...50mminwidthand4mminthickness.Thechemicalcompositionofthese...

来自 : 作业帮 发布时间：2021-03-24

Materials used were F82H and SUS316Lplates whose size was100 mmin length,50 mmin width and4 mmin thickness.The chemical composition of these materials is shown in Table 1.The steel was normalized at 1040 C for 0.5 h and tempered at740 C for 1.5 h before the welding.采用F82H和SUS316L的材质盘,尺寸为：100毫米长、50毫米宽、4毫米厚.这些材料的化学成分见表一.焊接之前,F82H钢是在1040摄氏度的加热半个小时,在740摄氏度中经过一个半小时的煅就.According to our previous study for examining the weldability ofF82H/SUS316Ljoint welded by the fiber laser,the position of laser beam was varied from the contact face to SUS316Lside,where the shift was set as smaller than0.2 mmsince the diameter of laser beam was only0.2 mm[7].Also,the welding speed was varied in order to examine the effect of heat input on the mechanical properties.Then,the welding conditions were summarized in Table 2.Since,in the practical manufacturing process with fiber laser,a special jig tool is occasionally employed to control laser beam position precisely,an original jig tool was used in this experiment,where the laser beam position can be shifted with micrometer order.There were various reports about the necessity of post-weld heat treatment (PWHT) to the welded F82H joint [2,11] and the EB welded joint between F82H and SUS316Lfor improving their mechanical properties [5].So,PWHT was performed at 720 C for 1 h according to the previous studies根据我们先前的对F82H/SUS316L采用纤维激光器缝焊性的研究,激光束在触碰到SUS316L表面时不同,移动设置在0.2毫米,因为激光束的直径仅为0.2毫米.还有,焊接的速度也要根据不同机械性质的热效率而变化.焊接的条件归总在表二里面.在使用纤维激光器实际生产过程中,应使用专用夹具,以便控制激光束的精准位置,实验中,采用了原始夹具,使得激光束以千分米的命令移动.为提高其机械性能的F82H接缝【2.1】以及F82H与 SUS316L中间的电子束焊接缝的焊后热处理之必要性的报告也有所不同.根据先前的研究,焊后热处理应在720摄氏度处理一个小时.