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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국해양공학회 한국해양공학회지 한국해양공학회지 제2권 제2호
발행연도
1988.12
수록면
112 - 121 (10page)

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A study on friction welding of carbon steel bar (SM45C) to chrome molybedenum steel bar(SCM4) is examined experimentally through tensile test, hardness test, microstructure test and fatigue test.
So, this paper deals with optimizing the welding conditions and analyzing various mechanical properties about friction welds of SM45C to SCM4 steel bars.
The results obtained are summarized as follows;
1) For friction welded joints of SM45C to SCM4 steel bars, the total upset(U)increases linearly with an increase of heating time(t₁) till 6 s.
2) The determined optimum welding conditions are heating time (t₁),2s, upsetting time(t₂),3 s, heating pressure (P₁), 4㎏f/㎟(39.2MPa), upsetting pressure(P₂), 8㎏f/㎟(78.4MPa) and rotating speed(N), 2,000rpm when the total upset(U) is 3.4㎜, resulting in a computed relationship between the joint tensile strength o<SUB>t</SUB>(㎏f/㎟) and the total upset U(㎜);
o<SUB>t</SUB>=0.21U³-3.38U²+ 17.03U +66.00
3) As the elongation is increased more and more, the fracture position becomes away from weld interface and the fractures are similar to those of SM45C. Fracture is taken place on SM45C side.
4) The weld interface of two dissimilar materials is mixed strongly, and the heat affected zone is about 2.0㎜ at SM45C while about 2.7㎜ at SCM4 side. Therefore, the welded zone and heat affected zone are very narrow, comparing with those of the joints welded by the other welding methods.
5) The fatigue strengths at N = 10<SUP>6</SUP> cycles of SM45C, SCM4 and friction welded joints are 23㎏f/㎟(225.4MPa), 33㎏f/㎟(220.5MPa), and 22.5㎏f/㎟(220.5MPa) respectively, and fracture at friction welded joint takes place at the side of SM45C.
6) The hardness of the friction weld interface is 3 times higher than that of base metal.
7) Fatigue strength of friction welded joint is higher than that of base metal.
8) Notch sensitivity factor of friction welded joint is lower than that of base metal.

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Abstract
1. 서론
2. 시험편 및 실험방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-559-015501738