Abstract
Laser welding process of aluminum alloys are recognized as an important producting system increasingly recently in automobile and electronics industries. However, even if the alloy is welded in the proper welding condition, depending on an alloy, weld defects, such as a solidification crack and porosity, occur, and it has been a problem. In the present work, the Fan-shaped solidification crack test method was investigated to evaluate the crack susceptibility of the alloy and to solve the problem. The solidification crack, which occurs in bead-on-plate, welding at an angle to the edge of the specimen, and spread in various aluminum alloy welds from the start of bead evaluation of solidification crack susceptibility was tried by measuring the crack length. Moreover, the same experiment was conducted using the adaptive mirror, which the focal point is changed by 0 to 1000 Hz in the beam direction. By oscillating the focal point of laser beam, weld pool and keyhole were stabilized and it result in reducing solidification crack susceptibility.
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