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J. Ocean Eng. Technol. 1990;4(1):101-109.    

Study on Friction Welding of Torsion Bar Material(1) -Optimization of Friction Welding Technique-
토션 바재의 마찰용접에 관한 연구(I) -마찰용접기술의 최적화에 대하여-
오세규,이종두
부산수산대학교 박용기계공학과,부산공업대학 금형공학과
© 1990 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Heating time, Upsetting time, Heating pressure, Upsetting pressure, Optimum heating time zone, Optimum upset zone
핵심용어: 가열시간, 업셋시간, 가압력, 업셋압력, 최적가열 시간범위, 최적업셋량 범위
Abstract
The friction welding has more technical and economic advantages than the other welding processes. As this welding process has the characteristics such as curtailment of production time, materials, cost reduction, etc., it has been widely used in production of various mechanical components which have complex shapes. So, this paper deals with optimizing the friction welding conditions and analyzing various mechanical properties of the friction welded joints of torsion bar material SUP9A bar to bar. The results obtained are summarized as follows; 1) The quantitative relation between heating time($t_{1}$, sec) and total upset(U, mm)can be obtained. The empirical formula obtained is ; U = 3.29$t_{1}$ + 1.6 2) The tensile strength($sigma_{t}$, kgf/$mm^{2}$) of friction welding joints as post weld heat treated(PWHT) depends upon heating time($t_{1}$, sec) quantitatively and the empirical formula obtained is ; $sigma$= -5.1$t_{1};^{2}$+44.90$t_{1}$+45.2 3) It is certain that the optimum condition for friction welded joints of SUP9A steel bars of diameter 14.5mm is, considering on various properties such as tensile strength, torsional strength, impact energy and strain of the joints after PWTH ; n = 2000rpm, $P_{1}$=8kgf/$mm^{2}$, $P_{2}$=20kgf/$mm^{2}$, $t_{1}$=4sec, $t_{2}$=3sec 4) The tensile strength, torsional strength and hardness were increased with the increased with the increasing carbon equivalent, but toughness was decreased.


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