1,material SS cold-rolled sheet ,thickness 0.53-2.5m 2,Seam width no more than 3mm 3,Welding speed no ... ,Welding material SS cold-rolled sheet ,thickness 0.53-2.5m 2,Seam width no more than 3mm 3,Welding speed no ... KINDS OF EQUIPMENT FOR INNER TANK AND OUTER TANK OF SOLAR WATER HEATER ACCORDING TO CUSTOMER’S REQUIREMENT AND NEED. straight seam welding ...