Based on the principle of electrochemistry, brown gas generator (oxyhydrogen generator), a special equipment, decomposes water into a mixture of hydrogen and oxygen. After the gas is ignited by a special welding gun, it can braze copper tubes of different sizes and shapes. This brazing scheme can effectively improve the welding efficiency, improve the welding quality, reduce the welding cost and eliminate the emission of harmful gases, It can completely replace the existing acetylene, propane and other gases (64% less than acetylene, 32% less than propane), and has been widely used in the refrigeration industry.