| 摘要 |
PURPOSE: To determine perfectness of a fillet weld by measuring an intensity of a reflecting light from a brazed surface, obtaining a shape related to a height of the fillet weld of a brazed joint and comparing the profile with a predetermined reference. CONSTITUTION: A middle area 16e is smaller in height than the other fillet weld parts and therefore an inferiorly brazed part. Generally, when not smaller than half a side face of a lead wire 14 is exposed, the lead wire 14 is judged as brazed imperfectly. Therefore, if a shape of a brazed joint in a heightwise direction is determined along a line in touch with the lead wire 14, and compared with a predetermined standard with the use of an approximate expression, a ratio of the exposed lead wire 14 can be calculated. These operations are carried out automatically, so that defects of numerous brazed joints can be inspected at high speed with high reliability. |
