source:Other information release time:2023-05-13 Hits: Popular:PCB Assembly company
The first, opening the window is that it is easy to go to the tin inspection criteria like the pads: go to the tin
The second, stamping oil, inspection criteria: It is not easy to go to the tin when patching. This is determined by the crafts. The reason why there is too much holes that feels without oil is as follows: because the welding oil is liquid, and the middle of the holes is over -perforated. It is empty again. The welding oil on the welding ring is easy to enter the perforated during the baking process, which causes the yellowing of the holes to occur. Related, so there will be green on top of the top, and some of the root causes that cannot appear.
The third type is that there must be such problems in the second process of oil on oil and inspection standards. The second process of oil must have this problem. For the holes like BGA, the requirements are relatively harsh. It is an important supplement to the second type. The process of oil plugging is to first plug the pores with all pores with oil and block it to the pores. In this way, the oil on the welding ring will not flow into the hole and reach There will be no phenomenon of holes.
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