The objectives of this work were to investigate welding techniques that would insure against base-metal cracks in the heat-affected zones of girth welds.
Cracking tests for evaluating the susceptibility of the heat affected zone (HAZ) to hydrogen cracking during welding often give ambiguous results because cracks occur in the weld metal rather than the HAZ. To solve this problem, a simple bend test…
PRCI and other organizations have funded research and development programs related to weld hydrogen cracking to develop tests, define hardness limits, understand diffusible hydrogen delivery, evaluate hydrogen cracking delay time and define weldment…
The objective of this research was to demonstrate through a laboratory simulation that acoustic emission techniques could be used to detect the occurrence of cracking during the welding of girth joints in gas transmission pipelines.
This study was undertaken on behalf of the National Energy Board to assess the implications for pipeline integrity of accepting cracks in girth welds and fillet welds around the ends of repair sleeves on the basis of an "engineering critical…
Hydrogen cracking has been and continues to be observed in both heat-affected zones and weld metals. High carbon equivalent weldment heat-affected zones (HAZ) combined with rapid cooling have been related to the development of hydrogen cracking…
The thermal contractions of a cooling weld my easily produce average strains of several percent in the weldment. Since hydrogen, which is likely to be present, can embrittle the steel, it is not surprising to find that welds in steel often crack. In…
The vast majority of research on hydrogen induced cracking has been towards heat affected zone cracking. This has resulted in methods for estimating crack sensitivity of steels through carbon equivalent formulae, schemes for predicting safe welding…