Abstract
Fusion welding of heat-treatable aluminum alloys is generally accompanied by a significant decrease in mechanical properties in the HAZ caused by the dissolution of the hardening phase. The intensity of this decrease in mechanical properties can be reduced by limiting the heat input value. However, this approach is in direct conflict with the principles for welding aluminum and its alloys. Due to the very high thermal conductivity of aluminum alloys, it is necessary to use preheating for thicknesses larger than 5 mm to eliminate non-penetration and cold joints. This paper aims to show the influence of multiple temperature cycles, performed at different preheating temperatures, on changes in the microstructure and mechanical properties. At the same time, the extent to which the original properties of the material can be restored by natural and artificial aging at 160, 175 and 190 °C is also investigated.
Highlights
Heat-treatable aluminum alloys are some of the most progressive engineering materials and are used in many industries
The higher thethe preheating temperature, theintensity lower the hardness decrease depends on the heat input during welding, buttemperature, on the of the removal intensity, meaning thehigher dissolution the hardening at heatheat removal intensity, meaning theThe dissolution of preheating theofhardening phasesphases occurs at greater removal from the weld zone
This paper aimed to show the effects of multiple temperature cycles, performed at different preheating temperatures, on the changes in the microstructure and properties of a butt-welded joint performed on alloy EN AW 6061
Summary
Heat-treatable aluminum alloys are some of the most progressive engineering materials and are used in many industries. Their main advantages are their low specific weight and good corrosion resistance, combined with their very good mechanical properties. Vargas et al [1] assessed the effects of the heat input value in GMAW welding for a single pass weld measuring 4.8 mm in thickness. They found that for different heat input values, decreases in mechanical properties varying from 38% to
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