JPH02192880A - Method and jig for welding t-type pipe - Google Patents

Abstract

PURPOSE:To increase welding strength and to improve external appearance by working the end face of a pipe larger than the radius of the side periphery of a pipe to be welded so that the cylindrical surface having the specific radius exists and performing butt welding thereon. CONSTITUTION:The end face of the other pipe 1 is abutted on the side of one pipe 2 and subjected to resistance welding to form the T-type pipe. The end face of the other pipe 1 is then worked larger than the radius (r) of the side periphery of the one pipe 2 so that the cylindrical surface having the radius R not exceeding 1.25 times of the radius (r) exists. The end face of the pipe 1 is then abutted on the side of the pipe 2 and subjected to butt welding. A groove having a cylindrical inside shape is provided on an electrode holding the pipe. By this method, the pipe is easily worked.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a T-shaped pipe welding method and a welding jig.
In particular, the present invention relates to a welding method and a welding jig for T-shaped pipes that are easy to process and provide good appearance and strength.

[Prior Art] A conventional welding method for a T-shaped vibrator will be explained with reference to FIGS. 4 to 6.

As shown in FIG. 4, the end face of the pipe 1 is processed into a cylindrical inner surface shape equal to the radius r of the outer circumference of the pipe 2, and the end face is pressed against the side surface of the pipe 2, and an electric current is applied between the welding electrodes in contact with both pipes. When flowing, heat is generated due to the resistance of the contact surfaces of both pipes, and the end surfaces of the pipes are welded, producing a 1-inch-shaped pipe as shown in FIG.

However, in this welding method, pipe 1 and pipe 2 come into surface contact, so in order to form a projection that reduces the initial contact area, it is necessary to perform a three-dimensional chamfering operation on the end face of pipe 1. .

Furthermore, it takes time and effort to precisely match the radius of the pipe 1 and process it into a cylindrical shape, and there is a problem in that processing the end face of the pipe becomes extremely expensive.

Therefore, as shown in Fig. 6, the end surface of the vibrator 1 is machined into a flat shape so that the vibrator 1 and the pipe 2 are initially in line contact to form a projection, and the pipe 1 is melted into the T. A method of manufacturing shaped pipes has been proposed. (Refer to Japanese Unexamined Patent Publication No. 57-175086) [Problems to be Solved by the Invention] However, in the above-mentioned pipe where the end surface of the pipe is machined into a flat surface, the penetration of the pipe end surface is large and the appearance is not good, and it is difficult to obtain high welding strength. The problem was that I couldn't do it.

The present invention has been made to solve the above-mentioned problems, and aims to provide a T-shaped pipe welding method and welding jig that allows easy processing of the end face of a vibrator and provides good appearance and welding strength. .

[Means for Solving the Problems] The T-shaped pipe welding method of the present invention includes butt resistance welding the end face of one pipe to the side surface of the other pipe. 1.2 which is larger than the radius of the outer circumference of the side surface of said one pipe and has the same radius.
The pipe is machined so that it has a cylindrical surface with a radius not exceeding 5 times, and the end surface is butted against the side surface of the pipe.

In addition, the welding jig for the 1" type vibrator of the present invention is a T-type which butts and resistance welds the end surface of one pipe to the side surface of the other pipe.
In a welding jig for shaped pipes, a part of the end surface of the welding electrode that grips the other pipe has a cylindrical inner surface shaped groove with a radius larger than the radius of the outer periphery of the side surface of the one pipe and not exceeding 1.25 times the same radius. It is processed to form.

[Operation] Since the end face of the pipe is machined to have a radius larger than the radius of the side surface of the vibrator to be welded, the abutting surfaces initially form a line contact, which is essentially the same as forming a projection. In addition, the electrode that grips the pipe whose end surface has been processed to have a predetermined diameter forms a cylindrical groove with a radius that is larger than the radius of the side surface of the pipe to be welded, but does not exceed 1.25 m. Since the welded pipe is processed, the relief part of the metal material of the welded pipe is formed in a desirable shape, which further increases the welding strength and improves the appearance.

Embodiment j An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figures, parts having the same functions as those shown in the conventional example are given the same reference numerals.

As shown in FIG. 1, the end face of the pipe 1 is processed into a cylindrical shape with a radius R larger than the radius r of the outer circumference of the pipe 2.

However, r<R≦1.25r.

If R is larger than 1.25r, the penetration of the pipe will increase and the effect of the present invention will be reduced.

As shown in FIG. 2, the lower welding electrode 3.3 that grips the pipe 1 along its side circumference is a part of a cylindrical surface whose center part has a radius R larger than the radius r of the outer circumference of the pipe 2. The cylindrical surfaces 3a, 3a are machined to form grooves.

The portions on both sides of the cylindrical surfaces 3a, 3a are processed into cylindrical surfaces 3b, 3b having a radius even larger than R. By doing this, when the pipe 2 is placed on the cylindrical surfaces 3a, 3a of the welding part [3, 3 and held under pressure with the welding electrode on the upper side (not shown), the pipe 2 Even if it is bent, the pipe 2 and welding electrode 3 are
3 can be prevented from touching.

Welding TF! The surface 3c for gripping the pipe 1 in 3.3 is made to have the same radius as the outer circumference of the pipe 1. When these welding electrodes 3.3 grip the pipe 1, pressure is applied to the upper welding electrode (not shown), and the pipe 2 placed on the cylindrical surfaces 3a, 3a of the welding electrodes 3.3 is The side surface is pressed against the end surface of the pipe 1 and energized to perform welding.

FIG. 3 shows another embodiment of the welding jig according to the present invention, and shows a welding jig suitable for welding the end face of a pipe 1 with a small diameter to the side face of a pipe 2 with a larger diameter. There is.

In this welding jig, the cylindrical surfaces 3a, 3a of the welding electrode 3.3
The pipe 1 is machined so that its diameter is larger than the outer diameter of the pipe 2, and the pipe 1 is welded by the welding electrode 3.3 so that the end surface of the pipe 1 protrudes from the groove surface formed by the cylindrical surfaces 3a, 3a. It is gripped almost in the center of the groove surface.

Although the embodiment of the present invention is configured as described above, the invention is not limited thereto. For example, the contact angle of the pipes is not limited to a right angle, and the pipes to be welded may be curved.

[Effects of the Invention] As explained above, in the present invention, since the end face of the pipe is processed to have a radius larger than the radius of the side face of the pipe to be welded, the initially abutting surfaces become line contact and substantially form a projection. Therefore, there is no need for three-dimensional chamfering, making it easy to process the pipe. In addition, since there is little penetration, the appearance and welding strength are good. Furthermore, the radius of the welding electrode that grips a pipe whose end surface has been processed in a predetermined manner is larger than the outer circumference of the side surface of the pipe to be welded.
Since the cylindrical groove is machined with a radius not exceeding 25 times, it is possible to form a relief section for the molten metal of the pipe whose end faces are butt welded in a favorable shape, thus further increasing the weld strength and improving the appearance. I can do well.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a pipe processing state according to an embodiment of the present invention, Fig. 2<a) is a top view showing a welding electrode of the same embodiment, Fig. 2(b) is a front view of the same, and Fig. 3 4 is a plan view showing a state of pipe processing in the prior art, FIG. 5 is a front view showing a T-shaped vibrator, and FIG. 6 is a plan view showing another embodiment of the present invention.
The figure is a plan view showing a state of pipe processing in another conventional technique. 1...pipe, 2...pipe, 3...welding electrode,
3a... Cylindrical surface. Agent Patent Attorney Shiba 1) Masao Figure 3 (b) Figure 2 Figure Figure Figure

Claims (1)

[Claims] 1. In a T-shaped pipe welding method in which the end face of the other pipe is butt-resistance welded to the side surface of one pipe, the end face of the other pipe is set closer to the radius of the outer periphery of the side surface of the one pipe. A method of welding a T-shaped pipe by processing the pipe so that it exists on a cylindrical surface with a radius not exceeding 1.25 times the same radius, and by butting the end surface against the side surface of the pipe. 2. In a T-shaped pipe welding jig for butt-resistance welding the end face of one pipe to the side of the other pipe, a part of the end face of the welding electrode that grips the other pipe has a radius of the side face of the one pipe. A welding jig for a T-shaped pipe that is machined to have a groove in the shape of a cylindrical inner surface with a radius that is larger and does not exceed 1.25 times the same radius.