东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2011, Vol. 32 ›› Issue (10): 1431-1434+1439.DOI: -

• 论著 • 上一篇    下一篇

Al-12.7Si-0.7Mg合金交流TIG焊接头组织与性能

何长树;王东;赵刚;左良;   

  1. 东北大学材料各向异性与织构教育部重点实验室;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2008AA030701);;

Microstructure and mechanical properties of Al-12.7Si-0.7Mg alloy joints welded by AC TIG welding

He, Chang-Shu (1); Wang, Dong (1); Zhao, Gang (1); Zuo, Liang (1)   

  1. (1) Key Laboratory of Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: He, C.-S.
  • About author:-
  • Supported by:
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摘要： 采用进口ER4043和ER4047作为填充焊丝对Al-12.7Si-0.7Mg合金热挤压板材实施交流TIG直缝对焊.利用金相观察、显微硬度测定及拉伸性能测试等方法研究了焊接接头的显微组织与力学性能.结果表明:在所选的焊接工艺参数条件下,交流TIG焊可以获得焊缝质量良好的焊接接头;焊缝区(WZ)是明显的熔融金属激冷形成的铸态组织,热影响区(HAZ)Si颗粒有聚集长大的趋势;接头显微硬度分布显示硬度在焊缝区达到最高,在熔合区急剧下降,在热影响区达到最低.两种焊丝焊接接头抗拉强度都达到基材的90%以上.

关键词: Al-12.7Si-0.7Mg合金, 交流TIG焊, 焊接接头, 显微组织, 力学性能

Abstract: Hot extruded Al-12.7Si-0.7Mg alloy plates were welded by tungsten inert gas (TIG) welding method using imported ER4043 and ER4047 welding wire. The microstructures and mechanical properties of welded joints were studied by optical microscopy, microhardness test and tensile test methods. The results showed that weld beads are fairly good under the chosen welding parameters. The weld zone (WZ) is the typical casting structure formed during weld solidification. Coarsening of silicon phase was observed in the heat-affected zone (HAZ). The distribution of microhardness of the welded joints shows that the hardness gets maximum values in WZ, drops rapidly in fusion zone (FZ) and reaches to minimum values at HAZ. The tensile strength of the joints welded with either ER4043 or ER4047 welding wire reach more than 90% of the base material.

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