公开(公告)号：US3604888A

公开(公告)日：1971-09-14

申请号：US3604888D

申请日：1970-02-26

Applicant: HUGHES AIRCRAFT CO

Inventor： FRIESS RICHARD G ,  HOUGEN TOR

IPC: B23K11/26

CPC classification number: B23K11/26

Abstract: A charged capacitor is connected in series with a pulse welder transformer primary and a switching SCR. The weld control circuit is connected to fire the SCR, when the weld pulse is required. A transistor connected across the SCR shunts the SCR to positively reduce the SCR current below its holding current value. The SCR current is measured so that the transistor is not turned on until the current is at a safe value.