Estudo da qualificação de procedimento de soldagem para tubulações de aço ASTM A335 Gr P11 utilizado em centrais termoelétricas

• Autor(a) principal: Santos, Breno Nunes Luiz dos [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155379; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-05-02/000882461.pdf
• topic: Tubulações; Soldagem; Energia elétrica; Usinas termelétricas; Welding

Pipes for superheated steam driving thermoelectric plants require high mechanical strength at high temperatures. In such complex piping systems, the most used form for joining pipes and fittings is welding, and the mostly joints are chamfer with full penetration. The materials most commonly used today for these systems are the ASTM A335 Gr P11 and P22, which contain chromium and molybdenum as an alloying element mechanical strength in temperatures above those which can still be used in carbon steels. In this sense, the present monograph aims to study the qualification of a welding procedure for superheated steam conduction pipes for electric power generation, designed according to the main design code for power pipes, B31.1 - Power Piping, Which establishes that the welded joints are performed by the requirements of the Boiler & Pressure Vessel Code, Section IX (BPVC.IX), both of American Society of Mechanical Engineers (ASME). The welding for the qualification of the studied procedure was done by the Gas Shielded Tungsten Arc Welding (GTAW) and Shielded Metal Arc Welding (SMAW), processes in a full penetration bevel joint in test specimenofsteel tube ASTM A335 Gr P11, with preheating and post weld heat treatment. The performance of the welded joint was verified according to ASME BPVC.IX, by tensile tests, lateral bending and hardness, which presented satisfactory results, that is, the welded joint showed capacity to reproduce the mechanical properties required for the material selected by the project based in stress analysis towards ASME B31.1 code