Heat upsetting of high-strength bolts and nuts, heat treatment of gears, sprockets, crankshafts, spline shafts and other parts, valve welding, hot-rolled straight shank twist drills, mining drills, picks, machining tools, etc. welding. Hot penetration forming of large-size standard parts, fasteners, automobile and motorcycle parts, tools, gears, large steel pipes; various types of hardware tools, machine tool guide rails and other large workpieces, local fire and overall quenching; welding of large metal materials .