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DC 223welder ECCENTRIC HELICAL is the Inverter DC 18650 Battery Bottom Shell Spot Welder Heads supply, suitable for automatic Battery Bottom Shell Spot Welding , Max. output current 2500A, welding speed over 260pcs/minute, battery nickel strips welding diameter from F0.02—0.12mm, firm welding and good welding surface. Our Inverter DC welder has special advantage: 1.Firm spot welding. Avoid “missing welding”.