Root opening
Gap width is the distance between the edges of the joint partners before welding. It determines how much filler material can penetrate and prevents blockages.
Physical-chemical mechanism of action
The gap width influences the penetration of the filler material into the joint. A too small gap width can lead to blockages, while a too wide gap can cause loss of filler material.
Metallurgical relevance & risks in welding
A too small gap width can cause the filler material not to fully penetrate, leading to incomplete fusion and possible cracks. Conversely, a too wide gap can cause loss of filler material or insufficient weld density.
Workshop practice & instructions
The optimal gap width is usually between 0.5 and 1 mm. For heavy metals or high stress cases, the gap width can be slightly larger. Make sure the edges are straight and smooth to ensure homogeneous penetration.