Numerical Analysis of the Coupled Arc-weld Pool Behaviors in GMAW Buried-arc Welding
GMAW buried-arc welding is an efficient welding method of GMAW in large current range with high speed wire feed to achieve high deposition rate and low spatter rate.It can realize effective welding of medium and thick plates,and significantly improve the welding efficiency.A mathematical model of arc-pool coupling for fine wire GMAW buried-arc welding is established,so as to study the arc-weld pool coupling mechanism.The effects of during droplet transition and metal vapor are especially considered.Numerical simulation results show that the welding process of fine wire GMAW buried-arc welding under pure CO2 shielding gas,the arc can be stably buried into the weld pool.The arc shape of GMAW buried-arc welding is different from the bell shape of ordinary GMAW,after the arc enters the cavity,it digs down while expanding,and lead to the cavity depth to increase significantly.In GMAW buried-arc welding,the dynamic evolution of arc-molten pool caused by thermal-mechanical coupling is the fundamental cause of large penetration depth,the establishment of this model lays a theoretical foundation for the application of GMAW buried-arc welding.
GMAW buried-arc weldingnumerical simulationarc-molten pool coupling behavior
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