JPH03133584A - Method for preventing defect of electron beam welding - Google Patents

Abstract

PURPOSE:To prevent the occurrence of a blowhole by inserting a deoxidizing material between two members when the two members are abutted on each other and an abutment part is irradiated with an electron beam to weld the two members. CONSTITUTION:The deoxidizing material 3 is inserted into the abutting faces of the members 1 and 2 as an insert material and the abutment part is irradiat ed with the electron beam to weld the two members 1 and 2. By this method, defects of electron beam welding can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field] The present invention relates to an electron beam welding method, and more particularly to a welding method for preventing defects in electron beam welding.

[Prior art 1] This type of conventional technology uses round bars 10I and 1 as shown in Figure 2.
An electron beam 104 is irradiated onto the abutting portion 103 of the 02, and a wire 105 made of a defect prevention element or mild steel for diluting carbon is melted at the feeding point by a wire feeder 106 at the position where the electron beam 104 is irradiated. As shown in FIG. 3, a groove defect preventing element 3 or a wire 205 of mild steel for carbon dilution is wound around the groove part 2 where the round bars 201 and 202 come into contact, and an electron beam 204 is used to prevent the welding.
jlf! This is a welding method that prevents defects by spraying and melting them together.

[Problems to be Solved by the Invention] Among these conventional techniques, a wire 105 made of mild steel or the like for diluting a defect prevention element or carbon is fed by a wire feeder 106 and melted together to form a wire 105 of mild steel or the like for diluting a defect prevention element or carbon. In a welding method in which the wire 105 is fed by a wire feeder 106 and melted together to prevent defects, there is a problem that the electron beam 104 is thin, making it difficult to adjust the feeding position of the wire 105 and making it easy for the wire 105 to be added discontinuously. In the welding method, a wire 205 made of mild steel or the like for defect prevention element or carbon dilution is wrapped around the groove 203 where the wires 202 come into contact, and the wire 205 is irradiated with an electron beam 204 to melt them together to prevent defects. Since the amount of mild steel used for welding is small, there are problems such as the composition of the welded part is not uniform, and the added elements segregate, resulting in a decrease in strength.

"Means for Solving the Problem" In order to solve the above problem, the invention of claim (1) brings two members into contact with each other, and irradiates the contact portion with an electron beam to remove the two members. In the welding method for welding the
This is an electron beam welding method characterized by inserting a deoxidizing material between the two members.

The invention in claim (2) is the invention in claim (1).
The electron beam welding method was characterized in that the sulfide was replaced by a metal with a higher melting temperature than iron in place of the deoxidizing material described above.

The invention in claim (3) is within the scope of claim (])
The electron beam welding method is characterized in that the deoxidizing material described above is replaced with a low carbon material.

The invention in claim (4) is the invention in claim (1).
The electron beam welding method is characterized in that a thin plate is used instead of the deoxidizing material described above.

The invention of claim (5) is an electron beam welding method characterized in that the sulfide described in claim form 2 is a thin plate of a metal whose melting temperature is higher than that of iron.

The invention according to claim (6) is an electron beam welding method characterized in that the low carbon material according to claim 3 is made into a thin plate.

[Operation] The inventions of claims (1) and (4) eliminate the occurrence of blowholes, and the inventions of claims (2), (3), and (5) eliminate the occurrence of blowholes.
), (6) inventions eliminate the occurrence of cracks.

[Example] FIG. 1, which explains an example of the present invention in detail with reference to the drawings, is a diagram showing a state in which an insert material 3 is inserted into the contact surfaces of a member 1 and a member 2.

Member 1 and member 2 are materials to be welded, and are round bars with a diameter of 85 mm.The convex portion 2-1 and the concave portion 1-1 are fitted and positioned, and the welding conditions are acceleration voltage: 55 KV beam ti! : 160 mA Beam focus: 4.8 A Welding distance: 500 mm/min Table 1 shows the results of electron beam welding with different insert materials and materials to be welded in each example.

In Table 1, NO1 to 3 are conventional welding methods, NO4 to 6 are examples of the present invention, and NOI and 4 are A1, which is a deoxidizing material.
This is an example in which blowholes occurred in the conventional examples, but no blowholes occurred in the examples of the present invention.

NO2 and 5 are examples conducted on 100 test pieces using Ti, which is a desulfurization material. However, in the example of the present invention, no cracking occurred due to the effect of the desulfurizing material T1.

In this example, T1 was used because T1 was combined with S to form TiS.
This is because TiS dilutes S, and since TiS has a high melting temperature, it is effective in preventing hot cracking.

NO3 and NO6 are examples conducted on 100 test pieces using mild steel, 5pCC, which is a carbon dilution material.In the conventional example, cracking occurred due to the influence of C, but in the example of the present invention, carbon dilution was used. The material was effective and no cracking occurred.

[Effect of the invention] The inventions of claims (1) and (4) of the present invention fully exhibit the effect of the deoxidizing material and eliminate the occurrence of blowholes, and the inventions of JR claims 2) and (5) are the desulfurizing material. The effects of the carbon diluting material are fully exhibited and cracks do not occur, and the inventions of claims rff (3), (6) fully exhibit the effects of the carbon diluting material and no cracks occur.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and FIGS. 2 and 3 show prior art. In the figure, 1 and 2 indicate members, and 3 indicates an insert material. Figure 1

Claims (6)

[Claims] (1) In a welding method in which two members are brought into contact with each other and the two members are welded by irradiating an electron beam onto the contact area, a deoxidizing material is inserted between the two members. An electron beam welding method characterized by: (2) An electron beam welding method characterized in that the deoxidizing material according to claim (1) is replaced by a metal whose sulfide has a higher melting temperature than iron. (3) An electron beam welding method characterized in that the deoxidizing material according to claim (1) is replaced with a low carbon material. (4) An electron beam welding method characterized in that the deoxidizing material according to claim (1) is replaced with a thin plate of deoxidizing agent. (5) An electron beam welding method characterized in that the sulfide according to claim 2 is a thin plate of a metal whose melting temperature is higher than that of iron. (6) An electron beam welding method characterized in that the low carbon material according to claim 3 is a thin plate of low carbon material.