Capillary Gap Venting
Capillary gap deaeration removes air from the solder gap to avoid gas entrapment and ensure a clean joint.
Physico-chemical mechanism of action
The air in the solder gap is drawn into the molten filler metal by the capillary action of the gap. This can lead to gas inclusions and impair the strength of the joint.
Metallurgical relevance & risks during welding
Gas inclusions in the solder gap can cause cracks, weak spots, and reduced toughness of the weld metal. This can affect the service life and reliability of the components.
Workshop practice & instructions
Before the soldering process, the gap must be carefully cleaned to ensure that no trapped air remains. This can be achieved by using deaerating agents or by mechanical cleaning. The temperature of the solder gap should be set so that the molten filler metal flows quickly and sufficiently, preventing air from being drawn into the gap.