PURPOSE: To decrease the fraction defective of a product by making the time between each real welding of laser welding approximately the same as the time from waste welding to real welding.
CONSTITUTION: A wire assembly 24 and a spring 21 are set to a welding jig 14. A metallic plate 16 for waste welding is attached to the jig 14. The plate 16 is subjected to several times of waste welding and thereafter an X-Y table is moved to the prescribed extent and laser light is irradiated to the weld zone of the #1 spring to execute welding. The X-Y table is further moved to the prescribed extent and the welding of the 2nd weld zone of the #1 spring is executed. The moving time from the waste welding to the real welding and the real welding time are set approximately the same time. The #2W#8 springs are subjected to the similar welding. The welding is stabilized by the method of such time distribution and the fraction defective of the product is decreased.
UEMATSU SHIGERU
SAITO AKIKO
