Residual stresses in repair welds of high-strength low-alloy steels

R Schasse, T Kannengiesser, A Kromm, T Mente - Welding in the World, 2015 - Springer
R Schasse, T Kannengiesser, A Kromm, T Mente
Welding in the World, 2015Springer
Residual stresses are often the cause for cracks in weld constructions. That is why the
residual stress level, induced by manufacturing process, plays a crucial role. The present
study aims on the effect of multiple repair weld procedures on a high-strength structural steel
S690QL. The widespread technology of carbon arc-air gouging was applied. The weld zone
and the heat-affected zone (HAZ) were subjected to multiple thermal cycles by gouging and
subsequent repair welding. The investigations were focused on the change of the residuals …
Abstract
Residual stresses are often the cause for cracks in weld constructions. That is why the residual stress level, induced by manufacturing process, plays a crucial role. The present study aims on the effect of multiple repair weld procedures on a high-strength structural steel S690QL. The widespread technology of carbon arc-air gouging was applied. The weld zone and the heat-affected zone (HAZ) were subjected to multiple thermal cycles by gouging and subsequent repair welding. The investigations were focused on the change of the residuals stresses, the impact on the microstructure and the changes for the mechanical properties of the repair welded joint. The residual stresses were determined by X-ray diffraction. The results have shown a significant dependence for the residual stress levels from the repair cycle. In addition, distinctive changes in microstructures and hence mechanical properties occurred. The fusion line of the repair weld and the adjacent HAZ are the most critical areas. This is where the loss of ductility is most pronounced.
Springer
以上显示的是最相近的搜索结果。 查看全部搜索结果