JPS6044078B2 - Welding method for laminated thin plates - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding method for welding stacked thin plates using an electron beam or a laser beam.

Next, a conventional method for butt welding laminated thin plates using electron beam welding will be described.

FIG. 1 is a perspective view showing a conventional method. As shown in FIG. 1, the welding end surfaces of the laminated thin plates 1, which are the materials to be welded, are aligned and butted. Further, both sides of the laminated thin plate 1 are tightly fixed with fasteners 2 at the welded end face or at a position at a predetermined distance from the welded end face, and then the electron beam 4 is irradiated along the weld line 3 to accomplish welding. was. Even if electron beam welding is used, which has high energy density and requires a small amount of heat input,
In the conventional butting method, the adhesion between the laminated thin plates was poor.

That is, although the thin laminated plates 1 were in close contact at a position slightly away from the weld line 3, the thin laminated plates 1 could not be brought into close contact at the position of the weld line 3. As a result, voids were created between the thin plates, which caused welding defects such as splitting and blowholes in the welded parts. Furthermore, the thin plates near the surface of the portions that are not in close contact are distorted by the heat of fusion during welding, causing them to peel off.

The occurrence of these welding defects is particularly significant when welding metals with good thermal conductivity such as copper and aluminum. This invention was made to eliminate the drawbacks of the conventional method as described above, and by bringing the thick plate into contact with the surface of the laminated thin plate at the weld line and bringing them into close contact,
The purpose of this method is to prevent thin plates from peeling off during welding and to prevent welding defects such as blowholes from occurring, and to obtain a welded part with an appropriate fusion width.

2 and 3 are perspective views showing embodiments of the present invention, respectively, and FIG. 2 is a view showing a butt welded joint of laminated thin plates made of the same material.

The holding plate 5 is made of the same material as the laminated thin plate 1, and the welding line 3
It has a length spanning the entire length of , and has a thickness that has enough rigidity to allow the laminated thin plate 1 along the weld line 3 to be tightly attached by tightening both ends with the fasteners 2. Third
The figure shows a butt welded joint of laminated thin plates made of different materials. Plate 5a, laminated thin plate 1b and holding plate 5b
It is made of different materials. First, butt welding of laminated thin plates made of the same material as shown in FIG. 2 will be explained.

First, the welded end faces of the laminated thin plates 1, which are the materials to be welded, are aligned and butted. Both surfaces of this abutting portion are sandwiched between presser plates 5 having the required thickness and made of the same material as the laminated thin plate 1, and the presser plates 5 are further tightened together with the fastener 2 to tighten the laminated thin plate 1! Let them wear it. Thereafter, an electron beam 4 is irradiated along the welding line 3 of this butt portion to melt the holding plate 5 and the laminated thin plate 1 together, thereby achieving welding. Also, in the case of butt welding of laminated thin plates made of different materials as shown in Fig. 3, the above method is applied.
Each of the laminated thin plates 41a and 1b is sandwiched from both surfaces by holding plates 5a and 5b made of the same material as the respective ones, and the laminated thin plates 1a and 1b are brought into close contact by tightening with the fastener 2, and then irradiated with an electron beam 4, Pressing plates 5a, 5b
At the same time, the laminated thin plates 1a and 1b are welded. According to the above method, electron beam welding of the thin laminated plates is performed through the presser plate on the front surface, so that the presser plate adheres the thin laminated plates and serves as a heat absorbing material. It prevents peeling, forms an appropriate melting width, and further reduces gaps between thin plates to prevent blowholes and form a complete melted part. In the above embodiment, a flat plate was used as the presser plate, but in FIGS. 4, 5, and 6,
An example in which this presser plate is bent into a U-shape is shown.

That is, what is shown in FIGS. 4 and 5 is an example of butt welding of laminated thin plates made of the same material, and 6 is a laminated thin plate 1.
The presser plate 6 is made of the same material as shown in Fig. 4. An example is shown in which the holding plate 6 is bent into a U-shape in three tangential directions, and FIG. 5 shows an example in which the presser plate 6 is bent into a U-shape in a direction perpendicular to the welding line 3. Further, FIG. 6 shows an example of butt welding of laminated thin plates made of different materials, in which the holding plate 6a is made of the same material as the laminated thin plate 1a, the holding plate 6''b is made of the same material as the laminated thin plate 1b, and the holding plate 6a is made of the same material as the laminated thin plate 1b. , 6b are bent into a U-shape in the direction of the welding line.Furthermore, the laminated thin plate 1a and the holding plate 6
a, the laminated thin plate 1b, and the holding plate 6b are different materials. Generally, when the metal to be welded is a material with a relatively high elastic modulus such as carbon steel or stainless steel, the holding plates 6, 6a, and 6b are bent into a U-shape as shown in FIGS. 4, 5, and 6. The elasticity of the presser plate can be improved by installing it on or along the weld line 3, and then using fasteners to bring both ends of the presser plate into close contact with the laminated thin plate as shown in FIGS. 2 and 3. Strain energy is applied in the direction of the laminated thin plates, which has the effect of making the laminated thin plates stick together more uniformly than in the case of flat plates.
In addition, in the above embodiment, butt welding between laminated thin plates is explained, but butt welding between laminated thin plates and thick plates,
Alternatively, the same effect can be obtained by lap welding of laminated thin plates, and the same effect can be obtained by laser welding as in the above embodiment.

As detailed above, in the method for welding a laminated thin plate according to the present invention, presser plates of a required thickness are brought into contact with both main surfaces of the laminated thin plate including the weld line or along the weld line,
These holding plates are tightened together and welded by irradiating an electron beam or laser beam along the welding line, which prevents the laminated thin plates from peeling off during welding and blowholes, and forms a welded part with an appropriate fusion width. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional butt welding method for laminated thin plates using an electron beam, FIGS. 2 and 3 are perspective views showing an embodiment of the present invention, and FIGS. 4, 5, and 6 respectively. The figures are perspective views showing other embodiments of the invention. In the figure, 1, 1a, 1b are laminated thin plates, 2 is a fastener,
3 is a welding line, 4 is an electron beam, 5, 5a, 5b, 6, 6
a and 6b are holding plates.

Claims (1)

[Claims] 1. A method of welding a laminated thin plate and a laminated thin plate or a laminated thin plate and a thick plate by irradiating an electron beam or a laser beam along a welding line, in which the A presser plate made of the same material as the laminated thin plate and having a required thickness is brought into contact with the laminated thin plate including the weld line or along the weld line, and the presser plates are tightened together with a fastener and irradiated with an electron beam or a laser beam. A method for welding laminated thin plates, characterized by: 2. A method for welding a laminated thin plate according to claim 1, which comprises welding a laminated thin plate and a laminated thin plate made of the same material as the laminated thin plate. 3. A method for welding a laminated thin plate according to claim 1, which comprises welding a laminated thin plate and a laminated thin plate made of different materials. 4. A method for welding laminated thin plates according to any one of claims 1 to 3, characterized in that a presser plate of a flat plate is tightened. 5. The method for welding laminated thin plates according to any one of claims 1 to 3, characterized in that a presser plate having a U-shaped bend in the direction along the welding line is tightened. 6. The method for welding laminated thin plates according to any one of claims 1 to 3, which comprises tightening a presser plate having a U-shaped bend in a direction perpendicular to the welding line.