Experimental methods of hydrogen testing to prevent Hydrogen Assisted Cracking (HAC) during the Submerged Arc Welding (SAW) process
Summary :
Table of Contents
- Abstract of the study
- Introduction
- Idetification: Visual appreance of hydrogen cracking
- Definitation of Metallography
- Factors that cause hydrogen cracking
- Main factors that influence the risk of cracking
- Methods of hydrogen testing
- Conclusion
- Reference
Abstract
One of the main problems associated with the welding of ferritic steels is that of hydrogen assisted
cracking (hac), popularly known as cold cracking or delayed cracking. As the name suggests, it is
caused by hydrogen present in the weld metal. One of the methods to mitigate this type of cracking is to
control and minimize the amount of diffusible hydrogen content in the welds. This in turn calls for
standard test methods to measure diffusible hydrogen present in weldments made with different welding
consumables, processes etc. The methods employed to measure hydrogen vary from simple manometer to
sophisticated mass spectrometers and sensors. The present volume of this paper highlights identification, causes and factors responsible for hydrogen cracking. Each factor influencing the risk of hydrogen cracking is described in detail with clear figures and mathematical formulation. Different methods of measurement of diffusible hydrogen and methods of hydrogen testing are also covered. The paper explains the welding procedure of hydrogen testing using saw (submerged arc welding) process. T
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