... spot weld the different types of steel such as double-layer and multi-layer high strength steel.2.Double acting C-gun ... monitoring,open-phase protection for input voltage.4.Multi-pulsed spot weld function5.Over-heat protection with precision.6.Single- ... welding procedures are available such as shrinking,washer,direct-pulling,spot welding,flattening,waveform wire,stud welding,OT wsher,triangle washer ...