Discussion
Low hydrogen electrode are baked prior to use in order to:
Answer: C
Low hydrogen electrodes are baked to make welding free from moisture pick up.
Their basic (lime-fluoride) coatings absorb moisture from the air. In the arc, that water breaks down and releases hydrogen into the weld, which can cause hydrogen cracking, the very problem these electrodes are meant to prevent. Baking (typically at a few hundred degrees) drives off the moisture, and the electrodes are then kept in a holding oven until use.
Baking does not set the weld's strength, prevent arc blow (a magnetic effect) or reduce the current needed.
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