Compression test
A compression test examines the deformation and fracture behavior of materials under pressure. It is often used for brittle materials such as cast iron to analyze their mechanical properties.
Physical-Chemical Mechanism of Action
A compression test involves applying compressive forces to a test specimen. This leads to deformation of the material, with stress and strain being measured. The process shows how the material reacts under pressure and whether it is brittle or tough.
Metallurgical Relevance & Risks in Welding
For brittle materials like cast iron, a compression test can help minimize the risk of cracks and fractures. Incorrect handling or insufficient testing can lead to failed weld joints that are not adequately mechanical.
Workshop Practice & Instructions
For a compression test, a special machine stand is used. The test specimen is compressed into a cylindrical shape while stress and strain are continuously measured. The maximum stress the material withstands indicates how robust it is. For cast iron, the maximum stress should be at least 300 MPa to ensure a safe weld seam.