Effects of Drawing Parameters on Mechanical Properties in High Frequency Induction Welded Tubes of BASIII Alloy for Heat-exchangers

Gook, Jin-Seon; Kim, Nak-Chan; Song, Jung-Keun; Jeon, Dong-Tae

Journal of KWJS 2004;22(4):65-72.
Published online September 15, 2004.

[연구논문] 열교환기용 BASIII합금 고주파유도용접관에서 인발조건이 기계적 특성에 미치는 영향

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Effects of Drawing Parameters on Mechanical Properties in High Frequency Induction Welded Tubes of BASIII Alloy for Heat-exchangers

Jin-Seon Gook, Nak-Chan Kim, Jung-Keun Song, Dong-Tae Jeon

Abstract

The aim of this study is to investigate the optimum drawing parameter for BASIII welded tubes. The BASIII aluminium alloy tubes with 25.4mm in external diameter and 1.5mm in thickness for heat-exchangers were manufactured by high frequency induction welding with the V shaped convergence angle 6.8" and power input 50KW. With increasing the reduction of area (1.6, 5.8, 11.5, 14.2, 18.5, 22.5%) by drawing, tensile strength was increased and elongation was decreased. With increasing the reduction of area by drawing, hardness in weld metal increased rapidly, while that of base metal increased slowly. In the specimen with the outer diameter smaller than 22mm, hardness of weld metal was higher than that of base metal. The optimum drawing parameter of area reduction was estimated about 15% because of the work hardening of welds.