How to understand the test pieces for welding procedure qualification of heat exchange tubes and tube sheets in 47014-2023 Appendix E?
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Appendix E of the new version 47014-2023 specifies that for the welding procedure qualification tests of heat exchanger tubes and tube sheets, there are fillet weld test pieces, butt weld test pieces, and simulated assemblies. 1: If fillet weld test pieces are used, how should the thickness coverage be calculated? The standard seems to specify only the thickness coverage for butt welds, without mentioning anything regarding fillet welds. 2: If butt weld specimens are used, can the previously conducted process evaluations be applied directly? The welding of heat exchange tubes to tube sheets involves fillet welds; process evaluations that have been done for butt welds can be used for fillet welds regardless of the thickness of those welds. Can the previously conducted process evaluations be applied directly?
Regarding the understanding of the test pieces for welding procedure qualification of heat exchange tubes and tube sheets in Appendix E of the new version 47014-2023: 1. Thickness coverage of fillet welds: If the standard does not specify the thickness coverage for fillet welds, it is usually necessary to refer to similar or relevant standard provisions, or consult relevant technical experts. In practical applications, the appropriate thickness range can be determined based on the characteristics of the welded structure and safety requirements. 2. Use of butt weld test specimens: If the process evaluation for butt welds has been completed previously and the results meet the current welding requirements, they can generally be used directly for fillet welds, provided that the welding method, materials, and operating conditions comply with the new project requirements. However, if there are significant changes in the welding method, materials, or design conditions for the heat exchange tubes and tube sheets, it is recommended to conduct a new process evaluation to ensure welding quality. .