Leg length of fillet weld
The leg length of a fillet weld is the distance from the weld root to the outer edge of the weld transition on the part surface. It defines the geometric extent of the fillet weld on the joined parts.
Physico-chemical mechanism of action
The leg length of the fillet weld refers to the area where the metal is deformed and reshaped during the welding process. This area is critical for the development of the microstructure and the mechanical properties of the weld.
Metallurgical relevance & risks during welding
A leg length that is too short can cause the metal not to be deformed sufficiently to produce a homogeneous fillet weld. This can lead to insufficient toughness and increased stress corrosion in the weld area. A leg length that is too long, on the other hand, can lead to over-deformation and possible cracks at the joint partner.
Workshop practice & instructions
The leg length should be selected so that it meets the requirements of the component and the welding processes. For many types of steel, the optimal leg length is typically 1 to 2 times the thickness of the joint partner. It is important to consider the leg length during planning and execution of the welding process to ensure a safe and stable weld.