Capillary Gap Filling Degree
Capillary gap fill ratio is the fraction of the joint cross-section filled with molten solder relative to the total joint area. It affects the mechanical integrity and leak tightness of the braze joint.
Physical-Chemical Mechanism of Action
The capillary gap filling degree describes how well the filler metal penetrates the microscopic gaps of the metal. A high filling degree means that the gap is completely filled with the filler metal.
Metallurgical Relevance & Welding Risks
A low capillary gap filling degree can lead to lack of fusion and porosity. This impairs the mechanical strength and toughness of the brazed joint, increases the risk of cracks, and reduces the sealing capability.
Workshop Practice & Action Instructions
To ensure a high capillary gap filling degree, it is important that the filler metal is well conditioned and has sufficient time to spread into the gaps. This can be achieved by proper heat treatment and a careful brazing procedure.