Abstract
There are two parts of the heat input in gas-metal arc welding (GMAW): one isthe arc heat flux and the other is the heat content of filler metal droplets.This paper introduces a new mode of arc heat flux density distribution on thedeformed GMAW weldpool surface. A numerical model of fluid flow and temperaturefield in GMAW is established according to the new mode of arc heat fluxdistribution. By using a numerical simulation technique, the effects of weldingheat input on microstructure and hardness in HAZ of HQ130 steel are studied. Thedimensions of Austenitic grains and hardness in different locations in HAZ ofHQ130 steel are calculated under different welding heat inputs. Experiments showthat the calculated results of welding thermal cycle and microstructure andhardness in HAZ of HQ130 steel are in agreement with measured ones.
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