This International Standard specifies the sampling and analytical procedure for the determination of diffusible and residual hydrogen in ferritic weld metal arising from the welding of ferritic steel using arc welding processes with filler metal. Collection of the hydrogen over mercury is the primary method. Provided that the weld specimen size is maintained within limits dictated by the size of the test block, variations in welding parameters are permissible in order to investigate the effect of such variables on the weld hydrogen content. The techniques described in this International Standard constitute a reference method which should be used in cases of dispute.
ISO 3690:2000 history
2018ISO 3690:2018 Welding and allied processes - Determination of hydrogen content in arc weld metal
2012ISO 3690:2012 Welding and allied processes - Determination of hydrogen content in arc weld metal
2000ISO 3690:2000 Welding and allied processes - Determination of hydrogen content in ferritic steel arc weld metal
1983ISO 3690:1977/Add 2:1983 Welding; determination of hydrogen in deposited weld metal arising from the use of covered electrodes for welding mild and low alloy steels; addendum 2
1970ISO 3690:1977/Cor 1:1983 Technical Corrigendum 1 for Determination of Diffusible Hydrogen in Welded Deposited Metals of Welded Carbon and Low Alloy Steels by Manual Welding
1977ISO 3690:1977 Welding; Determination of hydrogen in deposited weld metal arising from the use of covered electrodes for welding mild and low alloy steels