Throat thickness
The fillet weld throat is the minimum height of the triangle drawn from the weld root to the edge of the fillet. It indicates how deep the weld penetrates into the material and influences the mechanical strength.
Physico-chemical Mechanism of Action
The fillet weld throat is a measure of the depth of the weld into the material. It is determined by measuring the distance between the weld root and the deepest point of the fillet edge.
Metallurgical Relevance & Welding Risks
An overly thin fillet weld throat can lead to brittleness and cracks because the material is not sufficiently strong. An overly thick throat increases stresses in the material and may lead to hot cracks or distortion.
Workshop Practice & Instructions
The fillet weld throat should be between 0.5 mm and 1.0 mm, depending on the material and application. For heavily loaded components, a thin throat (approx. 0.5 mm) is preferred to increase mechanical strength. For low loads, a thicker throat (approx. 1.0 mm) can be used to reduce stresses.