Mechanical descaling
Mechanical descaling is the breaking up and removal of brittle oxide layers by mechanical processes such as bending, blasting, or brushing. It prepares the metal for forming or coating.
Physical-Chemical Mechanism of Action
Mechanical descaling breaks down oxide layers through mechanical force and movement. The brittle oxides are broken into microscopic particles by bending, blasting, or brushing and then removed.
Metallurgical Relevance & Risks in Welding
Inadequate mechanical descaling can result in poor weld surfaces, leading to weak joints. This increases the risk of cracks and reduces strength. Excessive descaling can damage the metal or contaminate its surface.
Workshop Practice & Handling Instructions
Use brushes with hard ceramic or steel bristles for heavily oxidized surfaces. Blasting and mechanical tools like vibratory brushes are more effective for light oxides. Make sure the metal is clean after descaling, with no residue of dirt or contaminants.