Forming characteristics and mechanism of double-sided heat source synergic vertical welding on an aluminum alloy

Top-quality aluminum alloy weld beads, exploiting the double-sided heat source synergic welding (DSHSSW) process, were obtained with medium heat input, no arc spacing, no root gap, and upward vertical direction. The energy utilization was reduced with the augmented arc spacing because of the attendant increased heat dissipation. Compared with one-side welding (OSW), the fusion area and melting efficiency of DSHSSW were enormously raised, indicating the enhancement of melting performance and energy utilization, and superior joints could be fabricated using DSHSSW under the identical heat input. Additionally, the DSHSSW arc was constricted and thus improved the energy density in contrast to OSW. As the weld penetration deepened during DSHSSW, the heat conduction space was diminished, and the heat accumulation effect was generated. The arc contraction and heat accumulation effect mutually lead to the increased penetrating ability during DSHSSW.

Automated summary

The DSHSSW process produces top-quality aluminum alloy weld beads with enhanced fusion area and melting efficiency compared to one-side welding (OSW). The process utilizes medium heat input, no arc spacing, no root gap, and upward vertical direction, resulting in superior joints and improved energy utilization. Additionally, DSHSSW leads to increased penetrating ability through arc constriction and heat accumulation effects as weld penetration deepens.