JPS61273275A - Beam welding method - Google Patents

Abstract

PURPOSE:To increase the operability in welding by providing the projecting bar cutting off a beam irradiating direction at one part of the joining member. CONSTITUTION:The tip of one part of a joining member 1a is worked in a projection taper shape and the tip of the other part of a joining member 1b is made in recessed taper shape. A projection bar 2 is formed by rising from the position of completing theinner face and taper face of the joining member 1b. Or if necessary a groove 9 is formed by providing a projection part 8 further on the projection bar 2. An electron beam is irradiated along the joint face 3 by engaging the joining members 1a, 1b. The electron beam 4 melts the vicinity of the joint face 3 and one part of the projection bar 2 and forms the bead 5 and URANAMI bead 6 on the surface of the tube. The bead 5 penetrating the joint face 3 is intercepted by the projection bar 2 therefore. In case of providing the groove 9 the spatter treating work is disused, moreover. The protection against the beam thus becomes unnecessary and the operability in welding is increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to electron beam welding, laser beam welding, etc.
The present invention relates to a high energy beam welding method.

[Conventional technology]

Beam welding methods such as electron beam welding and laser beam welding have high energy density and can perform welding with a small amount of heat input, and can also weld thick plates in one pass. In addition, since the amount of heat input is small, thermal distortion and heat affected zone are also small, allowing precision welding.

In this welding method, when welding in one pass, the beam that has penetrated the base metal still retains sufficient energy,
When performing beam welding, measures such as beam shielding were necessary.

Furthermore, when the beam penetrates the base material, back waves are formed, and a large amount of spatter is also generated accordingly.

[Problem that the invention seeks to solve]

As mentioned above, it is necessary to provide a beam shield to prevent the penetrated beam from melting unnecessary parts, which makes one setup complicated and the work efficiency poor. Furthermore, since sputtering treatment must be performed after welding, post-treatment is troublesome.

[Means for solving problems]

The present invention has been made in view of the above-mentioned circumstances, and includes a protrusion that directs the beam irradiation direction on one of the joining members, and further includes a protrusion on either one of the joining members. A sputter reservoir groove is formed along the bonding line.

[For production]

By providing a protrusion, it is possible to weld with a beam that is strong enough to penetrate the joint surface, and the beam that has penetrated can be stopped by the protrusion, so there is no need for a separate beam guard, and a groove can be formed by providing a protrusion. This can prevent spatter from scattering.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a first embodiment, and in the figure (1c) and (16) are tubular joining members, respectively.

The tip of one joining member (1G) has a convex tapered shape,
The other joining member (1b) has a concave tapered tip. Further, the inner surface of the other joint member (1b) is raised from the position where the tapered surface ends to form a protrusion (2).

Fit the joining member (1cLX1&), and the joint surface (3)
An electron beam (4) is irradiated along the line. Electron beam (4
) is made by melting the vicinity of the joint surface (3) and a part of the protrusion (2), forming beads and dots (5) on the pipe surface, and joining member (2) of the protrusion (2).
A Uranami bead (6) is formed at the base of the 1a) side.

That is, due to the presence of the protrusion (2), the bead (5) that penetrates the joint surface (5) is stopped and does not reach the opposite surface, and the protrusion (2) functions as a beam stopper. . Further, by fitting the convex taper shape and the concave taper shape, the joining members (1G) (1b) are aligned, and misalignment during welding is prevented.

In addition, Fig. 2 and Fig. 3 show the fitted state of the joining members (1α) and (1b), and Fig. 2 shows that the inner joining line (7) of both is in front of the protrusion (2). FIG. 3 shows the case where the joining line (7) is inserted into the protrusion (2).

Figure 4 shows a protrusion (8) facing the protrusion (2) and the entire inner circumference.
), and a groove (9) for a sputtering groove is carved on the facing surface of the protrusion (8), and a gap 2 is provided between the protrusion (2) and the protrusion (8) for gas venting. This is provided.

FIG. 5 shows still another example, in which the protrusion (8) is formed into a hook shape and provided with a groove (9), one portion of which overlaps the protrusion (2).

The example shown in FIG. 6 is a case where a protrusion (8) is provided on the protrusion (2).

Figure 7 shows the joint surface (3) of the joining members (1cL) (1b) as a plane including the radius, and the α value of the fitting cylinder part protruding from the protrusion (2) formed on one joining member (1b). and a fitting cylinder part α [
Form a step αυ that fits with the

In this embodiment, the fitting cylinder part (1G acts as a beam stopper, and the groove (9) is formed by the protrusion (2) and the protrusion part (8). Also, the fitting cylinder part (11m and the step αυ By fitting, the joining member (IGX16) is aligned and deformation during welding is restrained.

FIG. 8 shows an example of application in which the present invention is applied to the manufacture of a rotor for a multi-stage centrifugal compressor.

Previously, multiple impellers (joint members) were shrink-fitted onto the shaft and fixed with pins, which caused looseness over time and accidents such as pin breakage. Since there is a mating function, there is no need for a shaft and the weight can be reduced, and since each joining member is joined by welding, it is possible to prevent the occurrence of accidents as in the past.

(Effects of the Invention) As described above, according to the present invention, the fft-
In addition, by providing grooves for vine grooves, sputtering treatment is no longer necessary, so work efficiency in electron beam welding can be significantly improved, and the width of the back surface protrusion can be adjusted in advance to resume processing. If the dimensions are such that impellers, etc. can be easily replaced and repaired.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing changes in this embodiment, and FIGS. 5 to 7 are respective illustrations of other embodiments of the present invention. FIG. 8 is an explanatory diagram showing an application example of the present invention. (1a) and (1b) are joint members, (2) is a protrusion, (8) is a protrusion, and (9) is a groove. Figure 1 Figure 2 Figure 5 Figure 6 Figure 7 Figure 8 Procedural amendment (method) September 2, 1985 Director General of the Patent Office Michi Uga, Department 1, Indication of the case 1985 Patent Application No. 115669 2, Name of the invention Beam welding method 3, Relationship with the amended case Patent applicant: 2-2-1 Otemachi, Chiyoda-ku, Tokyo (009) Ishikawajima-Harima Heavy Industries Co., Ltd. 4, Agent: Tokyo Yahagi 2nd Building 5, 3-5-3 Uchikanda, Chiyoda-ku, Tokyo Date of amendment order: August 7, 1985 (Shipping date: August 27, 1985) 7, Brief explanation of the drawings in the statement of contents of amendment Correction in the column ``Figures 5 to 7'' in line 12 of page 6 is corrected to ``Figures 4 to 7''. that's all

Claims (1)

[Scope of Claims] 1) A beam welding method characterized in that a protrusion is provided on one side of the joining member to block the beam irradiation direction. 2) Beam welding characterized by providing a protrusion that blocks the beam irradiation direction on one side of the joining members and providing a protrusion on one of the joining members to form a sputter reservoir groove along the joining line. Method.