Microstructure and mechanical property of A7N01 aluminum alloy joints by fiber laser-variable polarity TIG hybrid welding with filler wire - Details

Author：

Qiao, Junnan (Qiao, Junnan.) | Wang, Qiming (Wang, Qiming.) | Zou, Jianglin (Zou, Jianglin.) | Wu, Shikai (Wu, Shikai.)

Indexed by：

EI Scopus PKU CSCD

Abstract：

By　the　hybrid　technique　of　fiber　laser　and　variable　polarity　tungsten　inert　gas,　A7N01　aluminum　alloy　is　welded　with　filler　wire.　After　optimizing　process　parameters,　joints　with　good　formation　and　without　defects　are　obtained.　The　microstructure,　tensile　and　fatigue　properties　of　these　joints　are　investigated,　and　the　fatigue-fracture　characteristic　and　fracture　morphology　are　examined.　The　research　results　indicate　that　these　joints　are　mainly　composed　of　fine-grained　zone,　columnar　grains,　and　equiaxed　dendrites.　The　average　tensile　strength　of　these　as-welded　joints　is　320　MPa,　around　75%　of　that　of　base　metals.　After　natural　aging　of　30　days,　the　average　tensile　strength　increases　to　369　MPa,　around　83%　of　that　of　base　metals.　Fractures　locate　at　the　stress　concentration　zone　of　the　weld　toe,　and　the　fracture　shows　an　obvious　dimple　shape,　which　is　the　unique　characteristic　of　ductile　fracture.　The　fatigue　limit　of　these　joints　is　115　MPa.　©　2016,　Chinese　Lasers　Press.　All　right　reserved.

Keyword：

Aluminum alloys Tensile strength Optical fiber fabrication Welds Textures Fillers Morphology Laser beam welding Ductile fracture Fatigue of materials Inert gases Microstructure Fiber lasers

Author Community：

[ 1 ] [Qiao, Junnan]Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Wang, Qiming]Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Zou, Jianglin]Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Wu, Shikai]Institute of Laser Engineering, Beijing University of Technology, Beijing; 100124, China