← Glossary

Low-hydrogen welding flux

A specially dried or manufactured SAW flux exhibiting extremely low levels of moisture-bearing constituents to prevent hydrogen-induced cracking in high-strength steel. It often requires re-drying prior to use.

Low-hydrogen powder has hardly any moisture left in it. The point is simple: moisture releases hydrogen during welding, and that migrates into the steel. Especially with high-strength materials, hydrogen then causes stress cracks, which you don't want. That's why you have to store the powder dry and often re-dry it before use, depending on the manufacturer's instructions. If the powder has absorbed moisture, you'll burn yourself into a mess and damage the weld too. So: keep the powder dry, then it's all good.

MetallurgieSchweißtechnik

AI Transparency (EU AI Act): Created on the basis of our own many years of practical experience in welding technology, with the help of AI, and reviewed editorially.

© 2026 Welder-World. All content is for training and continuing education and does not replace a certified welding procedure specification.