... 53-2.5m 2,Seam width no more than 3mm 3,Welding speed no less than 1000mm/min 1,Welding ... 53-2.5m 2,Seam width no more than 3mm 3,Welding speed no less than 1000mm/min 4,Welding ... Arc Length no more than 5mm 5, ... INNER TANK AND OUTER TANK OF SOLAR WATER HEATER ACCORDING TO CUSTOMER’S REQUIREMENT AND NEED. straight seam welding machine for inner ...