The connection between the pin of solid aluminum electrolytic capacitor and aluminum foil is usually realized by welding. The connection method is as follows:

1. First, make sure that the surfaces of lead and aluminum foil are clean and free of oil or oxide.

2. Align and approach the pin with the surface of aluminum foil to ensure good contact between the pin and aluminum foil.

3. Use welding tools (such as solder) to weld the lead and aluminum foil. When welding, it is necessary to melt the solder and smear it on the contact point between the lead and the aluminum foil to make it firmly connected.

4, after the completion of welding, ensure good quality of solder joints, no loose or poor contact.