A seam welder is to form a welding seam,like  stainless steel composite pipe,or making a can  by putting a lid on a case in which an electronic component is placed for hermetic package,It is intended to shut off the outside air from the component inside the package for stable operation for a long period of time.
1,IGBT inverter with 4kHz frequency.
2,Perfect current waveform control systerm.
3,Exactly adapt the beginning,central and ending of the seam welding.
4,Display actual welding current. 
5,Fast response,0.*5ms once.