Abstract
The effect of surface oxide film on the performance and porosity of MIG welded joints of aluminum alloy profiles for high-speed rail bodies under different ambient humidity conditions was studied. The test shows that when the humidity is low (relative humidity 5% ∼ 10%), scraping to remove the oxide film and no treatment of oxide film in both cases of the weld are well formed and flawless. The difference between the two metallurgical organization and tensile properties is not significant. In higher humidity conditions (relative humidity 40% ∼ 50%), scraping to remove the oxide film and no treatment of oxide film in both states of the weld are still well-formed. However, no treatment of oxide film welded seam with porosity, welding heat input increases can reduce the porosity. For the 6005A-T6 high-speed train body profile, when the heat input reaches 4400 J/cm, the weld such porosity disappears. However, the increase in heat input will make the tensile strength of the weld reduced by about 14%.
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