Subventions et des contributions :

Subvention ou bourse octroyée s'appliquant à plus d'un exercice financier. (2017-2018 à 2018-2019)

Welded pipeline steels made of 316 or 316L grade stainless steels are widely used in oil and gas industryx000D
mainly for the transportation of very corrosive substances. One of the main challenges in welding of thesex000D
steels is the occurrence of discoloration of the weld region which results often in the rejection of the part.x000D
While the industrial practice is based on AWS D18.2 standard; however, the acceptable level of oxygen is notx000D
identified and often a weld, which might be good, is rejected because of apparent discoloration. In the firstx000D
phase of the project carried out under the Engage Grant a methodology was developed to reveal thex000D
microstructure of the samples welded under different welding conditions. Specifically, the influences of 50 andx000D
500ppm of oxygen content on the discoloration level in comparison with the AWS D18.2 standard wasx000D
assessed and quantified. The microstructure under each specific condition was revealed and examined. Thex000D
mechanical and chemical heterogeneities were also revealed and identified. Based on the results of the firstx000D
phase, the second phase was defined with the objective to further study the influence of surface preparation andx000D
oxygen content for other welding conditions and therefore to widen the scope of the study carried out in thex000D
first phase of the project. It is expected that the results of this project will allow proposing a new criteria forx000D
quantifying the influence of processing conditions on the actual damage to the microstructure.