Electrode coating
Electrode covering is a layer on stick electrodes that releases shielding gas and alloying elements during burning. It stabilizes the arc and protects the weld pool from air contact.
Physical-Chemical Mechanism of Action
The electrode covering consists of a mixture of carbon, silicon, and other metals. During burning, it reacts with the air and releases shielding gases like CO2 and CO. It also protects the weld pool from oxidation and prevents porosity.
Metallurgical Relevance & Risks in Welding
A missing or defective electrode covering can lead to air contact in the weld pool, causing porosity and sulfur formation. This increases the risk of cracks and reduces the strength of the weld.
Shop Practice & Instructions
Ensure that the electrodes are properly covered and have no gaps or damage. Regularly inspect the covering and replace it if there are signs of wear or damage.