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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.
삽입재를 사용한 A2024-T6와 SM45C의 마찰용접에 관한 연구
강성보,윤병수,민택기 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.5
This study was undertaken to investigate the friction welding of A2024-T6 aluminum alloy and SM45C carbon steel using insert metals. The relationships among the friction welding conditions, the tensile strength of joints, the hardness distribution of welds, the microstructure of welds and the tensile fracture surfaces were mainly investigated through this experiment. When the A6063-T5 aluminum alloy of insert metal was used, the maximum tensile strengh of joint was obtained. In this case, the maximum joint efficiency was 75.3 percent and in the case of unusing the insert metals, it was 37.7 percent. Optimal welding conditions were N=2000rpm, P$_1$=40MPa, P$_2$=140MPa, t$_1$=1.0sec and t$_2$=5sec.
동-텅스텐 소결합금(Cu-W)과 동(Cu)의 마찰용접에서 마찰압력이 접합강도와 파단특성에 미치는 영향
강성보,민택기 대한용접접합학회 1997 대한용접·접합학회지 Vol.15 No.4
A copper-tungsten sintered alloy(Cu-W) has been friction welded to a tough pitch copper in order to investigate the effect of friction pressure on bonding strength and a charicteristic of fracture. The tensile strength of the friction welded joint was increased up to 90% of the Cu base metal under the condition of friction time 1.2 sec, friction pressure 4.5kgf/$\textrm{mm}^2$ and upset pressure 10kgf/$\textrm{mm}^2$. From the results of fracture surface analysis, the increase of friction pressure could remarkably decrease the force and the time to be normally acted on weld interface. The W particles which were included in the plastic zone of Cu side could induce fracture adjacent to the weld interface because their existance in Cu induces a decrease in available section area and an increase in notch effect. Therefore, the tensile strength was decreased at high friction pressure (6kgf/$\textrm{mm}^2$) because the destruction of W was increased by an increase in mechanical force and crack was formed at weld interface.
탄소h강(SM45C)과 알루미늄 합금(A6063)의 마찰용접성에 관한 연구
강성보,민택기 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.2
This study deals with the friction weldability of machine structural carbon steel (SM45C) to Al-Mg-Si aluminium alloy (A6063). The bonding strength of friction welded joints, from all mechanical test, exceeded that of A6063 base metal, under the condition of friction time 1.5 sec, upset pressure 80MPa. The friction welded joints under these conditions exhibited tensile strength of 262MPa, bending angle of 90$^{\circ}$ without crack at weld interface and shear strength of 113MPa. Consequently, the friction weldability of SM4C to A6063 was very excellent, and that was possible without special preparation of weld surfaces.
동-텅스텐 소결합금(Cu-W)과 동(Cu)의 마찰용접 특성에 미치는 업셋압력의 영향에 관한 연구
강성보,민택기 대한용접접합학회 1999 대한용접·접합학회지 Vol.17 No.5
A copper-tungsten sintered alloy(Cu-W) has been friction welded to a tough pitch copper in order to investigate the effect of upset pressure on friction weldability. Under the condition of friction time 0.8sec, upset pressure 150MPa, the tensile strength and Charpy impact value of the friction welded joint were 336MPa, $400KJ/m^2$ respectively. And highest temperature of the weld measured was below $800^{circ}K$ which is very lower than melting point of Cu($1356^{circ}K$). Under the same conditions, W grains picked up in Cu matrix from Cu-W profitably affected on these mechanical fracture, and were dispersed in Cu by plastic flow during brake time.
CuW와 Cu를 이용한 마찰용접부의 미세조직에 관한 연구
姜聲甫,閔宅基,洪日杓 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
This report deals with the microstructure when the friction welding between CuW and Cu. As a result of microstructure analysis, the application of high friction pressure and upset pressure is able to decrease bonding strength because the microstructure of weld interface is changed abruptly. The fine tungsten grains at high friction pressure(6kg/㎟) could induce the crack formation along weld interface and fracture adjacent to the weld interface. HAZ of Cu side was narrowed with high friction pressure because time required to reach steady state was decreased.
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.