Numerical simulation on temperature field of three wire submerged arc welding of 30 mm EH420 ship plate steel
In order to minimize the effect of the high temperatures generated during welding on the toughness of the heat-affected zone,the effects of welding line energy,wire power distribution,welding voltage and wire spacing on the temperature field were investigated separately.Based on Visual-Environment finite-element software,numerical simulation of the temperature field of three wire submerged arc welding of 30 mm EH420 shipboard steel was carried out by utilizing the double-ellipsoid heat source model.The results show that:1)When the welding energy definition decreases from 150.26 kJ/cm to 104.72 kJ/cm,the peak temperature in the coarse crystal area decreases by 322 ℃.2)At the same welding energy definition,the peak temperature in the coarse crystal area decreases by 56.79℃when the power share of the first welding wire increases from 25.00%to 41.67%and the power share of the middle welding wire remains unchanged.3)Increasing the welding voltage results in less variation in peak temperature,depth and width in the coarse crystal area.4)The wire spacing increases from 20 to 45 mm,the length of the melt pool increases by 50 mm,and there is a transition from single melt pool to double melt pool after the wire spacing of 40 mm.The peak temperature of the coarse crystal area shows the trend of increasing and then decreasing,and the wire spacing of 35 mm reaches a maximum temperature of 1 183.62℃.5)From the fitting results,in welding 30 mm EH420 ship plate steel"Y"type interface,the welding energy should be 174.54 kJ/cm.In this welding energy the power ratio of the front,middle and rear wires should be 15∶11∶7,and the wire spacing should be 20～30 mm,which can effectively avoid the welding defects.The research results can not only ensure the welding quality,but also significantly improve the welding efficiency,providing a new method for the enterprise to reduce costs and increase efficiency.
welding process and equipmentsubmerged arc weldingnumerical simulationstemperature fieldship plate steel
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