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<p>The dissimilar welding of Ti6Al4V and Al-7075-T6 alloys was studied using a controlled short-circuit GMAW process. These alloys are highly significant in various industrial sectors, particularly aerospace and automotive, due to their physical and mechanical properties. However, their fusion welding presents challenges due to differences in physical, chemical, and thermal characteristics. The objective of this work was, therefore, to evaluate the interaction between the variables peak current, background current, and wire feed speed of the GMAW process, using the STT<sup>®</sup> technology of droplet transfer control associated with the preheating of the titanium alloy, seeking a combination that allows the dissimilar welding of these alloys, without the formation of harmful phases that compromise their properties. The joint was made by butt welding in a single bevel groove, with a 0.5 mm root opening. With 30°bevel and 180 °C preheating in titanium alloy. The weld filler metal was ER-4047. A successful union of the joints was achieved without the formation of an intermediate layer, with welding energy between 2.66 and 3.07 kJ/cm<sup>2</sup> and preheating. Therefore, the appropriate combination of welding parameters, associated with the preheating of the Ti-6Al-4V alloy, showed promise in dissimilar joining of the studied alloys.</p>

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Joining of Ti6Al4V/Al7075-T6 alloys without forming an intermediate layer by the GMAW process

  • 期刊论文

  • 发表日期：

    2025年2月7日

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  • Eduardo Pereira da Silva,
  • Carlos Alberto Carvalho Castro,
  • Edmilson Otoni Correa

摘要

The dissimilar welding of Ti6Al4V and Al-7075-T6 alloys was studied using a controlled short-circuit GMAW process. These alloys are highly significant in various industrial sectors, particularly aerospace and automotive, due to their physical and mechanical properties. However, their fusion welding presents challenges due to differences in physical, chemical, and thermal characteristics. The objective of this work was, therefore, to evaluate the interaction between the variables peak current, background current, and wire feed speed of the GMAW process, using the STT® technology of droplet transfer control associated with the preheating of the titanium alloy, seeking a combination that allows the dissimilar welding of these alloys, without the formation of harmful phases that compromise their properties. The joint was made by butt welding in a single bevel groove, with a 0.5 mm root opening. With 30°bevel and 180 °C preheating in titanium alloy. The weld filler metal was ER-4047. A successful union of the joints was achieved without the formation of an intermediate layer, with welding energy between 2.66 and 3.07 kJ/cm2 and preheating. Therefore, the appropriate combination of welding parameters, associated with the preheating of the Ti-6Al-4V alloy, showed promise in dissimilar joining of the studied alloys.