co_2c2_激光焊接高强度镀锌钢热循环理论与试验分析

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1、CO2激光焊接高强度镀锌钢热循环理论及试验研究图4.9不同线能量输入对热循环参数的影响······················································40图4.10高强钢激光焊接接头硬度分布曲线·························································43图4.11拉伸试样图···············································································

2、···············44图4.12焊接接头微观组织图···············································································45图4.13不同热循环条件下焊缝和热影响区尺寸··················································45图4.14高强钢激光焊接接头组织·································································

3、·······46图4.15激光焊接接头的拉伸试样断口形貌·························································47图5.1热影响区特征晶粒选取示意图·································································53图5.2热影响区晶粒尺寸图················································································54

4、图5.3热影响区不同部位晶粒尺寸变化曲线图···················································56图5.4热影响区最大晶粒尺寸随线能量的变化关系曲线图································57IX硕士学位论文附表索引表2.1激光焊接输入能量与能量分配比······························································18表3.1高强度镀锌钢(DOGAL800DP)材料的化学成分··········

5、·····························20表3.2试验材料的机械性能················································································20表3.3激光参数···································································································22表3.4LCK-12×25数控精密激光加工机的主要参数·····

6、····································23表3.5常用热电偶特性表····················································································26表3.6铂铑10-铂热电偶分度表············································································27表4.1焊接热循环计算结果与实际检测结果对比···············

7、································35表4.2焊缝宽度随深度方向的变化·····································································37表4.3Tm=1500℃不同工艺下的t8/5····································································38表4.4不同工艺参数下高强钢镀锌层烧蚀宽度理论计算·····························

8、·······39表4.5不同激光功率和速度对热循环参数的影响(测量点距焊缝中心1.0mm)···40表4.6不同流量辅助气体下激光焊接热循环参数···············································41表4.7高强度镀锌