Now plug-in lamp beads and chip lamp beads are required to be reflow welded, so the lamp beads can basically be under 240 ℃.
If the LED lamp bead is reflow welded, the reflow temperature must be set, otherwise it is easy to form the dead lamp phenomenon of batch lamp bead, which can't be recovered. So how can led reflow soldering work well to form such unnecessary loss. Jingchuanghong will explain it for us here
1、 After the temperature curve of LED reflow soldering is adjusted, it must go through the first plate and do all kinds of quality recognition before mass production. This is the first piece of work recognized in the factory quality management.
2、 Before welding, we must read the factory specification of LED lamp bead and its technical parameters
1. To see the temperature resistance of LED lamp bead package data;
2. To see what information is the LED welding substrate, such as general PCB (fiberboard, etc.), aluminum substrate, ceramic plate, etc;
3. It depends on welding flux, high temperature or low temperature solder paste, or resin, etc;
4. According to the practical quality of LED reflow soldering equipment, the number of LED reflow soldering temperature zone, the control of pole velocity, fan, temperature setting of each zone and other parameters should be considered.
3、 Refer to the general adjustment parameters of LED reflow soldering LED lamp beads
The lowest temperature is 150-170 ℃, the highest temperature is 240-245 ℃ (the highest temperature can be adjusted to 260, if 245 ℃ can dissolve tin, do not adjust to 260), the time above 220 ℃ cannot exceed 60 seconds, if the temperature is adjusted higher, the time at 260 ℃ cannot exceed 10 seconds. If the temperature range is 7, please refer to the following settings: 160, 170, 175, 180, 190, 210, 245, 220. If the LED lamp bead is a silica gel lens, it can use bi58sn42 solder paste with a maximum temperature of 225 ℃. If it is a PC lens, the substrate cannot be reflowed.
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