MANUFACTURE OF CONTACT OF P MEASURING APPARATUS

PURPOSE: To obtain a contact utilizable for longer life by a method wherein the tip of a base body is brought into contact with a ball body formed separately to weld with the energization of a contact part of both bodies so that the part contacting an object to be measured is made hard to wear. CONSTITUTION: A ball body 20 is mounted on a base body 19 in such a manner that an external surface part 25b, an internal surface part 25c and a front part 25d out of the outer circumferential surface 25 of the ball body 20 are exposed continuously from the base body 19. In its manufacture, firstly a protruded part 86 is formed to concentrate current on the center part of the tip 19a of the base body 19 in welding. On the other hand, the ball body 20 is prepared which is formed separately from the base body 19. The base body 19 and the ball body 20 are held so as to axially align and then, the tip 19a of the base body 19 is brought in contact with the ball body 19. Under such a holding condition, the contact part 95 between the base body 19 and the ball body 20 is energized from an energization circuit 90 for welding to weld at a connection part of the both.