Abstract

In arc welding processes, heat input is a measure of the energy that is supplied to the workpiece to produce the molten weld puddle. Heat input is generally calculated by taking the arc energy (volts × amperage) divided by the electrode linear travel speed. The units are typically (kJ/cm or kJ/inch). The effect of electrode weaving or oscillating transverse to the forward linear travel speed can be difficult to account for in the heat input calculation. The ASME Section IX committee is considering addition of a new essential variable to account for this effect of weaving on heat input. This has been proposed due to the potential for employing a wide weave and calculating heat input using the forward advancement of the weld bead as the travel speed, which could result in excessive heat input. The concern is a procedure qualification record (PQR) qualified with a high heat input and a wide weave could be used to support a Welding Procedure Specification (WPS) that permits utilization of the same heat input with stringer beads. This paper includes a literature study and heat input measurements for stringer and weave beads, demonstrating that introducing this new variable is not urgently required, lacks technical basis, and may even be unsuitable.

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