Addition of nitrogen to shield gas (He) in MIG welding of aluminum alloys
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In the previous paper it was reported that grains in bead of MIG welded aluminum alloys were refined and welding cracks were decreased by the addition of nitrogen to argon gas.However, the welding usability was lowered by the addition of nitrogen; i.e., the stability of arc was made poor and the appearance of bead was made irregular.In order to avoid the above defects, He-N2 mixed gas was used for MIG welding of the specimens instead of Ar-N2 mixed gas.The following results were obtained.(1) Arc was made more stable and the appearance of bead was also made better in He-N2 than in Ar-N2 gas.(2) The depth of penetration was increased by the addition of nitrogen.(3) The grains in bead were refined by MIG welding in He-N2 as well as in Ar-N2 gas, when Al-Zn-Mg alloys containing small amounts of titanium and zirconium (which are powerful elements for grain refining) were used for the parent metal.(4) Welding cracks were decreased in inert gases containing nitrogen for the welding of Al-Zn-Mg alloys.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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