- Circular seam welder for tank and pipe - TIG, MAG, MIG, plasma, laser avaiable - 1 ... , pressure container, gas tank and so on. Work piece is rotated by motor and belt. Welding torch's horizental ... sources. Such as TIG welder, MIG/MAG welder, plasma welder, laser welder and so on. Water cooling for torch and cooper plate is optional. ... support.Picture 5. Cooper earth connection. Circular seam welder