An evaluation of rapid methods for diffusible weld hydrogen

An evaluation has been carried out of rapid methods for measuring diffusible weld hydrogen, and the results have been compared with those of the primary room temperature mercury method. Different analytical techniques have been studied looking at extraction temperatures of up to 400 degrees C (752 degrees F), while a range of consumable types for shielded metal are (SMA), flux cored are (FCA) and submerged are welding (SAW) deposits was included. With the exception of welds containing porosity, satisfactory agreement with the primary method was obtained at temperatures up to 400 degrees C, provided appropriate care was taken. Analysis times were markedly reduced from 14 to 21 days at 20 degrees C (68 degrees F) to similar to 30 min at 400 degrees C.