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쵸듀랄루민-탄소강 마찰용접부의 기계적 성질에 관한 연구
윤병수(Beong Su Yeun),민택기(Taeg Ki Min) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.1
This study was investigated on mechanical properties of super duralumin and carbon steel in the friction welding used insert metals. The tensile test, bending test, shearing test and hardness test of welded joints were investigated through this experiment. When aluminium alloy A6351-T4 was used as insert metal. The mechanical properties of friction welds became better than that of direct friction welding. Optimal welding conditions were n=2,000rpm. P₁=40㎫, P₂=140㎫, t₁=1.5sec and t₂=5sec.
금속응고로 제조된 A12024/Al₂O₃ 의 마찰용접성에 관한 연구
안창윤(Chang Yun An),강성보(Sung Bo Kang),윤병수(Beong Su Yeun),이봉상(Bong Sang Lee),민택기(Taeg Ki Min) 대한공업교육학회 1999 대한공업교육학회지 Vol.24 No.1
This study was carried out to investigate the friction weldability of rapidly solidified Al2024/Al2O3. The experimental results are summarized as follow ; In case of Al2024, the tensile strength of friction welded joint is 201㎫ and hardness(Hv) is 141, under the condition of friction time is 1.0sec, upset pressure is 84㎫. In case of Al2024/Al2O3, the tensile strength is 202㎫ and hardness(Hv) is 188, under the condition of friction time is l.0sec, upset pressure is 76㎫. Although each material has non-weldability and not gas-removal-treated, joint efficiency is 60% either Al2024 or Al2024/Al20O3. This results shows that friction welding has better weldability than fusion welding.
SM25C의 마찰용접에서 용접면에 가공된 홀의 영향에 관한 연구
윤병수,홍일표,민택기,김진건 忠南大學校 産業技術硏究所 1999 산업기술연구논문집 Vol.14 No.1
This study deals with friction welding of SM25C. One of test material has a hole in the center, but the other is not. Then,same friction welding condition is applied. Friction welding is conducted with varying hole diameter at one material. The results obtained are as follows. 1. When the diamether of machined hole is 4mm, the highest bending strength of friction wleld was 1569MPa which was about 120% of base metal strength. 2. When the diameter of machined hole is 6mm, the highst shear strength of friction weld was 512MPa which was about 115% of base metal strength. 3. The machined hole at one material can be increased in the bending and shear strength.
강성보,윤병수,홍일표,민택기 忠南大學校 産業技術硏究所 1998 산업기술연구논문집 Vol.13 No.1
This study deals with the friction weldability of STS304 Austenitic stainless steel to 6000 series aluminium alloys, those are A6061-T6, A6063, A6351. The total upset the biggest in case of STS304-A6063 and depend on strength of aluminium alloy. All welded specimen in the condition of upset pressure 75MPa exceeded the tensile strength of base metal. As a result of analyzing the tensile fracture surfaces, it showed ductility in case of both STS304-A6063 and STS304-A6351, while it showed poor ductility in case of STS304-A6061-T6. The results of bending test coincide with characteristic of tensile fracture surfaces. In the case of STS304-A6063 and STS304-A6351, any crack did not appear in welded joint, even in bending up to 90o. As a result of EDAX analysis of welded joint, it has been confirmed that Ni, Cr and Fe in STS304 were diffused toward aluminium alloy side. Consequently, friction weldability of STS304-aluminium alloys is determineded by combination of micro deformation and diffusion.
ST304 오오스테나이트 스테인레스강과 알루미늄 합금 6351 마찰용접부의 기계적성질에 관한 연구
민택기,홍일표,민홍,윤병수,강성보 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.1
This report deals with the mechanical properties of STS304-Al 6351 friction welds. Main results obtained are as follows. Under the condition of upset pressure 75MPa, the tensile strength of STS304-Al 6351 friction weld interface was higher than that of Al 6351 base metal, and at the highest tensile strength(295MPa) was obtained at upset pressure 150MPa. The result of bend test shows that the bend ductility reflected the character of tensile fracture surface is improved while upset pressure increases up to 150MPa, and at the condition of upset pressure 150MPa, bended angle can reaches over 90。without crack. The hardness profile across the weld interface shows that the hardness of both STS304 and Al 6351 is higher around the weld interface, and sharply increased hardness on the STS304 side is related with the plastic deformation of micro volume.