The machine is designed with advanced technical concept. It is used for flame automatic brazing of aluminum joint parts of automobile pipeline, and can also be used for welding of other materials. Liquefied gas (propane) or natural gas is used as combustible burning gas, and the air is inhaled in the way of natural suction to mix into combustible gas or mixed by forced fan. After ignition, aluminum and other parts are brazed. The flame is soft, the welding quality is high, and the brazing time can be accurately controlled. The machine is composed of three stations. The left and right stations are the welding position, the middle is the stay position, and the stay position is in the low fire state, saving energy.