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Acceptance level for planar flaws in fusion welds depends on the conditions of welds due to residual stresses
Vuherer, Tomaž
Load carrying capacity of welded structures depends mainly on the strength of the joints. The main reasons are flaws that arre almost always present and the material embrittlement in the fusion weld ...joints made in the workshop conditions. The acceptance level for planar flaws in fusion welds depends on the level of residual stresses that is on the weld joints conditions. The influences of the some methods on the final conditions of weld joints regarding the level of residual stresses were experimentaly studied. Different mechanical and thermal treatments and their combinations were applied (VSR, PWHT). Surface residual stresses were measured on the prepared test pannels by using hole drilling method. High strength structural stell was used for the experimental work. The weld joints were made by SAW and T.I.M.E. welding processes. The highest values of residual stresses were obtained in the weld material and HAZ where the possibility of planar flaws is also the highest. VSR during welding reduced the level of longitudinal residual stresses for 15%. PHWT reduced the levels of longitudinal and transverse residual stresses up to 60%. PHWT is more efficient than mechanical treatments.
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