The welding quality or parameters were interfered by the gas flow in aluminum MIG welding.The welding current and voltage under different gas flow states were collected with a welding parameter collecting and detection system.The effect of electrical signals and gas flow volume on the welding parameters were analyzed by special method.The results show that the system can qualitatively detect the adequate states of gas flow in welding protective area.The stability of welding-arc can be directly reflected in ...