Analysis and Preventive Measures on Welding Repair Problem in Gypsum Mould Precision Casting Al Alloy

Wang Kuangfei; Zhou Zhijie; Zhang Jinzhi; Xu Guangtao

doi:10.15980/j.tzzz.2014.07.021

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Analysis and Preventive Measures on Welding Repair Problem in Gypsum Mould Precision Casting Al Alloy
Vol. 34, Issue 7, Pages: 740-742(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.07.021

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[1]王狂飞,周志杰,张锦志,许广涛.石膏型铝合金精铸件缺陷无法补焊问题的解决措施[J].特种铸造及有色合金,2014,34(07):740-742.

Wang Kuangfei, Zhou Zhijie, Zhang Jinzhi, et al. Analysis and Preventive Measures on Welding Repair Problem in Gypsum Mould Precision Casting Al Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):740-742(2014)
[1]王狂飞,周志杰,张锦志,许广涛.石膏型铝合金精铸件缺陷无法补焊问题的解决措施[J].特种铸造及有色合金,2014,34(07):740-742. DOI： 10.15980/j.tzzz.2014.07.021.

Wang Kuangfei, Zhou Zhijie, Zhang Jinzhi, et al. Analysis and Preventive Measures on Welding Repair Problem in Gypsum Mould Precision Casting Al Alloy. [J]. Special Casting & Nonferrous Alloys 34(7):740-742(2014) DOI： 10.15980/j.tzzz.2014.07.021.

摘要

对铝合金石膏型真空浇注加压凝固精铸件上表面缺陷无法补焊问题进行分析

发现由于铝合金在精炼过程中存在吸氢过量

导致在凝固时向Al2O3双膜迁移。当对铸件上表面缺陷进行补焊时

补焊区周围的氢随着温度的升高向Al2O3双膜处偏聚

双模内压力增大

最终导致双膜破裂而无法焊合。通过除氢以及密度检验

可以将铝液中的氢含量控制在一定范围

就可避免无法焊合的问题。

Abstract

Welding-repair failure of aluminum alloy parts produced with gypsum mould by investment casting combining with vacuum pouring and solidification under pressure were analyzed. The results show that excessive hydrogen absorbed in the refining process can migrate towards the oxides and Al2O3double membrane in the process of solidification. During welding repair at defect surface of the upper castings

hydrogen concentration around the repair welding areas partially plays toward the Al2O3double membrane with the temperature increases

leading to the double membrane rupture to failure of welding repair as a result of pressure increase. By the degassing treatment and density measurement method

the hydrogen content in the Al alloy melt was controlled in a certain range

and failure of welding-repair could be improved.