Fatigue Limit
The endurance limit is the maximum number of load cycles that a material can withstand without failure. It indicates the limit for infinite life.
Physical-Chemical Mechanism of Action
Fatigue strength describes the maximum stress fluctuation that a material can withstand through countless load cycles without developing plastic deformation or cracks. This limit depends on the microscopic structure and mechanical properties of the material.
Metallurgical Relevance & Risks in Welding
A material with low fatigue strength can quickly crack or deform under frequent load cycles. This leads to a shortened service life and potential failure under load. During welding, it is crucial that the microstructure remains stable and no microscopic cracks form that could lead to fracture under load cycling.
Workshop Practice & Instructions
To increase the fatigue strength of a material, careful welding is essential. This includes:
• Proper pre-treatment of the material before welding
• Use of suitable welding methods and parameters
• Careful cooling to avoid microscopic cracks
• Post-weld inspection of the mechanical properties of the joined material