Experimental method of hydrogen testing to prevent hydrogen assisted cracking (hac) during submerged arc welding (saw) process
Summary :
Table of Contents
- Abstract
- Introduction
- Indentification - Visual appearanceof hydrogen cracking
- Metallography
- Possile causes
- Main factors which influence the risk of cracking
- Weld metal hydrogen content
- Parent material composition
- Parent material thickness
- Stresses acting on the weld
- Heat input
- Measurement of diffusible hydrogen
- Preparation of weld specimen, cleaning and storage and measurement
- Methods of hydrogen testing
- Saw process
- Procedure of hydrogen testing
- Conclusion
- Bibliography
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 weld-ments 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.
Keywords: hydrogen testing, hydrogen assisted cracking (hac), submerged arc welding (saw) process, diffusible hydrogen
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