Magnetic Flux Density
Magnetic flux density indicates how strong the magnetic field is at a given point. It influences leakage field formation and the sensitivity of magnetic particle testing.
Physicochemical Mechanism of Action
Magnetic flux density (B) describes the density of magnetic field lines in a material. It is proportional to the product of the magnetic field strength (H) and the magnetic permeability (μ). In ferromagnetic materials like steel, the flux density is greatly increased when the material is magnetized.
Metallurgical Relevance & Risks in Welding
Too high a magnetic flux density can lead to increased stray flux formation, which increases the sensitivity of magnetic particle inspection. This can cause errors in crack detection, as the test zone may become oversensitive and minor variations may be interpreted as cracks.
Shop Practice & Action Instructions
When welding ferromagnetic materials, it is important to control the magnetic flux density. This can be achieved by selecting the right welding process and proper cooling technique. In high-performance laser welding or high-frequency welding, special attention must be paid to uniform cooling to minimize the magnetic flux density and reduce stray flux formation.