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采用ABAQUS有限元分析软件对氢在不均质焊接接头的扩散进行了模拟计算 ,结果表明 ,对 2 0MnNiMo钢焊接接头 ,随时间延续 ,焊缝金属中的氢浓度逐渐降低 ,而熔合区以外区域氢的浓度经历了一个峰值变化过程。由于焊接接头不同部位氢的扩散系数和溶解度不同 ,一定时间以后热影响区中的氢浓度超过焊缝金属和母材 ;预热使焊缝金属中的氢浓度快速降低 ,并缩短热影响区出现峰值浓度的时间 ;后热可加速氢从焊接接头的逸出 ,降低热影响区氢浓度峰值并缩短其出现时间。
The ABAQUS finite element analysis software was used to simulate hydrogen diffusion in inhomogeneous welding joints. The results show that the hydrogen concentration in the weld metal gradually decreases with the passage of time for 20MnNiMo steel welded joints, while the area outside the fusion zone The concentration of hydrogen undergoes a peak change. The hydrogen concentration in the HAZ exceeds that of the weld metal and the base metal after a certain period of time due to the difference of diffusion coefficient and solubility of hydrogen in different parts of the welded joint; preheating rapidly reduces the hydrogen concentration in the weld metal and shortens the occurrence of heat-affected zone Peak concentration of the time; after the heat can accelerate the escape of hydrogen from the welded joints, reducing the heat-affected zone hydrogen concentration peak and shorten the appearance of time.