Is it necessary to conduct a new weld assessment when changing the weld pattern in heat exchanger tube sheet welding?
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For the post-expansion tube fitting of the deep-hole fillet welds between the heat exchange tubes and the tube sheet, can the additional evaluation method for conventionally qualified protruding weld fillet welds be used?
Changing the weld pattern in heat exchanger tube sheet welding usually requires re-evaluating the welding procedure specification (WPS/PQR), as different weld patterns can affect welding performance. For the welding of heat exchange tubes to tube sheets, if the same materials, welding processes, and operating conditions are used and only the welding sequence is changed (i.e., welding first followed by tube expansion) without altering the weld configuration, then the previously approved welding procedures can be referenced. However, if the weld pattern or other important welding parameters change, a new welding procedure qualification is required. It is best to consult relevant welding standards and technical specifications, or seek the advice of quality supervision agencies. .