Abstract
Tungsten inert gas welding and vacuum brazing butt joints of Al–Mg–Si alloy 6061 in the artificially aged condition T6 were studied. Constant amplitude and variable amplitude fatigue loading tests were performed. The experimental S-N curves were compared with the fatigue design curves recommended by the International Institute of Welding, British Standard, and Eurocode 9. Two mean stress correction methods, Goodman and Gerber, were evaluated. In terms of the size effect on the fatigue life, this article proposed an innovational thickness correction method based on the ratio of the ultimate tensile strengths of specimens with different thickness. For vacuum brazing components, the tensile strength–based thickness correction method was better than the thickness correction methods recommended by the International Institute of Welding and Eurocode 9.
Highlights
Environmental problems and concerns about energy consumption have led to the increasing use of aluminum alloys in the automobile, aerospace, and other industries
This study investigates the fatigue behavior of 6061-T6 aluminum alloy butt welded by tungsten inert gas (TIG) welding and Vacuum brazing (VB)
Unlike TIG welding, VB resulted in no obvious variations among brazing bead, heataffected zone (HAZ), and base metal
Summary
Environmental problems and concerns about energy consumption have led to the increasing use of aluminum alloys in the automobile, aerospace, and other industries. Butt welding has numerous advantages such as good connection efficiency, easy workmanship, and weight reduction.[3] The wide range of application of butt welds in various structures provides researchers a large scope for analyzing their behavior under various loading conditions.[4] The frequently preferred process for welding aluminum alloy is tungsten inert gas (TIG) welding owing to its relative simplicity and cost. This process causes grains to coarsen in the fusion zone, distortion, hot cracking, and residual stresses.
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