4. Measurement of gassing level and hydrogen content in metal
Measuring the amount of hydrogen in aluminum alloys is very difficult because of the very low levels involved. There are two main classes of methods used in industry:
laboratory methods for expert assessments of solid samples;
workshop methods for measuring liquid metal.
![Ransley vacuum extraction method (after [9])](/en/document/media/content/en/article/m218/1/m218i3)
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Measurement of gassing level and hydrogen content in metal
Parameters controlling gassing porosity on castings
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