Abstract
In order to reduce productioncost, it is necessary to reduce the quantity of shielding gas under ensuring the quality of welding jointsin gas metal arc welding (GMAW) process. Three nozzles,spiral nozzle, shrink nozzle and diverging nozzle, with different geometric structurewere designed to compare with industrial normal nozzle. The influence of the shielding gasdosageson the protectionradiusforfour types of nozzles were analysed through computational fluid dynamics (CFD) simulation, and the minimum dosage of shielding gas for different nozzles were obtained. The GMAW experiments were conducted with Q235 steel through the minimumdosage of mixture gas with four kinds of nozzles. After tensile tests of four kinds of standard welding samples, the fracture did not occur at the welding seam. So the shielding gas dosageintraditional GMAW process could be reduced greatly.
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