JPH0655266A - Automatic welding method for tube stud - Google Patents

Abstract

PURPOSE:To save manpower and to efficiently perform welding. CONSTITUTION:The tube stud 22 is located right beside tube stock 21 and the half part of the periphery of the upper part of the periphery of the tube stud 22 is welded alternately right and left by 1/4 of the periphery right above from right beside by vertical up welding by automatic welding equipment 25. When welding of the half part of the periphery of the upper part of the periphery of the tube stud 22 is completed, the tube stock 21 is rotated by 180 deg. in the circumferential direction by a manipulator 24, the unwelded half part of the periphery of the tube stud 22 is located at the upper part and the half part of the periphery of the upper part is welded alternately right and left by 1/4 of the periphery right above from right beside by vertical up welding by the automatic welding equipment 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically welding a nozzle.

[0002]

2. Description of the Related Art A conventional method for welding a nozzle to a mother pipe will be described with reference to FIGS. 3A, 3B and 3C. Stub 2
2 is positioned and temporarily mounted, and as shown in FIG. , 4, 5 and 6 are welded alternately from right side to right side by 1/4 lap, right and left,
Next, after turning the mother tube 21 upside down, as shown in FIG. 3B, the welding start end portion right next to the start of the vertical upward welding is gouged over the range of θ ₁ and θ ₂ and then, Figure 3
As shown in (c), 1 /
As shown in the arrows C and D, the two laps are welded vertically upright by welding in the order of 7,8,9,10,11,12 from right beside to right above by 1/4 lap alternately. The entire circumference of the nozzle 22 is welded.

[0003]

However, in the above-mentioned welding, the welding wire is automatically fed by a machine, and the welding torch is held by an operator to carry out the work, that is, so-called semi-automatic welding. Since the vertical reversal is performed by a crane or the like, there is a problem that an extra worker is required and the welding work efficiency is low.

The present invention has been made in view of the above-described embodiment, and an object thereof is to eliminate unnecessary workers to save labor and to efficiently perform welding of a nozzle to a mother pipe. .

[0005]

SUMMARY OF THE INVENTION According to the present invention, the upper half of the outer circumference of the nozzle stand is erected in a state where the nozzle is arranged so as to be orthogonal to the mother tube and is positioned almost right beside the mother tube. By the upward welding, the welding is performed from the right side to the right side by 1/4 turns alternately by the left and right by the automatic welding device, and when the welding of the upper half of the outer periphery of the nozzle base is completed, the mother pipe is rotated in the circumferential direction by the rotating device. Rotate 180 degrees to position the unwelded ½ circumference part of the nozzle to the upper part, and the ½ circumference part of the upper part is vertically upright welded for 1/4 lap from right side to right above. Welding is carried out alternately on the left and right by an automatic welding device.

[0006]

The vertical upward welding of the nozzle to the mother tube is automatic welding, and the upside down of the mother tube is performed by rotating the mother tube 180 degrees in the circumferential direction by the manipulator, so extra work is required. This eliminates the need for personnel and saves labor and enables efficient welding.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show a situation in which the method of the present invention is being carried out, in which 23 is provided two at each location for supporting the mother tube 21 so as to be rotatable in the circumferential direction. A plurality of sets of supporting rollers 24, which grip one end of the mother pipe 21, rotate the mother pipe 21 by 180 degrees in the circumferential direction during welding work as necessary, and turn the mother pipe 21 upside down.
Is an automatic welding device which is arranged on both sides of the mother pipe 21 in the radial direction and can be moved in the longitudinal direction of the mother pipe 21 along rails 26 laid parallel to the mother pipe 21.

The manipulator 24 is provided with a horizontal shaft 28 that is rotated by an actuator 27 such as an electric motor, and a gripping part 29 that is attached to the horizontal shaft 28 and that can be opened and closed.

The automatic welding device 25 is a carriage 3 which is slidable on the rail 26 by a driving device (not shown).
0, a turning table 31 mounted on the carriage 30 and capable of turning in a horizontal direction by an actuator (not shown), and turning and turning by an actuator (not shown) standing on the turning table 31. A multi-joint robot type arm 32 capable of performing motions such as ups and downs, and a welding wire 33 attached to the tip of the arm 32 and inserted through the welding portion 3 between the nozzle base 22 and the mother pipe 21.
5, a welding torch 34 to be supplied to the welding torch 5, a reel for supplying the welding wire 33 to the welding torch 34, and other various devices necessary for automatic welding.

At the time of work, the mother tube 21 with the nozzle 22 positioned and temporarily attached is mounted on the support roller 23, and the mother tube 2 is held by the grip portion 29 of the manipulator 24.
1 end is gripped and the horizontal axis 2
8 and the grip portion 29 to rotate the mother tube 21,
The mother tube 21 is stopped in a state where 2 is located right next to the mother tube 21.

Next, the automatic welding device 25 on the side where the nozzle 22 is directed (the device on the front side in the case of FIGS. 1 and 2)
Is moved to stop at a predetermined position on the rail 26, the arm 32 is operated, and a welding wire 33 is formed from the welding torch 34 between the base of the nozzle 22 and the outer surface of the mother pipe 21. 35, and the nozzle 22 and the mother pipe 21 are welded.

An example of this welding sequence is shown in FIGS.
Explaining with (c), first, as shown in FIG. 3 (a), a half of the outer circumference of the upper part of the nozzle base 22 is subjected to vertical upward welding 1 and 2 as shown by arrows a and b. , 3, 4,
Weld 1/4 turns alternately from the side to the top in the order of 5 and 6. At this time, when the welding of the portion of sequence 1 is completed, the automatic welding device 25 is moved along the rail 26 to the right side in FIGS. 1 and 2, and the turning table 31 is turned to turn the arm 32.
The direction of the welding torch 34 and the welding torch 34 are changed to perform the welding of the sequence 2 portion, and then the automatic welding device 25 is moved along the rail 26 as shown in FIG.
2 is moved to the left side of FIG. 2, the swivel table 31 is swung to make the arm 32 and the welding torch 34 have the same orientation as in the case of performing the sequence 1 welding, perform the sequence 3 welding, and sequentially perform the automatic welding device 25. To the right or left to move 4,
Welding is performed in the order of 5 and 6.

After the welding of the upper half of the outer periphery of the nozzle base 22 is completed, the manipulator 24 rotates the mother pipe 21 180 degrees in the circumferential direction to change the direction of the nozzle base 22 as shown in FIG. Change 180 degrees as shown by the dashed line. For this reason, the upper half of the outer circumference of the nozzle 22 is shown in FIG.
The non-welded part is located as shown in.

Therefore, as shown in FIG. 3 (b), the welding start end portion located right beside the radial direction of the nozzle 22 is spread over the range of θ ₁ and θ ₂ by gouging using an automatic gouging device. While removing and moving the automatic welding device 25 on the side to which the nozzle 22 is directed alternately back and forth along the rail 26, the half circumference of the upper outer periphery of the nozzle 22 is shown by arrows C and D. By vertical upward welding,
Weld 1/4 turns alternately from the right side to the right side in the order of 0, 11 and 12.

The embodiments of the present invention are not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0017]

According to the method of automatically welding a nozzle of the present invention,
Welding of the nozzle of the nozzle to the mother tube can be performed automatically without the need for an extra worker, and since the nozzle can be inverted by a rotating device, labor can be saved and welding can be performed efficiently. Various excellent effects such as good performance can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which an automatic welding method for a nozzle of the present invention is carried out.

FIG. 2 is a plan view of FIG.

3 (a), (b) and (c) are front views showing a procedure for welding the nozzle to the mother tube by vertical upward welding.

[Explanation of symbols]

 21 mother pipe 22 nozzle stub 24 manipulator (rotating device) 25 automatic welding device

Claims (1)

[Claims] 1. In a state where a nozzle, which is arranged so as to be orthogonal to the mother pipe, is positioned almost right beside the mother pipe, a half of the upper part of the outer periphery of the nozzle is vertically welded from the right side to the right side. 1/4 to the top
The welding is performed by the automatic welding device alternately on the left and right sides, and when the welding of the upper half of the outer periphery of the nozzle base is completed, the mother pipe is rotated about 180 degrees in the circumferential direction by the rotating device and the nozzle base is not welded. 1 / 2 lap portion is located at the upper part, and the ½ lap portion of the upper part is vertically welded by upright welding, and is welded from right side to right side by 1/4 turn alternately by an automatic welding device. Automatic welding method for nozzles.