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A5J32/A5052 이종 알루미늄 합금 겹치기 마찰교반접합부의 인장성질에 미치는 재료배열 및 접합조건의 영향
윤태진,강명창,강정윤,Yoon, Tae-Jin,Kang, Myung-Chang,Kang, Chung-Yun 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
A5J32-T4 and A5052-H32 dissimilar aluminum alloy plates with thickness of 1.6 and 1.5 mm were welded by friction stir lap welding (FSLW). The FSLW were studied using different probe length tool and various welding conditions which is rotation speed of 1000, 1500 rpm and welding speed of 100 to 600 mm/min and material arrangement, respectively. The effects of plunge depth of tool and welding conditions on tensile properties and weld nugget formation. The results showed that three type nugget shapes such as hooking, void, sound have been observed with revolutionary pitch. This plunge depth and material arrangement were found to effect on the void and hooking formation, which in turn significantly influenced the mechanical properties. The maximum joint efficiency of the FSLWed plates was about 90% compared to base metal, A5052-H32 when the A5052-H32 was positioned upper plate and plunge depth was positioned at near interface between upper and lower plates.
A5052-H112 합금의 겹치기 마찰교반접합 조직 특성
고영봉,이중헌,박경채,Ko, Young-Bong,Lee, Joong-Hun,Park, Kyeung-Chae 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6
The Friction Stir Welding(FSW) has mainly been used for making butt joints in Al alloys. Development of Friction Stir Lap Welding(FSLW) would expand the number of applications. Microstructure of FSLW in A5052-H112 alloy was investigated under varying rotation and welding speed. As the rotation speed was increased and the welding speed was decreased, a amount of heat was increased. As a result, bead interval was narrower, bead width are larger, and experimental bead interval was almost similar to theoretical bead interval. Typical microstructures of FSLW A5052-H112 alloy consist of three zones, including Stir Zone(SZ), Thermo-Mechanically Affected Zone(TMAZ) and Heat Affected Zone(HAZ). As a amount of heat was increased, average grain size was larger in three zones. Nevertheless, the aspect ratio was almost fixed for FSLW conditions. The misorientation of SZ, HAZ and TMAZ was examined. A large number of low angle grain boundaries, which were formed by severe plastic deformation, were showed in TMAZ as comparison with SZ and HAZ. Microhardness distribution was high in order of BM, SZ, TMAZ, and HAZ. The Micro-hardness distribution in HAZ, TMAZ of upper plate were lager than lower plate. Relationship between average grain size and microhardness was almost corresponded to Hall-Petch equation.
알루미늄 합금의 이종겹치기 마찰교반용접시 판재의 위치설계가 기계적 강도에 미치는 영향에 관한 연구
박희상(Hee Sang Park),고준빈(Jun Bin Ko),최원두(Won Doo Choi),최만용(Man Young Choi) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.3
Recently, the use of means of transportation of the lightweight aluminum to temper the trend is increasing. More efficient use of lightweight aluminum material to Friction stir welding has been widely attempted. Types of welding tools at the right screw to rotate anti-clockwise direction, when the tensile stress exerted on the location of the top plate to the left in the direction of the welding process to the installation was able to obtain high tensile strength. A5052 to the top of the left in the direction of the welding process to install and, when you installed the right under the A6061 was not easily come up to the top of the A5052. Conversely, at the bottom left to install on top of the A6061 and A5052 have been installed at the bottom of the upper area of the A6061 and A5052 intrude easily form the shape of the hill you can see that it was formed.
하이브리드(CW Nd : YAG Laser+MIG) 용접을 이용한 A5052-H32 맞대기 용접부의 역학적 특성에 관한 연구
김준형(Jun-Hyung Kim),방한서(Han-Sur Bang),엠.에스.비죠이(M.S. Bijoy),전근홍(Geun-Hong Jeon),유재선(Jea-Sun You),방희선(Hee-Seon Bang) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
Recently, the application of aluminum alloys has been increasing for lightweight and high quality transport vehicles. Therefore, the proposal has been made to apply high speed hybrid welding methods to the marine grade aluminum alloy (A5052) used for shipbuilding by combining a 3-KW CW Nd : YAG laser and tire MIG welding process. In this study, the characteristics of the welding parameters were investigated for a hybrid butt joint. This paper also describes the determination of the heat distribution in a weldment and tire welding residual stress using a finite element method. Mechanical experimentation was also used to ascertain the reliability of tire weldment.
5052 알루미늄 합금에서 접합변수에 따른 겹치기 마찰교반접합부의 특성
고영봉(Young-Bong Ko),박경채(Kyeung-Chae Park) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.5
The Friction Stir Welding (FSW) has mainly been used for making butt joints in Al alloys. The development of Friction Stir Lap Welding (FSLW) would expand the number of applications. In this study, microstructures and mechanical properties of FSLW in A5052 alloy were investigated under varying rotating speed and probe length. Investigating the characteristics as FSLWed conditions were as below ; Failure Maximum load by shear fracture was increased proportional to the width of joint area, which was increased by input heat, stirring intensity in the case of 2.3 mm probe length. Tensile fracture occurred, and maximum load was determined due to side worm hole of joint area and softening of microstructure in the case of 3.0 mm probe length. In the case of 3.7 mm probe length, material hook and bottom worm hole were appeared at the end interface of joint area. The most sound FSLW condition with no defects was 3.0 mm probe length and 1500 rpm-100 mm/min. No defects were showed in 1500 rpm-100 mm/min and 1800 rpm-100 mm/min, but Vickers microhardness distribution in TMAZ/HAZ which was fracture zone was lower in 1800 rpm-100 mm/min than in 1500 rpm-100 mm/min. In this condition highest tensile strength, 215 MPa (allowable rate 78% of joint efficient) was obtained.
프루브 길이에 따른 A5052 겹치기 마찰교반접합 특성
고영봉(Young-Bong Ko),강채원(Chae-Won Kang),최준웅(Jun-Woong Choi),박경채(Kyeung-Chae Park) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.6
The Friction Stir Welding (FSW) has mainly been used for making butt joints in Al alloys. The development of Friction Stir Lap Welding (FSLW) would expand the number of applications. In this study, for effective application on thin aluminum alloy lap joint, non-heat treatment A5052 alloys were joined by FSLW with the length of probe 2.3 ㎜ and 3.0 ㎜. Investigating the characteristics of joint area showed the results were as below ; When the length of probe was 2.3 ㎜, good joint area was formed at all welding condition except for 600 rpm-700 ㎜/min. In the case of 3.0 ㎜ probe length, there was formed good joint area without defects at 1500 rpm-100 ㎜/min. The width of joint area, position and size of defects were very important factors for FSLW, due to heat input and stirring intensity.