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Korean Journal of Metals and Materials > Volume 55(10); 2017 > Article
Korean Journal of Metals and Materials 2017;55(10): 716-723. doi: https://doi.org/10.3365/KJMM.2017.55.10.716
Al 5083 합금 용접부의 기계적 물성에 미치는 Mg의 영향
김동윤, 김동철, 강문진, 김영민
한국생산기술연구원 용접접합그룹
Effect of Aluminum Welding Wire Mg Content on the Mechanical Properties of Al 5083 Alloy Weld Metal
Dongyoon Kim, Dongcheol Kim, Munjin Kang, Young-Min Kim
Joining R&D Group, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea
Correspondence  Young-Min Kim ,Tel: +82-32-850-0232, Email: ymkim77@kitech.re.kr
Received: 8 May 2017;  Accepted: 10 July 2017.  Published online: 28 September 2017.
ABSTRACT
A new aluminum welding wire with 0.8 wt% higher in Mg content was developed and compared with commercial welding wire of the 5000 series. The weldability of the Al5083 base material was evaluated using high current metal inert gas (MIG) welding, using the developed Al5183 and commercial Al5183 welding wire. For the wire with 5.1 wt% Mg content, the hardness of the weld metal decreased with increasing heat input to the center of the weld under low and high heat input conditions. For the wire with 5.9 wt% Mg content, the hardness of the weld metal did not decrease under low and high heat input conditions. The wire with 5.1 wt% Mg content exhibited a tensile strength of about 300 MPa under the low/medium heat input conditions. The tensile strength decreased to 284 MPa under high heat input conditions. However, the welding wire with 5.9 wt% Mg content exhibited a tensile strength of 300 MPa regardless of the heat input condition. Dendritic microstructures were observed in the center of the welds in both wires, with Mg contents of 5.1 wt% and 5.9 wt%, and the second dendrite arm spacing (SDAS) increased with increasing heat input.
Keywords: aluminum 5083 alloy, magnesium, welding wire, metal inert gas welding, tensile strength, hardness
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