Capillary Gap Filling
Capillary action draws liquid solder into narrow joint gaps, ensuring a complete and strong bond.
Physical-Chemical Mechanism of Action
Capillary action is a physical phenomenon where liquid solder is drawn into narrow gaps due to its surface tension. This happens regardless of gravity and is influenced by the microscopic structure of the material.
Metallurgical Relevance & Welding Risks
Capillary gap filling is crucial for a high-quality weld. It ensures that the solder completely penetrates the gaps, leaving no voids or porosity. A lack of gap filling can lead to weak spots and cracks that impair the strength of the joint.
Workshop Practice & Action Instructions
To ensure optimal capillary gap filling, it is important that the solder remains liquid and the joint gaps are narrow. This requires the correct welding temperature and sufficient time for gap filling. In highly conductive metals or under high stresses, capillary action may be impaired, leading to porosity.