Development of Spot Friction Welding

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  • 摩擦点接合技術の開発
  • マサツテン セツゴウ ギジュツ ノ カイハツ

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  Spot friction welding (SFW) is a cost-effective spot joining technology for aluminum sheets, capable of delivering better quality compared with resistance spot welding (RSW). In this study, this technology is applied to the joining of steel and aluminum together. The fusion welding between steel and aluminum is known to be difficult for sufficient strength due to the formation of brittle intermetallic compounds. SFW is a solid state, low temperature joining process using friction heat, so that it's possible to prevent the formation of brittle intermetallic compounds in the joints between steel and aluminum. Tensile shear test was conducted and the joint state was investigated by optical microscope and EPMA. Any remaining coating at the joint interface not removed by the plastic flow will prevent a good contact of the fresh surfaces of aluminum and steel. As a consequence, the joint strength decreases due to the difficulty of removing galvanized coatings with high solidus temperature. In addition, investigation result of steel SFW is also introduced.<br>

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