Stability and Heat Input Controllability of Two Different Modulations for Double-Pulse MIG Welding

Stability and Heat Input Controllability of Two Different Modulations for Double-Pulse MIG Welding

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Aluminum alloy welding frequently experiences difficulties such as heat input control, poor weld formation, 3 Piece Power Reclining Sofa Chaise and susceptibility to pore generation.We compared the use of two different modulations for double-pulse metal inert gas (MIG) welding to reduce the heat input required to generate oscillations in the weld pool.The stabilities of rectangular wave-modulated and trapezoidal wave-modulated double-pulse MIG welding (DP-MIG and TP-MIG) were analyzed by examining their welding processes and weld profiles.We found that the transitional pulse in TP-MIG welding results in smoother current transitions, softer welding arc sounds, and a highly uniform fish-scale pattern.Therefore, TP-MIG welding is more stable than MATTE CLAY DP-MIG welding.

The effects of these double-pulse modulation schemes on welding input energy are presented.We propose methods for reducing welding input energy by varying the number of pulses or the pulse base time of low-energy pulse train while keeping the welding current and welding arc stable and unchanged.Compared to DP-MIG welding, TP-MIG welding reduces the input energy by 12% and produces finer grain sizes, which increases weld hardness.Therefore, TP-MIG welding offers a new approach for heat input control in DP-MIG welding of aluminum alloys.The results of this work are significant for aluminum alloy welding.