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JWJ > Volume 26(4); 2008 > Article
Journal of KWJS 2008 August;26(4) :73-78.
Published online September 24, 2008.
Microstructure and Mechanical Properties of Clad(A4045/A3003) Al Alloy by Gas Tungsten Arc Welding
Ki-Bin Kim, Jin-Seon Gook, Dong-Ju Yoon, Byung-Il Kim, Il-Cheon Lee




Correspondence:   Published online September 24, 2008
ABSTRACT
  In this paper, research was the variation of microstructure and mechanical properties of clad(A4045/A3003) Al alloy sheet by gas tungsten arc welding. Tensile properties of the gas tungsten arc welding joint decreased because of the softened heat affected zone(HAZ). The hardness of HAZ was lower than that of base metal, because relieved the work hardening effect of the welding heat. Hardness distribution of the weld zone with the base metal appears similarly, but the hardness of HAZ decreased remarkably. The microstructure in the weld zone of A4045 clad layer was formed a coarse columner grains of Si-rich. In the case of large weld heat input, the Si of the A4045 were diffused and until A3003 weld zone they decreased the strength.
Keywords: TIG welding;Clad(A4045/A3003) Al alloy;HAZ;Work hardening;Columner grains
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