Patent ID: 6037556
Filing Date: 2000-03-14
Classification: B23K

Abstract:
In high frequency welding apparatus in which facing metal surfaces to be welded together are advanced along adjacent paths toward a weld point with a gap between the metal surfaces, the surfaces are heated to forge welding temperature prior to reaching the weld point by supplying high frequency electric current to the surfaces by way of a first contact having a contact face with a downstream edge contacting the metal at one side of said gap in advance of the weld point and adjacent one of said facing metal surfaces and by way of a second contact having a contact face with a downstream edge contacting the metal at the other side of said gap in advance of the weld point and adjacent the other of said facing metal surfaces and in which the facing metal surfaces are pressed together at the weld point to form a weld at the weld point, wherein the improvement comprises:the contact face of at least one of said first contact and said second contact has a downstream edge extending at an acute angle of about 35.degree. to about 55.degree. with respect to the path of said metal surface adjacent to said at least one contact, said angle being intermediate the contacts and said weld point.