ball 19 is extended to prevent abnormal vertical and horizontal vibrations of the welding electrode wire support, and the turning roll 4 and traveling carriage 3 are Driving is started at the set speed, and the spiral pipe 9 starts a spiral motion that matches the forming angle θ.

The welding electrode wire 11 in the wire pack 21 is fed out by the welding electrode wire feed motor 13, and the abutting portions are welded. During welding, the butt part position detector 16 constantly detects the position of the butt part, and the electric servo motor 17 controls the position with high precision so that the welding electrode wire 11 is always located at the center of the butt part. I'm doing it (.

The spiral pipe 9 welded in this manner is discharged by a kick-out device (not shown) at a position away from the main welding device, and flows to the next process. Note that the spiral full one rotation moving device, electric servo mechanism, etc. illustrated in the description of the invention of the method are not limited to the illustrated system, and it goes without saying that other known systems may be substituted. For example, the swivel pipe rotation and movement device may be of a skew roll type, and the electric servo mechanism may be a copying mechanism such as a hydraulic servo type. In addition, the butt part position detector does not need to fix the relative position with the welding electrode wire (the position of the butt part may be detected from outside the spiral pipe, and the welding electrode wire support Although the device from the electrode wire 11 to the slide base 14 is referred to, if the position of the boom 10 is also controlled by the copying mechanism, the device from the welding electrode wire 11 to the boom i is referred to.
The parts up to o are called the welding electrode wire support.

As explained above, according to the spiral pipe welding method and apparatus of the present invention, when the butt portions of spiral pipes that have been temporarily welded are actually welded, the butt portion position detector and the In combination with a copying mechanism, highly accurate welding is possible, and furthermore, welding can be performed at any forming angle without any adjustment. Therefore, it exhibits excellent effects in terms of quality and work efficiency, which were problematic in the conventional method of simultaneously performing forming and welding.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention. 1a・Rail, 2ea variable speed motor, 3・-travel trolley,
4... Turning roll, 5... Variable speed motor, 6...
Screw shaft, 7...Electric motor, 8...Guide rail, 9
...Spiral pipe, 10..Boom, 11..Welding electrode wire, 12..Nozzle, 13..Welding electrode wire feeding motor, 14..Slight heath, 15..Linear kite rail, 16..Butt Part position detector, 17
・・Electric servo motor, 18・・Screw shaft, 19・
- Spherical ball, addition... Air cylinder 21... Wire back, 22... Welding machine stand, blade... Lifting motor, Sae...
Lifting screw jack 25ha Butt part. Patent applicant Representative patent attorney Tomoyuki Yabuki (and 1 other person)

Claims (2)

[Claims] (1) Place the temporarily welded spiral pipe on a turning device that can be conveyed in a spiral shape, and insert the pipe into the spiral pipe by detecting the position of the temporarily welded butt part of the pipe with a butt position detector. and a welding electromagnetic wire disposed on a support that is movable in the axial direction of the pipe,
A spiral pipe welding method characterized in that main welding is performed by always positioning a copying device at the center of the pipe butt part. (2) A slide base is disposed on a boom connected to the lifting device, and the abutment detector disposed on the slide base and the tip of the welding electrode wire are disposed at a predetermined interval, A plurality of spherical balls are arranged around the boom, and the spherical balls and the hydraulic cylinder are connected to make the height adjustable, and a movable trolley is marked on the lower part of the slide base so that it can be moved in and out. A spiral pipe welding device that resembles a turning device.