HWASHI WL-UT-315 Stainless Steel Sink Seam Welding Machine Plants that make both sinks and water tanks usually buy two machines. The WL-UT-315 carries a 315kVA supply and a convertible bed so the same frame runs sink bowl seams and tank shell seams depending on the fixture set fitted. Key Features Convertible bed: Bowl fixture set and tank shell roller set fit the same bed, swap takes under an hour. 315kVA power supply: Covers both thin bowl material and heavier tank shell