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The fatigue properties of welded components can be improved by means of post-weld treatments, like TIG dressing or hammering. This article describes the results obtained in the research project “DURIMPROVE”, in which the effects of post-weld treatments on welds in high strength steel were investigated.
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This project developed techniques for improving the performance of welded, high-strength steels (yield strengths of 700 and 960 MPa) at thicknesses of 5-20 mm, for use in fatigue-loaded, welded structures, e.g., construction equipment, transportation vehicles and lifting devices. High frequency impact peening, weld toe laser dressing and low transformation temperature filler material were examined. Experimental and analytical procedures assessed the benefits and limitations of the selected methods. Full-scale testing demonstrated industrial viability and cost benefits. Practical implementation guidelines and design recommendations were disseminated.
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