《Al_12_7Si_0_7Mg合金交流TIG焊接头组织与性能》.pdf

第32卷第10期 东 北 大 学 学 报 ( 自 然 科 学 版 ) Vol. 32, No. 10 201 1 年 10 月 Journal of Nort eastern U niversity( Natural Science) O ct. 2 0 1 1 Al- 127Si- 07Mg TIG 何长树, 王 东, 赵 刚, 左 良 ( , 110819) : ER4043 ER4047 Al- 12. 7Si- 0. 7Mg T IG . . : , TIG ; (WZ) , ( HAZ) Si ; , , . 90% . : Al- 127Si- 07Mg ; T IG ; ; ; : T G 457. 14 : A : 2011) Microstructure and Mechanical Properties of Al127Si07Mg Alloy Joints Welded byACTI Welding HE Changshu, WANG Dong, ZHA O Gang , ZUO Liang ( Key Laboratory of Anisotropy and Texture of Materials ( Ministry of Education ) , Nort eastern University, S enyang 110819, C ina. Corresponding aut or : HE C angs u, Email: c angs u e @ mail. neu. edu. cn) Abstract: Hot extruded Al12. 7Si0. 7Mg alloy plates w ere w elded by tungsten inert gas (T IG) w elding met od using imported ER4043 and ER4047 w elding w ire. T e microstructures and mec anical properties of w elded joints w ere studied by optical microscopy, micro ardness test and tensile test met ods. T e results s ow ed t at w eld beads are fairly good under t e c osen w elding parameters. T e w eld zone ( WZ ) is t e typical casting structure formed during weld solidification. Coarsening of silicon p ase w as observed in t e eataffected zone ( HAZ) . T e distribution of micro ardness of t e welded joints s ow s t at t e ardness gets maximum values in WZ, drops rapidly in fusion zone ( FZ) and reac es to minimum values at HAZ. T e tensile strengt of t e joints welded w it eit er ER4043 or ER4047 w elding w ire reac more t an 90% of t e base material. Key words: Al12. 7Si0. 7Mg alloy; AC TIG w elding; welded joint; microstructure; mec anical property [ 5