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Principles and specifications for the use of lead-free solder paste

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Update time : 2022-10-21 19:24:54
Principles of use of lead-free solder paste:
1. The use of solder paste must give priority to the use of recycled solder paste and can only be used once, and then scrap the rest.
2. The principle of using solder paste: first use first (the remaining solder paste must be mixed with new solder paste when using the first time, and the mixing ratio of old and new solder paste should be at least 1:1 (the proportion of new solder paste is better, and it is the same) model same batch).
6. Matters needing attention: The refrigerator must be powered on for 24 hours, and the temperature should be strictly controlled at 0°C - 10°C.
Specifications for the use of solder paste
1. The quantity of solder paste should be counted.
2. Confirm FLUX content, rosin type, particle shape and MESH number.
3. Solder paste containers are numbered.
4. Label the container with the expiration date.
5. The freezing temperature of solder paste is -26C.
The solder paste taken out of the refrigerator should be placed for more than 4 hours, so that it can completely return to normal temperature before opening the container lid to prevent the solder paste from absorbing moisture and producing solder balls during the Reflow process.
1. Keep 4-6 cans of containers in the solder paste rewarming area at any time. When one can is used, another can must be taken from the refrigerator and placed in the rewarming area. Please follow the numbering order, with the smallest number taking precedence. take.
2. The unloaded solder paste must be sealed and not exposed to the air. Before adding the solder paste on the steel plate, it needs to be stirred evenly.
a. The solder paste should be warmed back to the room temperature [24-26°C].
b. Use a stainless steel spatula to stir evenly during dynamic stirring. The slower the stirring efficiency, the better, so as not to damage the solder particles. The solder particles have a large proportion and often settle at the bottom of the container.
c. Mixing time of solder paste mixer (MALCOM): Model SS-1 for 4 minutes, 1 can at a time; Model SPS-2 for 1 minute, 1 can at a time.
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