Weld Toe Radius
The transition radius between the reinforcement and the base metal. A larger radius reduces stress peaks and improves mechanical strength.
Physical-Chemical Action Mechanism
The weld reinforcement radius is the area where the weld structure differs from the base metal. A larger radius means stresses in the transition zone drop off more gradually, so there are fewer local stress peaks.
Metallurgical Relevance & Welding Risks
A too-small weld reinforcement radius can cause high local stress peaks that may lead to cracks or deformations in the material. This raises the risk of hot cracking and cuts the mechanical strength of the weld.
Shop Practice & Action Guidelines
To get an optimal weld reinforcement radius, careful joint prep and proper welding parameters are key. For stiff steels (like HSS), the radius should be at least 2 mm. For softer steels, a smaller radius of 1.5 mm may be enough. Stress peaks can be reduced by careful cooling and using suitable welding methods.