Effect of Bevel Angles on Friction Welding Structure of Spheroidal Graphite Cast Iron to Mild Steel

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  • 球状黒鉛鋳鉄と軟鋼との摩擦圧接継手組織に及ぼす開先角度の影響
  • キュウジョウ コクエン チュウテツ ト ナンコウ ト ノ マサツ アッセツ ツギテ ソシキ ニ オヨボス カイサキ カクド ノ エイキョウ

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Abstract

  Friction welding of spheroidal graphite cast iron (FCD) to mild steel (S20C) were carried out under various bevel angles. The friction surfaces of FCD and S20C were bevel processed with a lathe before friction welding, and the friction welding condition were constant. The friction welding process by the bevel process was examined under various friction times. The dimensions of the test pieces were 15mm in diameter and 70mm in length respectively. Micro and macroscopic observations were employed in order to clarify characteristics at the welding interface.<br>  The structure of friction welding interface was mainly influenced by the bevel angle. The deformation layer of spheroidal graphite (DLSG) was observed when the bevel angle was small, but not when large. When the bevel angle was small, the DLSG formed at the initial stage of friction welding concentrated at the center of the specimen during friction welding, and remained at the joining interface after friction welding. When the bevel angle was large, the DLSG was discharged out of the specimen during friction welding, and did not remain in the joining interface after friction welding.

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