Wella Weldability Index
The wella weldability index indicates how well a steel can be welded and its formability and resistance to cracking during welding. It helps select the suitable material for specific applications.
Physical-Chemical Mechanism
Welda's Weldability Index (WSK) measures the deformability and crack resistance of a steel under welding stresses. It considers both the chemical composition and the mechanical properties of the material.
Metallurgical Relevance & Welding Risks
A low WSK value indicates low deformability and higher crack resistance. This can lead to hot cracks, fractures, or insufficient weld strength. A high WSK value, on the other hand, means the steel is highly deformable and less prone to cracking.
Shop Practice & Actions
When selecting a steel for a weld, keep an eye on the WSK value. A steel with a WSK of at least 1.5 is suitable in most cases. For particularly high stresses or critical applications, a higher value (e.g., above 2.0) may be required. Make sure the steel doesn't cool down too fast during the welding process to avoid cracks.