Submerged arc welding flux
Welding flux covers the arc in submerged arc welding and controls the alloy composition of the weld metal through its metallurgical reactivity. It also protects the molten pool from contamination.
Physical-Chemical Mechanism
Welding flux is thrown onto the arc in the form of fine particles and covers it completely. These particles react with the molten pool, affect its composition, and can cause chemical reactions that control metal behavior.
Metallurgical Relevance & Welding Risks
Choosing the right welding flux is crucial for a homogeneous alloy and a good weld. Wrong flux types can cause contamination, which dirties the metal and hurts its properties. Also, missing or excessive flux coverage can mess with the arc's permeability and lead to uneven welding.
Workshop Practice & Procedures
Pick the right flux based on the metal you're welding. Make sure the flux is fine and homogeneous. Use enough to fully cover the arc, but avoid overdoing it, which can cause contamination. Usually, you need between 0.5 and 1 g per square cm of weld area.