*Seam Welder for easily joining Hoop Work pieces into coil forms. *Seam welding is used for joining the end part and the top part of the coiled material. *It is possible to weld various materials (i.e. general materials, aluminum, stainless steel, coated steel plate, titanium, copper alloy, etc.) of more than 0.5mm thickness. *The length of the joint materials can be about 10mm and over. *The seam welder in this video can weld the joint workpieces of up to 100mm wide. *ARO-France-make AC transformer and constant-current timer are used.