Shielded Metal Arc Welding Electrode
A stick electrode is a coated filler rod for manual welding. The coating stabilizes the arc and forms shielding gases and slag that protect the molten metal from oxidation.
Physical-Chemical Mechanism of Action
The stick electrode consists of a bound welding rod surrounded by a coating. During electrolysis, the coating reacts with the atmospheric gas and forms shielding gases like carbon dioxide and hydrogen. These gases protect the molten metal from atmospheric oxidation and simultaneously promote arc stability.
Metallurgical Relevance & Risks in Welding
Without a stable coating, the arc can become unstable, leading to irregular welding processes and possible cracks. Oxidation of the molten metal can lead to porosity and poor joint between the workpieces.
Workshop Practice & Action Instructions
Always use a stick electrode with the correct coating for SMAW. Make sure the coating is not damaged or stripped. If you have arc stability issues, check the integrity of the coating and replace the electrode if needed.