1. For serious damp, peeling off the skin, should be scrapped.
2. Damp but not very serious can be dry again. The welding quality is basically guaranteed if the phenomenon of the peeling off of the bulk drug and the porosity of the weld surface are not found.
3. All kinds of electrodes if only the solder core appears slightly rusty, according to the results of many tests, basically can also ensure the quality of welding, but for important works of cobalt base electrode, rust should be degraded after use.