... leaf springs, fork, valve, rocker, ball stud and other auto parts quenching. 3. All kinds of ... kinds of pliers, knives, scissors, axes, hammers and other hand tools quenchingDiathermy categories1. All kinds of bolt ... drill head, drill pipe, coal drill bits, drill bits and other mine parts of the wind welding Main ... , over voltage, over current, water shortage, and lack of any of the items above will ...