W48.7-M1977

1. Scope 1.1 The purpose of this Standard is to provide a test method for measuring the content of diffusible hydrogen in deposited weld metal. Note: In order to obtain the total hydrogen content, it would be necessary to obtain the residual content by hot extraction at 650°C under vacuum or using a carrier gas method. 1.2 This assessment shall be made at the time of qualification of any welding processes under the pertinent CSA electrode standard for any electrode classification so designated by the manufacturer.