METHOD FOR QUALITY JUDGEMENT OF WELDED PRODUCT BY FRICTIONAL WELDING AND ITS APPARATUS

摘要

PURPOSE:To judge the quality of welded portions during the course of welding process without any inspection process, by measuring the maximum stopping acceleration at the time of frictional movement stopping in the process of frictional welding. CONSTITUTION:The stopping acceleration of frictional movement becomes the main factor of occurrences of inferior welded products. Because of this, for example, a rotary shaft 4 of a frictional welding machine is connected to a mass body 41 with a flexible part 42, and a strain gage 43 is sticked on the flexible part 42. In this way, the stopping acceleration can be obtained, because, when the rotary shaft 4 stops, the movement of the mass body 41 is delayed due to the acceleration, the part 42 is bent, and the degree of bending is proportional to the strength of the stopping acceleration. When this value is smaller than a previously set value, the product is judged as inferior.