scope:

This Standard specifies the procedure for the determination of diffusible hydrogen, measured by the gas chromatography method or hot carrier gas extraction method, in steel weld metal arising from the welding of such steels using arc welding processes.

The welding processes covered in this Standard are shielded metal arc welding, submerged arc welding, gas-shielded metal arc welding (hereafter referred to as gas-shielded arc welding) and self-shielded arc welding.

NOTE 1 Diffusible hydrogen content is used as one of the factors in calculating the preheating temperature to prevent cold cracking of the weld or the properties of the welding material.

The calculation of the preheating temperature is carried out by converting the diffusible hydrogen content per mass of deposited metal calculated in 6.2 by the relational formula given in Annex JC.

NOTE 2 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 3690 : 2018 Welding and allied processes - Determination of hydrogen content in arc weld metal (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.