Abstract
The influence of the hydrogen effect during welding of great thicknesses of steels induced into welded joints particularly by moisture contained in the filler material used, is followed up in this paper. The results are compared with the effect of hydrogen induced into the weld metal by controlled cathodic hydrogenization, i. e. by simulation of service conditions. The development of cracks was observed by their propagation in both the undercladding area and surface weld deposit. In the paper the dependence of the crack propagation rate on the stress intensity factor range is expressed. It was found that even if the effect of metallurgically induced hydrogen has no unfavourable consequences on mechanical properties, it is necessary to minimize the hydrogen content in weld metal and avoid subcladding initiations and crack formation and protective cladding overlay reduction. Undercladding initiations and surface defects are the intercepting spots for the hydrogen diffusion, where damaging or substantial reduction of cohesive strength between grains appears.
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