![]() ![]() The terms applied are presented in Table 2. Pursuant to the ISO/TR 18491 report, formulae A, B, and C are used to calculate arc energy. Voltage measurement points for various welding processes in accordance with the ISO/TR 18491 guidelines Formulae for calculating arc energy Table 1 presents the recommended measurement points for various welding processes. This way, voltage losses caused by welding cables can be eliminated. The new welding procedure test standard refers to the technical reports for ISO/TR 1841-1, which state that arc voltage must be measured as close to the arc as possible. Users can use heat input or arc energy in the monitoring of welds, to be calculated in accordance with ISO/TR 18491.” In the past, these were regarded as alternative terms for the same quantity, but they are now calculated via different formulae. “Arc energy and heat input both indicate the heat that arises as a result of the welding arc. The calculation (of either heat input or arc energy) must be documented.” The k factor pursuant to ISO/TR 17671‑1 must be taken into account in the calculation of heat input. Arc energy must be calculated in accordance with ISO/TR 18491. “Users can use either heat input or arc energy (J/mm). Section 8.4.7 of the EN-ISO 15614-1:2017 standard, titled “Heat input (arc energy)”, states the following for the new welding test procedure: In concrete terms, what does this mean for MIG/MAG welding? And how can workshops carry out these calculations in practice? The requirements set by the standards The new welding procedure test standard, EN-ISO 15614-1:2017, provides recommendations for the measurement and calculation of heat input. ![]() This post is also available in: Suomi Deutsch polski ![]()
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