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Research was carried out the aim of which was to determine the optimum parameters in wet underwater welding with the MMAW and self-shielding flux-cored arc welding that minimize the appearance of cold cracks with the employment of the Implant test. Welding was carried out at three levels of heat input, of 12, 15 and 18 kJ/cm, for each level the amount of diffusible hydrogen and critical Implant stress being determined. In addition, hardness tests in the welded joint and HAZ were carried out, as well as a microstructure analysis. Finally, conclusions about the risk of the occurrence of cold cracks in the wet underwater welding of API 5L X70 steel were drawn.
underwater welding; implant test; cold cracks
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