The set of welding lines for the production of microwave ovens of the special welding equipment. Welding lines are welding the entire roof and U-shaped plate; front board long, short side; back board long and short side; motor stent; waveguide box; waveguide assembly; The welding voltage is constant, the welding quality is stable, the design has the special positioning device, the welding efficiency is high, the surface of the work piece has no obvious damage, is the microwave oven manufacturer ideal welding equipment.