Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 12, Issue 7, Pages 579-585Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/174329307X227210
Keywords
AA2219; pulsed electron beam welding; gas tungsten arc welding; multipass; mechanical properties
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Despite its excellent weldability characteristics, AA2219 suffers from poor fusion zone strength under the as welded condition. In the present work, it is attempted to increase the mechanical properties of the as welded fusion zone of this alloy by increasing the weld cooling rates and multipass welding. The cooling rate was increased with the use of high intense heat source, namely electron beam in a pulsed current mode. Multipass gas tungsten arc welding was carried out using direct current straight polarity. These techniques resulted in a significant improvement in fusion zone hardness and tensile properties, which is attributed to reduced copper segregation and natural aging as well as aging caused by heat of multipass welding.
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