JPS5881589A - Welding method for piping - Google Patents

Abstract

PURPOSE:To absorb errors in the dimensional accuracy of piping and to weld pipings without welding rods by disposing rings onto both ends of a sleeve which joins both pipings indirectly and sleeves 2 on the outer sides of the rings respectively then melting the rings. CONSTITUTION:After a piping 5 is first set, a sleeve 2, a ring 3, as sleeve 4, a ring 3 and a sleeve 2 are positioned onto the piping 5 successively and a piping 1 is so set with the sleeve 4 that the groove face thereof is mated with the groove face of the piping 5. The sleeve 2, 4 and the rings 3 are brought into tight contact with each other. Thereafter, a torch of a welder is located at the center of the rings 3 and an arc is generated to melt and join the sleeves 4, 2, 2, the pipings 1, 5 and the rings 3, 3 together. If penetration beads are produced in this case, this welded joint has the strength equal to that of the base materials.

Description

[Detailed description of the invention] The present invention relates to a pipe welding method.

Traditionally, piping welding methods (the second method is the butt method and the sleeve method)
The former butting method requires a jig for groove alignment and groove alignment, which is a process before pipe beveling and welding. It was necessary to strictly control installation errors. In addition, in the latter sleeve method, there is no need to perform beveling, and the eccentricity of the piping can be absorbed by changing the length and diameter of the sleeve, and the piping dimensions and installation errors are
It can be made looser than the former butt method, but automatic welding is performed (a welding rod must be used for each hit, so
It was thought that the cost of welding would increase by ≦1.

``Honzurari'' was made in view of the above circumstances (1),
It is an object of the present invention to provide a method for welding pipes that can absorb the dimensions of pipes and installation errors, and can also be welded without a welding rod.

In order to achieve the above-mentioned rigidity (2), the pipe welding method according to the present invention includes a pipe, a first sleeve which is a joint material for the pipe, and a pipe welding method which is located at both ends of the first sleeve and whose outer diameter is It consists of a ring whose inner diameter is larger than the outer diameter of the sleeve and whose inner diameter is the same as the inner diameter of the sleeve, and a sleeve of '@' TJ2, which is placed at one end of the ring (25T each), and a torch (2) is used to melt the ring and 1st ° 2nd sleeve and F*:
It is constructed so that it is integrated with the piping described in 1. (2144).

Hereinafter, one embodiment of the pipe welding method of the present invention will be described with reference to the drawings.

Figure 1 is a component configuration diagram of the present invention, and shows the base material piping (1
) and (5), a sleeve (short pipe) for indirectly joining two pipes together (4), and rings (3), (3) to replace the welding rods at both ends of the sleeve (4). , and a sleeve (
2) respectively. The ring (3) has an outer diameter larger than the sleeve outer diameter and an inner diameter the same as the sleeve inner diameter.

Welding (in the second part, first set the pipe (5), then attach the sleeve (2), ring (3), and sleeve (4) to the pipe (5).

Pass through the ring (3) and sleeve (2) in this order ≦ 2 times, then pipe (1
Set the sleeve (4) so that the groove direction of ) matches the groove surface of the pipe (5), as shown in Figure 2 (=sleeve (2)).

(4) and ring (3) are brought into close contact. Then, place the welding machine's torch at the center of the ring (3) and generate an arc to melt the sleeve, base metal pipe, and ring together. Figure 3 shows a cross section of the pipe after welding. be.

As shown in Fig. 3, if the sleeve, base metal piping, and ring are the original components, and if there is a back wave, it is possible for this welded joint to have the same strength as the base metal.

As stated above (2. Using the pipe welding method of the present invention (-), therefore, during automatic welding (2. Eccentricity of both pipes and piping installation accuracy can be easily absorbed by changing the length and diameter of the sleeve. , construction can be made easier and more economical without worrying about groove alignment or bath welding rods.

4. Drawings 1^] Simple Explanation Figure 1 is a configuration diagram of parts of the present invention, Figure 2 is a sectional view of a construction example using the parts, and Figure 3 is a sectional view after welding.

1.5...Base material arrangement 2.4...Sleeve (short pipe) 3...
·····ring

Claims (1)

[Claims] A pipe, a first sleeve which is a joint material for the pipe, and the first sleeve.
The torch consists of a ring located at both ends of the sleeve, the outer diameter of which is wider than the outer diameter of the sleeve, and the inner diameter of which is the same as the inner diameter of the sleeve, and a second sleeve that is in close contact with one end of the ring. The ring is melted at
．． A method for welding pipes, characterized in that the second sleeve and the pipe are integrally formed.