Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
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A Study on Tensile Properties and HAZ Softening Depending on the Amount of Heat Input in MIG Welding of Al6082-T6

Al6082-T6의 MIG용접부에서 입열량에 따른 열영향부의 연화와 인장특성에 관한 연구

  • Baek, Sang-Yeob (Div. of Industrial Facility Automation Engineering., Korea Polytechnic VII) ;
  • Park, Kyung-Do (Engineering R&D Institute, DongHwan Ind. Corp.) ;
  • Kim, Won-Il (The school of Mechanical Engineering and Automation., Kyungnam Univ.) ;
  • Cho, Sang-Myung (Div. of Advanced Materials Sci. and Eng., Pukyong National Univ.)
  • 백상엽 (한국폴리텍VII대학 산업설비자동화과) ;
  • 박경도 (동환산업(주) 기술연구소) ;
  • 김원일 (경남대학교 기계자동화공학부) ;
  • 조상명 (부경대학교 신소재공학부)
  • Received : 2010.01.18
  • Accepted : 2010.12.07
  • Published : 2011.02.28
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Abstract

Al6082-T6 is widely used because of its corrosion resistance and excellent strength. HAZ softening occurs in MIG welding process for this aluminium alloys because this aluminium alloy is heated to higher temperature than its aging temperature during welding. Therefore, low heat input and minimum standard deviation of heat input are required for narrow HAZ width and, for higher strength of welds. In this study, Al6082-T6 was used to examine for HAZ softening with various heat input in aluminium MIG welding. For weldments, micro hardness was measured and tensile test was carried out. Minimum hardness was increased at high speed welding such as 80cm/min and 120cm/min in welding speed comparing with 40cm/min. Also, in case of high speed welding such as 80cm/min and 120cm/min, tensile strength of weldments was increased about 10% comparing with low speed welding(40cm/min).

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References

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