Capillary Gap Constriction
Capillary gap narrowing blocks the flow path of the solder due to dimensional deviations or thermal distortion, leading to incomplete braze joints.
Physico-chemical mechanism of action
Capillary gap narrowing occurs when the flow path for the molten solder becomes too tight due to dimensional deviations or thermal distortions. The solder can no longer flow completely through the gap, resulting in incomplete braze joints.
Metallurgical relevance & risks when welding
This narrowing leads to missing or poor braze joints that may fail under mechanical load. This can result in cracks, leaks, or functional failure of the component.
Workshop practice & instructions
To avoid capillary gap narrowing, ensure precise dimensions and minimize thermal distortions. Make sure the brazing surfaces are clean and the solder is not overstrained. For complex components, fine adjustment or a different joining technique may be required.