Product Overview This CE certified high frequency resistance sink seam welding machine uses roller electrodes instead of cylindrical spot welding electrodes. The welded workpiece moves between the rollers to produce a sealed weld with overlapping molten cores, effectively joining the stainless steel sheets into an airtight sink bowl. Key Features High Frequency Resistance Welding: HFW technology concentrates heat exactly at the seam for fast, efficient and repeatable welds.