基于原位测量的钨极惰性气体保护焊焊接过程高温应变表征与计算

Characterization and Calculation of High Temperature Strain in Gas Tungsten Arc Welding Based on in Situ Measurement

采用数字图像相关(DIC)方法与有限元法相结合模拟钨极惰性气体保护焊(GTAW)焊接过程高温应变的演化规律.利用DIC方法获得整个焊缝热影响区的高温应变,并用ABAQUS软件模拟计算GTAW焊接过程的温度场和应变场,将计算结果与DIC方法所得高温应变进行对比.同时,通过原位测量焊缝热影响区的高温应变,验证了DIC方法表征焊接过程高温应变的可行性以及有限元法模拟结果的合理性.

The digital image correlation （DIC） method was combined with finite element simulation to describe the high temperature strain evolution of gas tungsten arc welding （GTAW）. The DIC method was adopted to get the strain evolution at a high temperature heat affected zone. Then, the finite element modeling method of the ABAQUS software was used to simulate the temperature and strain fields of heat affected zone （HAZ）. The results were compared with the results of the DIC measurement. By calculating HAZ strain measurement, the feasibility of the DIC method in describing high temperature strain and the rationality of the finite element model were validated.