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Multi-pass tandem gas metal arc welding (TGMAW) for A1 5083 alloy plates with 30mm thickness is carried out to study its high efficiency and high quality.The welding process is evaluated by high-speed photographs and electrical signals.The deposition rate and welding time are calculated to characterize the welding efficiency.The bead formation,porosity,microstructure and mechanical properties are tested and analyzed.The results indicate that though arc deflection occurs due to the electromagnetic interference between two arcs during TGMAW process,it does not affect the welding process stability significantly.The deposition rate and welding time of TGMAW process are about 15 g/min larger and about 16.7％ less than those of gas metal arc welding (GMAW) process respectively,accompanied by the reduction of heat input.The TGMAW welded joint has less porosity and more refined microstructure to contribute to the improvement of mechanical properties (micro-hardness,tensile strength and ductility).It can be concluded that TGMAW process yields excellent performance of welded joint with improved welding efficiency,which makes it extremely practical during welding of thick plates.