A New Model for Hydrogen Absorption in Welds
Abstract
A systematic review of previous research has shown that the use of Sievert's law to calculate the hydrogen absorption reaction temperature in the weld pool is invalid. A new model of hydrogen absorption is proposed which can explain both previously measured data and the data obtained in this study. The hydrogen content measured in a diffusible hydrogen test will be governed by three distinctly different phenomena: (1) hydrogen absorption into the molten pool, (2) hydrogen trapping or rejection from the solidification front, and (3) hydrogen diffusion away from the solidified weld. These are separate occurrences which must be separately modelled in order to obtain a complete understanding of the hydrogen remaining in the weld. This study has separated out these varios effects in order to determine the amount of hydrogen initially absorbed. Once this value is known, a new model can be developed in order to gain a greater understanding of the basic gas metal reaction occuring in the weld pool, and how it is affected by the welding arc. (AW)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1989
- Accession Number
- ADA216951
Entities
People
- Steven A. Gedeon
- Thomas W. Egar