Nimonic263合金薄板激光焊热源模型及参数研究

Investigation of Heat Source Model and Its Parameters Used in Laser Welding of Nimonic263 Alloy Thin Plate

热源模型及参数选取是激光焊接热过程模拟的关键。采用MSC.Marc软件,基于高斯面-圆柱体组合热源模型研究了热源功率分配比、模型参数对Nimonic263合金薄板激光焊熔池尺寸和温度场的影响,并结合焊接实验结果确定了最佳热源功率分配比和模型参数。结果表明:熔池上宽随面-体热源功率分配比增大而增大,随面热源半径增大而减小,熔池下宽随体热源半径增大而减小;熔深随面-体热源功率分配比增大而减小,当体热源深度大于板厚时,熔池均贯穿板厚;最高温度和热影响区范围均随面-体热源功率分配比的增加先增加后减小。当面-体热源功率分配比为3:7时,所得熔池尺寸与实际焊缝尺寸吻合良好,其结果优于面-双椭球体组合热源模型的计算结果。

Selecting heat source model and its parameters is the key to simulation of laser welding process.Based on gauss surface-cylindrical body hybrid heat source model,the effect of the power distribution ratio and model parameters on the weld pool size and temperature field of laser welding of Nimonic263 thin-plate metal was investigated by MSC.Marc software,and then the optimal power distribution ratio and model parameters were determined according to laser welding test results.The results show that the upper section width of weld pool increases with increase of the power distribution ratio of surface-body hybrid heat source,but decreases with increase of the radius of surface heat source.The lower section width of weld pool decreases with increase of the radius of body heat source.The depth of weld pool decreases with increase of power distribution ratio of surface-body hybrid heat source,when the depth of the body heat source is greater than the plate thickness,the molten pool runs through the plate.Both the highest temperature and heat affected zone size first increase and then decrease with increase of power distribution ratio of surface-body hybrid heat source.When the power distribution ratio of surface-body hybrid heat source is 3:7,the size of simulated weld pool is close to that of actual laser weld pool.The results of gauss surface-cylindrical body hybrid heat source are superior to that of gauss surface-double ellipsoidal body hybrid heat source.