6061アルミニウム合金/S35C炭素鋼摩擦圧接継手の引張および疲労強度特性 [in Japanese] Tensile and fatigue strength of friction welded joints between 6061 aluminum alloy and S35C carbon steel [in Japanese]
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Welded joint performance of joints welded by the friction welding method has been studied for various material combinations because the method can more easily produce a combined shaft in comparison with other fusion welding method. In this study, 6061 aluminum alloy to S35C carbon steel were friction welded under three different friction welding conditions; and tensile and fatigue tests were conducted to obtain its strength characteristics in relation to the base material strength. As the result, the following were clarihed: Joint performance of friction welded joints is dependent on friction welding conditions; for this material, <i>P</i><sub>2</sub> (MPa) may be selected so that a friction welding condition for obtaining over 80% joint efficiency may exceed <i>P</i><sub>2</sub>/<i>P</i><sub>1</sub>=5 as <i>P</i><sub>1</sub>=20 MPa. The HAZ region of low hardness exists by friction heat in the aluminum alloy side near the weld interface. Though it fractures in tensile tests from the softening region and in the fatigue test, there is a case in which it fractures in a weld interface. Therefore, fatigue strength decreases from the value estimated from tensile strength; attention to this fact is required when it is designed as a structural member. A particular structure near the weld interface exists, and since even if identical friction welding is adopted for all joints, the structure is delicately different so that the structure affects fatigue crack generation. Therefore, it seems that the scatter of fatigue strength of friction welded joints is larger than that of the base metal by fracture formation.
- Journal of Japan Institute of Light Metals
Journal of Japan Institute of Light Metals 52(5), 204-209, 2002-05-30
The Japan Institute of Light Metals