Study of Weld Deposits Tensile Strength in the AA2024-T3 Alloy
DOI:
https://doi.org/10.18667/cienciaypoderaereo.708Keywords:
Mechanical strength, GTAW-P, fracture, hot crackingAbstract
This paper examines the tensile strength of different weld deposits on sheets of AA2024-T3 AlClad aluminum alloy. The weldability of this alloy under arc welding processes is considered limited due to its sensitivity to hot cracking. Therefore, it has been widely studied in solid-state or laser processes in which the thermal impact is reduced. The research aims to study the mechanical behavior of said aluminum alloy when local technology is used for welding. Experimentation included the use of deposits elaborated with combinations of non-consumable violet point electrode, non-consumable green point electrode, ER4043 filler metal, and without filler metal (autogenous welding). Mechanical tests were performed under the ASTM E8 standard and following the recommendations of the AWS D1.2 standard. The corresponding study of fractured surfaces in each deposit was also carried out. Results show a considerable reduction in both mechanical resistance and ductility as a result of the strong presence of porosity, which triggered cracks of various sizes, also linked to embrittlement by hydrogen and the presence of second-phase particles at grain boundaries.
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