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Effect of core bar inserted into weld faying part to obtain an ideal pipe joint with non-generating inner flash via friction welding

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Advances in Manufacturing 2020年第3期8卷 418-428页

作者： M.Kimura S.Iwamoto M.Kusaka K.Kaizu Department of Mechanical Engineering Graduate School of EngineeringUniversity of HyogoShosha 2167HimejiHyogo671-2280Japan Department of Mechanical Engineering University of HyogoShosha 2167HimejiHyogo671-2280Japan

In this study,the effect of core bar inserted into weld faying part to obtain an ideal pipe joint with non-generating inner flash via friction welding is described.A steel pipe with inner and outer diameters corresponding to 8.0 mm and 13.5 mm was used,and the weld faying surface was machined to a groove shape of a flat(butt)*** core bar of various materials was inserted in the weld faying part of the pipes,and those pipes were welded with a friction speed of 27.5 s−1 and friction pressure of 30 *** core bars did not decrease inner flash when joints were fabricated with a core bar of some metallic materials with melting points below that of steel;thus,they were melted during the welding *** joint with an alumina core bar did not decrease inner flash and was crushed by generating an inner ***,a commercially pure tungsten(CP-W)core bar was successfully achieved for decreasing the inner ***,all joints with a CP-W core bar did not exhibit the tensile strength of the base metal and a fracture in the base metal,when they were fabricated during the same time,the friction torque reached the initial *** joint exhibited a fracture in the base metal when it was fabricated with a CP-W core bar and a taper groove shape that was proposed in the previous ***,the core bars were easily removed from the joints;thus the joint with almost no inner flash was successfully *** reduce the inner flash of pipe joints,they should be fabricated with a CP-W core bar inserted into the weld faying part with a taper groove shape.

关键词： Friction welding Steel pipe Inner flash Core bar Joint strength taper groove shape

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