There Are Three Adverse Effects of LED Solder

There are three adverse effects of LED welds: 2018-01-25: 333 The stele effect is different due to the different amount of total paste, due to the effect of thermal expansion and contraction during the welding process. The tensile force generated by more solder joints is large, and the amount of solder with less volume is less tensile. The tensile force generated by the large amount of welding joints is sufficient to pull the welded joints with less volume, or the phenomenon of de -welding, or because of the cooling speed of the cooling speed, or because of the cooling speed, Unexpectedly, the hot welded joints that appeared have not been cooled, the contraction force is not produced or small, and the cold solder has begun to shrink, which produces a large contraction force, resulting in pulling the hot welding joints. It is called the monument effect. As shown in the figure: the reason for the monument effect: 1. The size of the pad PAD is uneven. 2. The degree of smoothness of the welded surface is different. 3. The heating direction of the welding parts/ Balance. 4. The amount of tinnum paste is uneven. 5. The overall layout of the electronic component amount (IR is welded). 6. Wind speed and vibration during the return welding process. 7. The speed of the heating of the welded parts is uneven. The translation effect is Due to the different quantity of the two tin pastes, the melting tinnut will make the material lifted differently. Under the action of gravity, the material will translate. . As shown in the figure: The two tin pastes with the same amount of the same amount of effect will be lifted up after heating, and then the material will automatically facing the front and back and left and right positions to make it at the same height.