← Glossary
Root radius
The root radius is the radius of the transition from the weld to the base metal surface. It reduces stress concentrations and improves load capacity.
Physico-chemical mechanism of action
The root radius enlarges the transition area between the weld and the metal. This minimizes local stresses because the load is distributed over a larger area.
Metallurgical relevance & risks when welding
A root radius that is too small can lead to high local stresses, which can cause cracks and wear problems under load. A radius that is too large can reduce strength and alter the microstructure.
Workshop practice & instructions
For optimal load-bearing capacity, the root radius should be at least 1.5 to 2 mm for processes like MIG or TIG. For joint types like hollow welds, a radius of 3 to 4 mm is recommended.
MetallurgieSchweißtechnik