How does the choice of welding technique affect the residual stress distribution in welded joints?
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For a large welded steel vessel the following data are available: service stress σ = 200 N/mm² yield strength weld metal σys = 450 N/mm² Young's modulus weld metal E = 205 000 N/mm² Due to shrinkage after the welding process, residual stresses develop in the weld seam which can be as high as the yield strength of the weld metal. By means of a heat treatment these stresses can be reduced. It is required that the vessel can withstand a crack in the weld metal with half crack size a = 60 mm. Furthermore the CTOD value in this case may not exceed 0.5 mm. To what level should the residual stresses be reduced to comply with these requirements?
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