1. The welding surface must be kept clean
Even for weldable components, due to long-term storage and contamination, harmful oxide films, oil stains, etc. may form on the surface of the components. So, before implementing welding, it is necessary to clean the surface, otherwise it is difficult to ensure quality.

2. During welding, the temperature and time should be appropriate, and the heating should be uniform

At a sufficiently high temperature, the solder can be fully wetted and diffuse to form an alloy layer. Excessive temperature is not conducive to welding. Welding time has a significant impact on the wettability of solder and soldered components, as well as the formation of the bonding layer. Accurately grasping the welding time is the key to high-quality welding.

3. Welding points should have sufficient mechanical strength

4. Welding must be reliable to ensure conductivity

In short, high-quality solder joints should be bright and smooth; The solder layer is uniform, thin, and moist, with a suitable proportion to the size of the solder pad, and the contour of the joint is faintly visible; Sufficient solder, scattered in a skirt shape; No cracks, pinholes, or solder residue. The appearance of a typical solder joint is shown in Figure 8, where the height of the "skirt" shape is approximately 1 to I.2 times the radius of the solder pad.