It has been widely studied about the final residual stress and deformation in muhipass welding of thick weldments. But there is a lack of a clear understanding of the interrelationship of interpass stress and deformat...It has been widely studied about the final residual stress and deformation in muhipass welding of thick weldments. But there is a lack of a clear understanding of the interrelationship of interpass stress and deformation during multipass welding. In this study, a three dimension numerical model of a sixteen-pass double V-groove welded joint with 50 mm plate is developed to compute the stress field and deformation by using multiple CPU parallel processing technology. The following factors such as the non-linear of temperature, heat radiation, filling of material step by step and so on are considered. Distribution and evolution law of welding stress in the transverse and longitudinal section is analyzed in this paper, and the interpnss stresses are studied also. At the same time the evolution course of angular deformation amount is analyzed, and the experimental results show that the calculated resuhs accord with the measured results of angular deformation.展开更多
基金National Natural Science Foundation of China (No. 50775053, 50675046)
文摘It has been widely studied about the final residual stress and deformation in muhipass welding of thick weldments. But there is a lack of a clear understanding of the interrelationship of interpass stress and deformation during multipass welding. In this study, a three dimension numerical model of a sixteen-pass double V-groove welded joint with 50 mm plate is developed to compute the stress field and deformation by using multiple CPU parallel processing technology. The following factors such as the non-linear of temperature, heat radiation, filling of material step by step and so on are considered. Distribution and evolution law of welding stress in the transverse and longitudinal section is analyzed in this paper, and the interpnss stresses are studied also. At the same time the evolution course of angular deformation amount is analyzed, and the experimental results show that the calculated resuhs accord with the measured results of angular deformation.
文摘通过富氩气体保护焊方法,采用准1.2 mm的MK.GHS80焊丝对30 mm厚煤机支架用Q690钢板进行接焊,分别研究了线能量、层间温度和焊后热处理温度对接头强度和冲击韧性的影响。结果表明,随着线能量增加,焊缝的抗拉强度和屈服强度均降低,当线能量超过2.244 k J/cm时,焊缝抗拉强度低于母材;焊缝和HAZ冲击性能均降低。随着层间温度的升高,焊缝的抗拉强度和屈服强度降低;焊缝和HAZ冲击性显著降低。随着焊后热处理温度的升高,焊缝的抗拉强度和屈服强度升高,其中温度对屈服强度影响较大;焊缝和HAZ冲击性能降低,当温度达到350°C以上时HAZ的冲击性能迅速恶化。
