Abstract
High-strength structural steels with yield strengths up to 1 100 MPa are used in various industrial sectors such as for the construction of cranes, pipelines and offshore structures. However, with increasing strength Cthe ductility and deformation capacities of these materials are reduced and thus, they show an enhanced sensitivity against degradation due to hydrogen with increasing yield strength. It means they become susceptible to hydrogen-assisted cold cracking (HACC) during fabrication welding. In order to avoid such defects, Qthe existing standards recommend preheating and/or interpass temperature, as well as post heat treatments, However, the standards relate only to steels with a maximum yield strength of Rp.0.2 = 960 MPa. Hence, in welding these high-strength structural steels with yield strengths up to 1 100 MPa, it is very important to have practical guidelines for determining suitable heat treatment procedures to avoid HACC in welds, in particular in safety-relevant components. As a contribution to the further establishment of sufficient Hydrogen-Removal Heat Treatments (HRHT), two dimensional numerical models of butt and lap joints of various thicknesses were developed. Hydrogen diffusion and the effect of different post heat treatments upon hydrogen reduction in high-strength structural steel were studied. It turned out that the hydrogen diffusion behaviour in the lap and the butt joints are quite different and that the hydrogen concentration in the lap joint can be reduced significantly faster in comparison to the butt joint.
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Mente, T., Boellinghaus, T. & Schmitz-niederau, M. Heat treatment Effects on The Reduction of Hydrogen in Multi-Layer High-Strength Weld Joints. Weld World 56, 26–36 (2012). https://doi.org/10.1007/BF03321362
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DOI: https://doi.org/10.1007/BF03321362