In recent years, carbon dioxide emissions have been regulated for the purpose of preventing global warming. In this context, aluminum has been used in many automotive parts such as engines, wheels, and heat exchangers because of its light weight, high specific strength, and excellent corrosion resistance. However, unlike steel, which can be welded with high quality and durability, aluminum alloys have the disadvantage of requiring a higher welding current, two to three times higher than that of steel, because of their higher thermal and electrical conductivities than steel. In this study, we attempted to obtain high tensile strength at low power by inserting H2O at the joint interface in resistance welding of aluminum alloy A6061 aluminum alloy and using the volume expansion during vaporization to break the oxide film. As a result, it was found that inserting H2O at the bonding interface increased the strength in the specimen treated with sodium hydroxide.
Jianquang et al. (Wed,) studied this question.