Effect of weld superpulse time on the microstructural evolution of a low carbon steels

Unlike standard pulse welding, the Super Pulse uses a sequence of different pulse waveforms to create a cord shape and appearance similar to the GTAW process. It uses higher amperage in the primary phase to improve penetration and low amperage in the second phase to reduce the heat input.

Spray transfer is used in the primary phase to improve penetration and short arc in the secondary phase to cool the solder bath giving less heat transfer and less distortion to the base material. In the literature there is little information regarding the relationship between the Super Pulse variables and the microstructural characteristics of the deposited metal. The objective of this work was to evaluate the influence of the times of each phase in Super Pulse mode, on the geometric characteristics of the cord and the solidification in weld deposits of low carbon steels.