Pickling paste for welds
Welding auxiliary agents: Pickling paste is a chemical aid used to remove heat tint and oxide layers from welds on high-alloy steels after joining. It improves surface cleanliness and prevents corrosion.
Physical-Chemical Mechanism of Action
Welding aids pickling paste contain chemical additives that dissolve discoloration and oxide layers on the surface. These substances react with metal ions and form soluble compounds that can be washed off easily.
Metallurgical Relevance & Risks in Welding
A clean surface is critical for a high-quality weld. Oxide layers can cause corrosion and impair joint strength. Pickling paste ensures that metal surfaces are clean before welding, leading to a stronger and more durable joining process.
Workshop Practice & Instructions
Use pickling paste as follows: Apply the chosen welding aid to the metal surfaces, let it soften for 1-2 minutes, then rinse thoroughly. Make sure no residue of the agent remains on the surfaces, as this can lead to corrosion.