Speaker
Description
The high heat input welding method can improve the efficiency of manufacturing, but the impact toughness of the heat-affected zone (HAZ) is reduced seriously during the welding process. Thermal profile evolution in HAZ is the key factor affect microstructures and resulting mechanical properties of welded joints.
In this study, we coupled heat transfer, solid mechanics and solid-state evolution to simulate the electro-gas welding (EGW) process of ultra-high-strength marine steel plate using COMSOL multiphysics software. The real welding geometry, process variables and materials are used with a three-dimension heat source as a sinusoidal function with various heat inputs up to 200kJ/cm. The simulation results reveal that microstructure can be optimized by varying the welding source movement path and the cooling rate of sliding copper shoe, to improve the properties of HAZ.