JPS5835076A - Automatic circumferential welding device for pipe - Google Patents

Abstract

PURPOSE:To permit sufficient cooling in accordance with the difference in the diameters of pipes by forming the surfaces of water cooling boxes facing the pipe to circular conical conical surfaces, and providing plural adjusting members for pipe diameters having circular surfaces on the outer side between the water cooling boxes and the outside surface of the pipe. CONSTITUTION:Water cooling boxes 11a, 11b are provided between welding heads 1a, 1b and a pipe 14. The boxes 11a, 11b are made into such a shape obtained by bisecting a cylindrical body, and the surfaces 13a, 13b facing the pipe 14 are made into circular conical surfaces. Adjusting members 15a, 15b for pipe diameters are inserted between the inside surfaces of the boxes 11a, 11b and the outside surface of the pipe 14, and the outside surfaces thereof are made into a circular conical surfaces meeting the surfaces 13a, 13b of the boxes 11a, 11b. The members 15a, 15b are driven into the spaces between the above-mentioned surfaces and are brought into tight contact with the pipe 14, whereby the errors in the outside diameter of the pipe 14 are absorbed and the pipe is cooled sufficiently. Steel materials, aluminum materials or copper materials having good heat conductivity are preferably used for the members 15a, 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic circumferential welding device for pipes, and particularly to a cooling device therefor.

A conventional device of this type is the one disclosed in Japanese Patent Publication No. 51-33066. The structure is shown in Figures 1 and 2.
This will be explained using figures. The welding heads 1a, lb are half-cylindrical bodies connected by hinges (not shown) and surround the pipe, allowing the welding heads to be attached to and removed from the pipe.

When fixing the tube, bolts provided on the side opposite the hinge are used to attach and detach the tube (not shown). The slide rings 3a and 3b are half-cylindrical bodies, and a welding torch 4 is attached to them. A wire reel 7 and a wire feeding device 6 are attached to automatically weld the circumference of the tube. During welding, a considerable amount of heat is transferred from the welded part. In order to protect the welding equipment from this heat, a cooling box 9a that also serves as a centering unit supplies cooling water from the nipple loa and discharges it from the nipple loa.

9b is used.

However, in such equipment, the inner diameter of the cooling box must be changed each time depending on the pipe diameter, and there is a manufacturing error (allowed by the standard) in the outer diameter of the pipe, so the inner diameter of the cooling box must be changed accordingly. However, there is a problem in that the contact surface of the welding head is not always in sufficient contact.

The present invention eliminates these drawbacks, and provides an apparatus that can accommodate differences in tube diameter, and even if there is an error in the tube diameter, it can maintain sufficient contact with the outer surface of the tube and provide sufficient cooling. For the purpose of suggestion.

In short, this invention involves automatic circumferential welding of a pipe in which the surface of the water-cooled box facing the pipe is a conical surface, and a plurality of pipe diameter adjustment members each having a conical surface on the outside are positioned between the water-cooled box and the outer surface of the pipe. It is characterized by being a device.

An apparatus according to the present invention will be explained with reference to FIG. Reference numerals are shown corresponding to those in FIG. Water cooling box lla, llb
The shape is like a cylindrical body divided into two. However, in this invention, the surfaces 13a and 13b corresponding to the tubes are conical surfaces. The inner surface of the water cooling boxes lla and llb and the pipe 1
Pipe diameter corresponding adjustment members 15EL and 15b are provided between the outer surface of 4 and
(hereinafter simply referred to as members 15a and 15b) are inserted.

Its outer surface corresponds to the surfaces 13a and 13b of the water cooling box and is a conical surface.

Therefore, by bringing the members 15a and 15b into close contact with the outer surface of the driven tube toward the right in the drawing, errors in the outer diameter of the tube can be eliminated. Therefore, for these members 15a and 15b, it is preferable to use steel, aluminum, or copper-based materials that have good heat transfer coefficients.

In addition, when the pipe diameter changes greatly such as D2, the end face thickness t2
members 15a and 15b' can be used, and one circumferential automatic welding device can perform circumferential automatic welding of pipes with a plurality of different diameters.

By carrying out this invention, it is possible to automatically weld the circumference of tubes having a plurality of different diameters using one device, and for one tube diameter, manufacturing errors occur in the outer diameter of the tube.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional device including the device axis, FIG. 2 is a perspective view of a water cooling box (9), and FIG. 3 is a sectional view of the device according to the present invention including the tube axis. la, It)...Welding head 3 (3a, 3b)...Slide ring 11
a, llb... Water cooling box 13a, 13b.
...Conical surfaces 15a, 15b, 15a, 15b ...Pipe diameter adjustment member Fig. 1 Fig. 2

Claims (1)

[Claims] (1) A welding head having two semi-cylindrical surfaces connected by a hinge is removably attached to a tube for circumferential welding of the tube, but has a water-cooled centering box on the bone contacting surface side, A tube circumferential automatic tube circumference device characterized in that the surface of the water cooling box on the side facing the tube light is a conical surface, and a plurality of tube diameter adjustment members each having a conical surface on the outside are provided between the water cooling box and the outer surface of the tube. Welding equipment. 2. The circumferential automatic welding device for pipes according to claim 1, wherein the pipe diameter adjusting member is made of a material with good heat transfer coefficient.