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J. Ocean Eng. Technol. 1990;4(2):94-99.    

Study on Friction Welding of Torsion Bar Material(II) - Effect of PWHT on Friction Weld Quality-
Oh Sae-Kyoo,Lee Jong-Du
토션바재의 마찰용접에 관한 연구(II) -용접 후열처리가 마찰용접 품질에 미치는 영향-
오세규,이종두
부산수산대학교 기계공학과,부산수산대학교 기계공학과
© 1990 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: PWHT, Post Weld Heat Treatment, Tensile Strength, Torsional Strength, Impact Energy, Hardness Distribution of HAZ, Micro Structure
핵심용어: 용접후열처리, 인장강도, 비틀림강도, 충격에너지, 열영향부의경도분포, 미시조직
Abstract
This paper deals with investigating experimentally the effects of PWHT on the weld quality such as strength, toughness, hardness and micro-structure of the welded joints in friction welding of torsion bar material SUP9A bar to bar. The results obtained are summarized as follows; 1) It was certified that the condition of the post-weld heat treatment(PWHT) for the friction welded joints was very satisfactory because both strength and toughness of the joints were improved as almost same as those of the base metal or better by the PWHT. 2) The peak of hardness distribution of the friction welded joints can be eliminated by PWHT, resulting in being almost equalized at the weld interface, the HAZ(heat affected zone) and the base metal. 3) The micro-structure of the base meta., HAZ and weld interface(WI) of friction welded joints welded at the optimum welding condition consists of the same sorbite structure obtained by PWHT and fined sorbite at WI, resulting in increasing toughness as well as strength, and no micro structural defect has been found at the friction welded zone.


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