Qualificação de procedimento de soldagem de tubo API 5L X70 revestido internamente com Inconel 625

Abstract

Welding procedure qualifications are activities commonly practiced by manufacturing companies, especially in industries that provide greater responsibility equipment in which the failure of a welded component can cause environmental disasters, accidents involving loss of life, among others. In this context, Welding Engineers daily experience this responsibility. Welding technical documents called WPS (Welding Procedure Specification) and PQR (welding procedure qualification record) are generated after a qualifying work. The first brings all the essential variables, non-essential and supplementary variables (where applicable), with their respective qualified groups, according to the requirements established in project standards; is a step-by-step to use in manufacturing, in order to succeed in welding together the production, such as that achieved during the qualification. The RQPS is a faithful record of those parameters obtained during the pipe welding and is the basis for obtaining the WPS. For evaluation and qualification of the procedure studied in this academic work and to prove the applicability of welding processes and materials adopted herein, the specimens were subjected to a post welding heat treatment (stress relief) and tested by: visual test, radiographic test, hardness test, bend test, charpy, macrograph and micrograph. After obtain satisfactory results in the tests, it was possible the approval and qualification of the welding procedure