In Process Measurement of Hydrogen In Welding

The deleterious effects of atomic, or diffusible, hydrogen dissolved in welds on their mechanical properties have been known for over four decades. However, post weld inspection and repair of hydrogen induced cracks in welds remains the only means of correcting the defects produced by excess hydrogen in the arc atmosphere during welding. In this study, a spectroscopic technique for measuring the amount of hydrogen in the arc atmosphere during welding is presented. A relationship between the amount of hydrogen present in the weld arc atmosphere during welding and the diffusible hydrogen content of the resulting weld is developed. The results of mechanical tests are used to determine the hydrogen induced cracking susceptibility of an armor steel. The amount of hydrogen present in the arc atmosphere during welding is correlated with the mechanical properties of the weld. Methods for applying this work to real time detection of conditions likely to produce hydrogen induced cracking of production welds, and thereby reduce the amount of nondestructive inspection and weld repair required later, are suggested.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• White, Dawn Roberta

• Engineering, Mechanical

Identifier

(UMI)AAI8701653

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/70141