快速凝固耐热铝合金AA8009Nd:YAG激光焊接  

Nd:YAG laser welding of rapid-solidfied heat-resistant aluminum alloy AA8009

作　　者：丁荣辉[1] 黎文献[1] 王日初[1] 余琨[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《焊接学报》2007年第9期33-38,共6页Transactions of The China Welding Institution

基　　金：国家重点基础研究发展规划资助项目资助(G1999064912)

摘　　要：快速凝固耐热铝合金AA8009的焊接技术是该合金实用化过程中必须解决的关键问题之一。试验采用不同工艺参数对1 mm厚AA8009板材进行了对接焊。结果表明,随着焊接速度增加,焊接热输入量减少,焊缝冷却速度增加,焊缝组织得到改善,由平衡态向非平衡态组织转变,焊接接头抗拉强度和显微硬度增加。当焊接热输入量为8.15 J/mm,焊缝抗拉强度达到379.9 MPa,焊接系数达到95%,断裂发生在熔化区边界。Welding of rapid-solidfied heat-resistant aluminum alloy AA8009 is very important to its application.Different welding parameter were used in the Nd:YAG laser butt welding of 1mm thick AA8009 plate.The results show that,with the welding speed increase,and the total energy input decreases,and the cooling rate within the weld increases,and the weld microstructure are improved and changed from equilibrum state to non-equilibrum state microstructure.When the energy input is 8.15 J/mm,the tensile strength reaches 379.9 MPa,that the weld coeffcient reached to 95% and the fracture happens at the boundary fusion zone.

关 键 词：快速凝固 耐热铝合金 激光焊接 

分 类 号：TG453[金属学及工艺—焊接]