JPS635873A - Welding method for pipe and pipe - Google Patents

Abstract

PURPOSE:To perform the welding of both pipes having sufficient strength without the feeding of a wire by inserting the pipe of one part subjected to a bead working to form a projecting part to the external part near the end part and depositing in this state the vicinity of both pipes end part with its heating and melting. CONSTITUTION:A projection part 3 is formed to the external part by a bead working at the position slightly retreating from the end of a pipe 1 thereon in the pipe 1 and pipe 2 with the same Al as the main raw material, for instance. A receiving part 4 is formed by expanding the opening end of the pipe 2 in the same degree as the external shape dimension of the pipe 1. The tip of the pipe 1 is then inserted into the receiving part 4 of the pipe 2 and the vicinity of the projection part 3 of the pipe 1 and receiving part 4 is deposited with the heat welding by an arc welding machine 5 be welded in a constant uniform thickness. In this way, the use of an automatic welding machine is enabled because of a wire feeding device being disused even in case of the pipe in a complicated shape.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of welding pipes together.

(Prior Art) Conventionally, pipe-to-pipe welding is generally performed using arc (TI) welding.
G) Welding is adopted, as shown in Figure 3, rain pipe A,
While adding filler metal (wire) C to the welded part B, the welding machine was manually operated and the position was gradually changed to weld the entire circumference of the pipe.

(Problems to be solved by the invention) However, the TIG welding requires extremely skill;
This required a large amount of man-hours and was one of the causes of increased costs.

As a countermeasure for this, automated welding machines have been developed in recent years, but they are equipped with a wire (filler metal) supply device that rotates the torch, and depending on the shape of the pipe to be welded, this wire supply device However, due to interference, automation was not possible.

So I removed the wire and tried welding it, but it was impossible to weld it.

Therefore, in this invention, welding between pipes,
The present invention provides a welding method that can be performed without wires.

(Means for solving problems) The gist of this invention is near the end of one pipe.

The process involves applying a bead process to form an outwardly protruding part, inserting this one pipe into the other pipe, and heating and melting the protruding part of one pipe and the vicinity of the end of the other pipe to weld them. .

(Function) The shagging force is capable of melting the protrusion formed on one pipe and welding it to the other pipe, thereby making wireless welding possible.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, pipe 1 and pipe 2 are manufactured using the same aluminum as the main raw material in this example.

The pipe 1 has an outwardly protruding portion 3 formed by bead processing at a position slightly set back from the end thereof.

The open end of the pipe 2 is expanded to the same extent as the external dimensions of the pipe 1, and a receiving portion 4 is formed.

When the processing of the one-pipe pipe 1.2 is completed in this way, the tip of the pipe 1 is inserted into the receiving part 4 of the pipe 2, and then the vicinity of the protruding part 3 and receiving part 4 of the pipe 1 is Weld by heating and melting the entire circumference. As a result, as shown in FIG. 2, the welded portion 6 is welded to have a constant and uniform thickness.

That is, by providing extra thickness in the protrusion 3, it is possible to perform welding with sufficient strength and thickness even without wire.

(Effects of the Invention) As described above, according to the present invention, welding with sufficient strength can be performed without supplying wire.

Therefore, even if the pipe has a complicated shape, it is possible to use an automatic welding machine because it does not have a wire feeding device.

For this reason, it can also contribute to cost reduction.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of welding according to the present invention, Fig. 2 is a half sectional view showing a welding state according to the invention, and Fig. 3 is a half sectional view showing a conventional example of welding while supplying wire. It is a diagram. 1...one pipe, 2...the other pipe. 3... Protruding part, 4... Receiving part, 5... Welding machine.

Claims (1)

[Claims] Bead processing is applied to form an outward protrusion near the end of one pipe, and this one pipe is inserted into the other pipe, and the protrusion of one pipe and the vicinity of the end of the other pipe are heated. A pipe-to-pipe welding method characterized by melting and welding.