Weld Notch Factor
The weld notch factor describes the stress concentration at the transition from weld metal to base material. It is critical for fatigue strength and is included in calculations of dynamically loaded components.
Physical-Chemical Mechanism of Action
The weld notch form factor (K) is a measure that quantifies the stress concentration at the transition between the weld metal and the base material. It takes into account the geometric shape and material flow of the weld.
Metallurgical Relevance & Welding Risks
A notch form factor that is too high can lead to increased stress concentration, which impairs the fatigue strength of the components. This can lead to fractures and cracks over time. Conversely, a notch form factor that is too low can result in insufficient stress transfer and thus lead to welding defects such as carbonization or drawing.
Workshop Practice & Action Instructions
To ensure an optimal notch form factor, the following measures should be taken:
• Material selection: Use materials with low stress concentration at the transition.
• Process technology: Set the welding parameters (voltage, speed) to achieve an optimal notch form factor.
• Control and monitoring: Use special measuring devices to check the notch form factor during the welding process.