HWASHI WL-UM-160 Stainless Steel Sink Seam Welding Machine Undermount sinks weld on a rim that sits under the counter, so the head has to reach a joint that is not flat. The WL-UM-160 uses an angled head and a dedicated rim fixture to keep electrode force on that joint through the whole seam. Key Features Angled welding head: Reaches the bowl rim joint that standard flat bed welders cannot access. Dedicated rim fixture: Fixture locates the rim flange, keeping the seam line at