N_2-Ar混合气体保护钨极氩弧焊接10mm紫铜厚板工艺  

N_2-Ar gas tungsten arc welding of 10 mm copper plates

作　　者：李一楠[1] 

机构地区：[1]青岛理工大学机械工程学院,山东青岛266000

出　　处：《电焊机》2013年第9期63-68,共6页Electric Welding Machine

基　　金：国家自然科学基金资助项目(52105218);国家博士后基金资助项目(2013M531562);青岛理工大学优秀研究团队资助项目

摘　　要：对比了10 mm厚紫铜板N2-Ar混合弧和Ar弧焊时的温度场和应力场,结果表明N2-Ar混合弧热输入效果相当于Ar弧预热400℃的效果,即采用N2-Ar混合弧可实现10 mm紫铜厚板的不预热焊接。针对N2-Ar混合弧焊后焊缝中存在氮气孔的问题,提出在焊材中添加脱氮元素Ti的方法,即采用HS201+Ti6Al4V复合焊丝进行焊接。使Ti与熔池中的N生成高熔点低密度TiN,TiN最终以焊渣形成排出熔池,达到抑制氮气孔的效果。最终力学测试结果表明,当焊缝中的氮气孔完全被抑制和(TiN+Cux Tiy)第二相以点状弥散分布时,焊缝金属的力学性能最好。The numerical simulations of temperature and stress fields of 10 mm copper plates by using N2-Ar and Ar shielding arc welding were carried out.And it can be found that the N2-Ar GTA welding of copper plates without preheating can be carried out successfully to replace Ar GTA welding.Aim to eliminate the nitrogen porosities,the element Ti in form of HS201 ＋Ti6Al4V composite wire selected as denitrifier and combined with N to form TiN.And finally TiN excreted the welding pool and formed as weld slag.The mechanical performance results show that,the tensile strength and impact ductility achieve the good effect when the nitrogen porosities were eliminated completely and the second phases composed of TiN＋CuxTiy were distributed dispersedly.While the tensile strength and impact ductility would be decrease as the second phases were segregated and distributed continuously.

关 键 词：紫铜厚板 N2-Ar混合弧焊 氮气孔 HS201＋Ti6Al4V复合焊丝 

分 类 号：TG444.74[金属学及工艺—焊接]