DIN EN ISO 3690:2012-07

This standard specifies the sampling and analytical procedure for the determination of diffusible hydrogen in martensitic, bainitic, and ferritic steel weld metal arising from the welding of such steels using arc welding processes with filler metal. The techniques specified in this standard include collection of diffusible hydrogen via displacement of mercury or collection into a headspace filled with an inert gas such as argon. In the first case, the amount of hydrogen collected is determined by measuring the displaced volume; in the second case, by measuring the thermal conductivity. The International Standard ISO 3690:2012 has been prepared by the International Institute of Welding (IIW) and has been identically adopted as a European Standard. The responsible German standardization committee is Joint Working Committee NA 092-00-05 GA "NAS/NMP: Zerstörende Prüfung von Schweißverbindungen (DVS AG Q 4)" ("NAS/NMP: Destructive tests of welds (DVS AG Q 4)") at NAS.