Nagrzewanie materiałów przed spawaniem jest stosowane w przypadku elementów wykonanych ze stopów trudno spawalnych, lub elementów w których podczas spawania mogłyby wystąpić znaczne naprężenia mechaniczne powstałe w skutek nierównomiernego rozkładu temperatury. Spoiny wykonane w elementach, które były wstępnie podgrzewane, w badaniach defektoskopowych wykazują znacznie większą trwałość i odporność na pęknięcia.
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