Spot welding is reliant on the ability to conduct high voltages at precise levels with the correct application of pressure and time. This kind of high precision work requires well-maintained tools. Maintaining clean weld caps (tips) is a critical part of quality welding. If you do not maintain clean weld caps you lose weld strength and performance. The Tip Sharpener (Tip Dresser) keeps your weld caps clear of rust and residue that build up over time from exposure and repeated use. The Tip Sharpener also maintains the size of the weld cap for optimal weld success. Get 50% more use out of your tips using the Tip Sharpener.