JPS58386A - Production of joint by electron beam welding - Google Patents

Abstract

PURPOSE:To prevent the generation of blow holes and the oxidation of molten metal by welding the faying surfaces of both joints after evacuating the void parts produced at these faces. CONSTITUTION:An engaging projection 3 of a joint member 1 and an engaging hole 6 of a joint member 4 are fitted to each other to contact faying surfaces 2, 5 tightly. The members 1, 4 are put in a vacuum vessel and the air in void parts 9 is removed through line grooves 7 to create a vacuum state. Electron beams are irradiated to the faying surfaces 2, 5 to weld the surfaces 2, 5 to each other, whereby a shaft joint is obtained. The generation of blow-holes in the weld zones and the oxidation of molten metal are prevented and the quality of the joint is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a joint by electron beam welding, in which a part to be welded is irradiated with an electron beam in a vacuum and welding is performed using the impact heat generation.

Conventionally, a joint made by electron beam welding has a retaining protrusion 13 on the joint surface 12 of the first joint member 11, as shown in FIG.
An engagement hole 16 is provided in the joint surface 15 of the second joint member 14, and the engagement protrusion 13 and the engagement hole 16 are tightly fitted and the mutual joint surface 12.15 were brought into close contact with each other, and then the joint surfaces 12.15 were electron beam welded. However, the fitting between the joint member f1 (2) of @1 and the engagement hole 16 of the second joint member 14 and the close contact between the joint surfaces 12 and 15 of the joint surface 1241
Since a sealed cavity 19 is formed at the inner end of 5, □
When the mutual joint surfaces 12 and 15 are welded with electron beams, holes 21 to 21 are generated in the welded part 20 due to the air trapped in the gap 19, as shown in Figure 211 and 6. However, there were problems with the quality of the fittings as the molten metal could become oxidized.

Therefore, an object of the present invention is to provide a method for manufacturing a joint by electron beam welding, which can prevent the occurrence of blur holes and oxidation of molten metal.

Hereinafter, one embodiment of the present invention will be described with reference to Figures 1g1 to 481. In the shaft joint shown in cross section in FIG. 1, an engaging protrusion 3 is provided on the joint surface 2 of the first joint member 1 in a cylindrical shape protruding from the same axis as the joint member 1. As shown in FIG. on the other hand,
The joint +15 of the joint member 4 of $2 is provided with an engaging hole 6 which is coaxial with the joint member 4 and is recessed so that the engaging protrusion 3 can be tightly fitted therein. In the joint Ify5 of the second joint member 4, as shown in FIGS. Notches are formed. This groove 7 is formed in an rf1 linear shape with an angle of 0 relative to the straight line in the radial direction of the joint 1ffi5. Important, angle,
In FIG. 1, reference numeral 8 denotes a relief hole provided in the second joint member 4, through which the bottom of the retaining hole 6 communicates with the outside.

The engagement protrusion 3 of the first coupling member 1 described above and the engagement hole 6 of the coupling member 4 of l@2 are tightly fitted, and the mutual joint surfaces 2.5 are aligned as shown in FIGS. Place them close together as shown in the diagram.

Then, the joint member 1.4 is placed in a vacuum chamber equipped with an electron beam welding device (not shown), and the inside of the vacuum chamber is brought into a vacuum state. From this K, the joint surface 2.5 of the joint members 1 and 4
The air in the gap 9 at the inner end is extracted through the groove 7, and the gap 9 is brought into a vacuum state.
．． By irradiating the joint surfaces 2.5 of 4 with electronic beef (see the arrows in Figure 2) and using the impact heat generated, weld the joint surfaces 2.5 together as shown in Figure 3. Joints can be made.

That is, electron beam welding is performed while the cavity 9 is in a vacuum state. However, 1III while welding 7 grooves! 1 metal flows in and fills up. In addition, the third
In the figure, reference numeral 10 indicates a welded portion.

After that, the shaft coupling can be removed from the vacuum chamber.

In addition, the grooves 7 in the above embodiment are the same as those in the first joint member 1.
or both the joint surfaces 2 and 5 of the am hand member 1.4, and the groove 7 may be provided on the joint surface 2 of the II! It is not limited to a linear shape, but may be curved and run.

That is, in this invention, the joint surfaces of the joint members and the gap formed by K are brought into a vacuum state, and the joint surfaces are welded together. Oxidation of the molten metal can be prevented, and the quality of the joint can therefore be improved.

[Brief explanation of drawings]

Figures 1 to 4 show examples of this invention.
Figure 1 is a cross-sectional view of the shaft joint, Figure 2 is the first cross-sectional view of the shaft joint before welding.
Figure 3 is an enlarged view of part A in Figure 1 after welding, Figure 4 is an enlarged view of the joint surface of the second joint member, and Figures 5 and 6 show conventional examples. 5 is a sectional view of the shaft joint, and FIG. 6 is an enlarged view of section B in FIG. 5. 1... First joint member 2... Joint surface 3--engaging protrusion 4-- Second joint member 5... Joint surface
6...Hole hole 7...Article, groove Patent applicant: Tohri Jikasha Kogyo Co., Ltd. Agent Rokubaji Oka 1) Hidehiko No. 1
Figure 2 Figure 411 31st! f9

Claims (1)

[Claims] A retaining protrusion is provided protrudingly on the joint surface of the first joint member, and wc2
A retaining hole that can be tightly fitted to the engaging protrusion is formed in the joint surface of the joint member, and a retaining hole that can be tightly fitted to the engaging protrusion is formed in at least one of the joint surfaces of the joint members. The method is characterized by providing a strip 14 leading to the engagement hole, fitting the engagement protrusion and the engagement hole, and bringing the mutual joint surfaces into close contact with each other, and then electron beam welding the mutual joint surfaces to form a joint. A method for manufacturing joints by electron beam welding.