JP3410590B2 - Laser welding method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser welding method for welding conductive members such as terminals. In general, a conductive member is electrically conductive,
Metal materials (such as pure copper or F-tech, brass, aluminum, etc.) are used. Further, the plate thickness increases as the current capacity increases. Caulking or resistance welding has been used as a method for joining conductive members made of such metal materials, but in recent years, the use of laser beam welding, which is advantageous in terms of maintenance, dimensional accuracy, etc., has been studied. It is coming. The above-described welding by laser light is performed by irradiating a conductive material, which is a welding member, with laser light, but a conductive material such as copper reflects laser light. It was easy to weld, and it was difficult to weld the thick plates. The present invention has been made in view of the above problems, and an object of the present invention is to provide a laser welding method capable of easily performing welding even with a thick plate welding member. In order to achieve the above object, according to the first aspect of the present invention, there is provided a laser welding method for welding a welding member to a member to be welded by irradiating the welding member with a laser beam. The laser is applied to the laser irradiation part of the member.
Has an inclination equal to or greater than the light irradiation angle and opens from the bottom side.
A taper is provided on the inner wall so as to spread toward the mouth side.
The bottom surface to form a recess of the rough surface, characterized by irradiating a laser beam to the bottom surface of the recess of this, the irradiation site of the laser light is able to thin by the recess, welding member plank In this case, the rod can be easily welded like a thin plate. The or recess can be minimized, and the recess
It is possible to suppress the reflection of laser light at the bottom of
Therefore, welding can be made easier. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows a case where two terminals 1A and 1B made of copper, for example, are overlapped and welded so as to be orthogonal to each other. As the welding member, the recesses 2 are formed in advance by press working or the like at two locations where the laser beam on the surface of the terminal 1A on the welding member side is irradiated, that is, at two welding sites. As shown in FIG. 1 (b), the concave portion 2 has an inner diameter that is gradually increased from the bottom surface toward the opening side. The opening angle β between the inner peripheral walls on both sides of the diameter is the irradiation angle of the laser beam. Equal to or greater than α (for example, 23
°), the size of the opening of the recess 2 is made as small as possible. And in this embodiment, as shown in FIG.
The bottom surface is made rough surface 2a by knurling or embossing to reduce the reflection of the laser beam on the bottom surface of the recess 2 so that energy can be absorbed easily . Thus , if the bottom surface of the recess 2 is a rough surface 2a, the reflection of the laser beam on the bottom surface is suppressed, so that the energy of the laser beam is absorbed well and welding can be performed more easily. Become . According to the first aspect of the present invention, there is provided a laser welding method for irradiating a welding member with a laser beam and welding the welding member to a member to be welded . Has an inclination equal to or greater than the irradiation angle and
Tapered from the bottom side to the opening side on the inner peripheral wall
There a recess of the rough surface, since the irradiating laser beam to the bottom surface of the recess of this, it can be irradiated portion of the laser beam and thin by the recess, if it were a thin plate when welding the members of the plank There is an effect that it can be easily welded. Or recesses to be able to minimize, and recesses
Because it can suppress the reflection of the laser beam on the bottom
Welding can be made easier. [0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a perspective view to partially cutaway omission of welding portion between the welding member and the member to be welded. (B) is sectional drawing of the welding site | part of the welding member same as the above and a to-be-welded member. 2 is a perspective view to partially cutaway omission of welding portion between the welding member and the welded members Ru used in embodiments of the present invention. [Explanation of Symbols] 1A Terminal 1B Terminal 2 Concave α Irradiation angle β Opening angle

──────────────────────────────────────────────────── ----- Continuation of front page (51) Int.Cl. ⁷ Identification symbol FI B23K 101: 38 B23K 101: 38 (56) Reference JP-A 63-130290 (JP, A) JP-A 6-310248 (JP) A) JP 7-99278 (JP, A) JP 6-246477 (JP, A) JP 61-20688 (JP, A) Toshiyuki Miyazaki 3 others, Laser processing technology, Japan, Sangyo Library Co., Ltd., May 31, 1991, first edition, P116-117 (58) Fields surveyed (Int.Cl. ⁷ , DB name) B23K 26/00-26/42 H01R 4/02 H01R 43/02

Claims (1)

(57) [Claims] [Claim 1] In a laser welding method of irradiating a welding member with a laser beam and welding the welding member to a member to be welded,
The laser beam irradiation angle at the laser beam irradiation site of the welded member
With an inclination equal to or greater than the degree and wide from the bottom side to the opening side
A taper is provided on the inner peripheral wall to form a concave portion with a rough bottom surface ,
Laser welding method characterized by irradiating a laser beam to the bottom surface of the recess.