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Hydrogen has a detrimental effect on the mechanical properties and mechanical behavior of steels.1–4) It is known and accepted that increasing the strength of steels also increases the susceptibility to hydrogen induced cracking (HIC).5–7) In particular, it is known that the microstructure and hardness of the heat affected zone (HAZ) of steel welds have a great influence on HIC. For example, the martensite formation is related to this phenomenon,8–10) so to avoid or mitigate HIC, materials are selected and/or the welding process is designed to inhibit the formation of this microconstituent. In recent years, great interest has been taken in the effect of hydrogen on the properties and mechanical behavior of microalloyed steels intended for the oil industry.11,12) This is because there may be presence of H2S during the exploitation, processing and/or transport of hydrocarbons; thus through corrosion reactions, hydrogen ions can be produced, Hydrogen Diffusivity in the Welding Zone of Two High Strength Experimental Microalloyed Steels