公开(公告)号：EP0788418A4

公开(公告)日：1998-01-28

申请号：EP95940595

申请日：1995-10-18

Applicant: EMHART INC

Inventor： CUMMINGS GERALD FLOYD ,  MAUER DIETER

IPC: B23K9/20

CPC classification number: B23K9/205 ,  B23K9/20 ,  B23K9/201

Abstract: Stud welding device with an axially displaceable adjusting element (3, 17) for displacement from a front position into a rear position and back, in which a magnetic field and a coil (15) interact in such a way that, when the coil (15) is connected to a controllable current source (41) an axial force is produced in order to displace the adjusting element (3, 17), the movement of which is transmitted to a stud holder (2), characterized in that the coil (15) is rigidly arranged on a hollow body (14) which is connected to the adjusting element (3, 17) and is arranged axially movably in an air gap (13) between a magnetizable core (8) and a magnetizable sheath (10), the magnetic field being conveyed via at least one yoke (9) connecting the core (8) and the sheath (10) while passing radially through the coil (15), the coil exerting on the adjusting element (3, 17) an axial force acting only in one direction as a function of the direction of current during current control.