镁合金AZ31B钨极氩弧焊焊接过程热效率研究  

TIG Welding Heat Efficiency for AZ31B Magnesium Alloy

作　　者：初雅杰[1,2] 陈坚[1] 李晓泉[2] 吴申庆[1] 杨宗辉[2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]南京工程学院材料工程学院,南京211167

出　　处：《材料工程》2012年第12期29-32,38,共5页Journal of Materials Engineering

基　　金：江苏省自然科学基金资助项目(BK2009354);南京工程学院科研基金资助项目(QKJA2010002);大学生科技创新基金资助项目(N20120205)

摘　　要：以镁合金AZ31B为研究对象,采用钨极氩弧焊(TIG)填丝工艺,研究在不同焊接工艺参数下(I=120～200A,U=11～15V,v=3～11mm/s)的焊接电弧热效率和熔化效率,并探讨焊接工艺参数、焊接热效率和熔化效率对焊接接头微观组织的影响。结果表明:焊接工艺条件下,镁合金AZ31B的焊接电弧热效率值在0.56～0.82之间;熔化效率随着焊接电流和焊接速率的增加而增大;不同的焊接工艺对焊接接头的横截面形状(熔深B和熔宽H)和微观组织都有较大的影响。The AZ31B magnesium alloy welded joint were carried out on tungsten inert gas（TIG） welding with filler, and arc heat efficiency and melting efficiency were studied in terms of process pa- rameters （welding current in the range of 120-200A, welding voltage in the range of 11-15V and weld- ing speed in the range of 3-11mm/s）, and the effects of welding process parameters, arc heat efficien- cy and melting efficiency on the microstructure of welding joint were analyzed. The results showed that the arc efficiency values ranged from 0.56-0.82 in terms of welding process parameters. Melting efficiency increased with both increasing welding current and speed. The analyses revealed a strong influence of the TIG welding process on cross-section shape of the fusion zone （the depth B and width H） and also on the microstructure of the welding zone.

关 键 词：AZ31B镁合金 电弧热效率 熔化效率 

分 类 号：TG146.2[一般工业技术—材料科学与工程]