Electric heating – Metal heating – By arc
Patent
1992-03-12
1994-08-30
Albritton, C. L.
Electric heating
Metal heating
By arc
219118, B23K 2600
Patent
active
053430140
DESCRIPTION:
BRIEF SUMMARY
FIELD OF TECHNOLOGY
The present invention relates to a method of welding metal members of different kind in such a manner that different kinds of metal members are put on each other and lasers are irradiated from the side of one of the metal members.
BACKGROUND TECHNOLOGY
Recently, laser beam machining has been also applied to the field of welding. Since laser beam machining is conducted by a heat source of extremely high energy density, thermal effect is small in the portions other than a portion irradiated with lasers, so that minute portions or parts required high accuracy can be welded under the condition of low strain. Further, lasers not attenuate in atmosphere, and generates no X-rays. Therefore, laser welding can be conducted in atmosphere, and there is no restriction on the shape and size of members to be welded.
However, as shown in FIGS. 7(a)-7(d), when a copper member 1 was put on an iron member 3 and the copper member 1 was irradiated with lasers 5 to weld the copper member 1 and the iron member 3, the copper member 1 melted first as shown in FIG. 7(a), and melting of the copper member 1 progressed as shown in FIG. 7(b). When the melting zone of copper member 1 had reached the iron member 3, a portion of the iron member 3 irradiated with lasers 5, was scattered. Accordingly, a hole was formed in the members as shown in FIG. 7(c). In the drawings, numeral 6 is a metal layer which was melted by lasers, and numeral 61 is a metal particle which was scattered.
In order to prevent the iron member 3 from scattering, laser input (referred to as laser irradiating power, hereinafter) was reduced. Then, a problem arose in which the copper member 1 did sufficiently melt so that welding could not be conducted.
The inventors earnestly investigated the cause of the aforementioned problem. As a result, they found that the cause was the laser reflection factor of each metal member to be welded.
It is a primary object of the present invention to positively weld different kinds of metals, paying attention to the laser reflection factor.
DISCLOSURE OF THE INVENTION
In order to accomplish the aforementioned object, the method of welding metals of different kind by laser according to the present invention is a method of welding at least two kinds of metal members, the laser reflection factors of which are different from each other, in such a manner that the metal members are put one upon another and irradiated with lasers which are emitted in the direction perpendicular to the surface of the metal members. The welding method of the present invention comprises a process in which the first metal member is put on the second metal member. In the aforementioned process, the first metal member has the first laser reflection factor, and the second metal member has the second laser reflection factor which is lower than the aforementioned first laser reflection factor. The first and the second metal member are put one upon another through a metal layer. When irradiated with lasers, said metal layer is more difficult to melt than the aforementioned second metal member. The welding method of the present invention further comprises a process in which lasers are irradiated from the side of the aforementioned first metal member.
As the first embodiment, the aforementioned metal layer has a laser reflection factor which is approximately the same as that of the second metal member, and is made of a metal having a melting point higher than that of the second metal member. As the second embodiment, the metal layer is made of a metal having a laser reflection factor, of a value which is between the laser reflection factor of the first metal member and that of the second metal member.
That is, the first metal member, the laser reflection factor of which is higher than that of the second metal member, is irradiated with lasers emitted on the first metal member side which can melt the first metal member. Consequently, the laser output is sufficiently high to melt the second metal member. However, according to the aforementioned m
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Miyase Yoshiyuki
Ogino Akihiko
Sakou Shuuzi
Shibata Shinzi
Albritton C. L.
Nippondenso Co. Ltd.
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