AUTOMATIC RESISTANCE SEAM WELDING MACHINE BY DC INVERT FOR INVAR STEEL WELDING AT THE LNG CARRIER

摘要

Disclosed is an automatic resistance seam welding machine used for welding of a membrane attached inside a cargo tank of an LNG carrier according to the present invention. The automatic resistance seam welding machine for INVAR steel welding at the LNG carrier can improve welding quality as well as work efficiency and productivity by using an inverted direct current power supply instead of a single phase alternating current power supply and providing optimal welding conditions to a thin plate connecting portion of the membrane.