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O objetivo deste trabalho foi avaliar a ocorrência de trincas a frio quando da soldagem de dutos em operação. Foram executados dois conjuntos de experimentos: o primeiro denominado de experimento "F", em que foi variada a folga entre a calha e o tubo, e utilizados metal de base e de adição de alto carbono equivalente; o segundo denominado de experimento "R", em que foi imposta alta restrição à junta soldada e, promovido o resfriamento rápido mediante fluxo de água no interior do tubo. Foram feitas as soldagens com os seguintes processos e materiais: processo eletrodo revestido (SMAW), tubo e calha em aço ASTM A 335 P5, metal de adição AWS E 8018-B8 (experimento "F"). Processos MIG/MAG pulsado (GMAW-P) e arame tubular auto-protegido (FCAW-S), tubo e calha em aço API 5L X70, metais de adição AWS ER 80S-G e AWS E 71T-11, respectivamente (experimento "R"). Para detectar as trincas a frio foram realizados exame visual e a inspeção com líquidos penetrantes. Adicionalmente as soldas foram avaliadas por macrografia e medição de dureza. Não foram detectadas trincas, apesar da utilização de metais de base e de adição com alto carbono equivalente e da junta com alta restrição, com o objetivo de aumentar as tensões. Admite-se que não houve fissuração devido ao uso de processos e/consumíveis com baixo teor de hidrogênio. The aim of this study was to evaluate the occurence of cold cracks associated with in-service welding of pipelines. Two sets of experiments were performed : the first of them was called experiment "F", where the gap between sleeve and pipe was varied and base and weld metal of high carbon equivalent were used, the second set of experiment was denominated "R", when higher restriction was imposed to the welded joint, which was simultaneously more rapid cooled by water flow within the pipe. The welds were made &#8203;&#8203;with the following procedures and materials: shielded metal arc welding (SMAW) of tube and pipeline steel ASTM A 335 P5, using AWS E 8018-B8 as weld metal (experiment F). Pulsed MIG / MAG (GMAW-P) and self-shielded cored wire (FCAW-S) welding of tube and pipeline steel API 5L X70, by using respectively AWS ER 80S-G and AWS E 71T-11 filler metals (experiment "R "). To detect cold cracks visual and penetrant liquid inspection were performed. Additionally the welds were evaluated by macrography and microhardness measurements. No cracks were detected, despite the use of basic and filler metals of high carbon equivalent and the higher restraint and therefore more stressed joint. It is assumed that the integrity of the welded joints was due to the use of processes and / consumables with low hydrogen content

Soldagem em operação de dutos de alta resistência e baixa espessura com ênfase nas trincas a frio