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In 1990, insurance companies in Sweden changed their instructions for hot work' and special education was required for operators as well as fire watches. The term hot works refers to welding, cutting, brazing, drying or heating with a flame or hot air, working using an abrasive wheel and all other work that creates open flames, hot surfaces or sparks. Safety regulations have been written in Sweden...
In this paper, three cases of small diameter pipe weld fatigue failures are described. Kansai implemented repair work and undertook a detailed investigation of the causes of the failures. They showed that for one of the pipes, the crack cause was due to the starting of a fatigue crack at the incomplete penetration of the socket weld joint root. It propagated due to small vibrations during the operation...
Fatigue tests are carried out on a servo-hydraulic machine under 0.1 stress ratio on butt welded joints made of S550MC high strength steel. The microstructural influence is shown by the presence of strong breaking-downs for the crack growth rate due to microstructural barriers. The crack initiation takes place when the signal of the most affected strain gauge changes by 3%. It corresponds to a...