serving by liquid ammonia, ammonia decomposition furnace gas generation device thermal decompose with the effect of catalyst to produce strong reducing protective gas with 75% of hydrogen and 25% of nitrogen, which are widely applied in the industries of metal bright heat treatment, powder metallurgy agglomeration, metallic material gas shielded welding, bright demagnetization of magnetic material, electronics, ceramics, brazing and soldering of various precise components, etc.