HWASHI WL-TB-250 Stainless Steel Sink Seam Welding Machine Triple bowl sinks triple the seam length of a single bowl. The WL-TB-250 uses three position indexing so each bowl is presented to the head in turn while the operator stays at one loading point. Key Features Three position indexing: Each bowl seam is presented automatically, one operator loads and unloads at a single station. 250kVA power supply: Sustains current on long total seam length without duty cycle derating.