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PCBA Tech
Problems of resistance welding layer and steel mesh layer
PCBA Tech
Problems of resistance welding layer and steel mesh layer

Problems of resistance welding layer and steel mesh layer

2021-12-08
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Author:pcba

The common problems of solder resist layer and paste layer in PCBA Factory: the solder mask layer on PCB circuit board is used as the layer for solder resist window opening (without green oil) (topsolder is the window opening layer of the top solder resist layer, and bottomsolver is the window opening layer of the bottom solder resist layer). When using the solver for resistance welding window opening, never use the solver alone to draw lines. First draw the wire (toplayer or bottomlayer) layer on the circuit layer of PCB board, and then use the solver to overlay and draw lines on other PCB boards on the required wires. Moreover, the line width of the solver must be smaller than or the same as that of the wire!

PCBA

The paste layer on PCB circuit board is the layer used to make steel mesh (toppaste is the top steel mesh layer and bottompaste is the bottom steel mesh layer). Usually, the PCB design software is closed by default, because it does not affect the design. As long as the pad is selected as the "toplayer" or "bottomlayer" layer, the corresponding steel mesh layer will be automatically generated as soon as the "toppaste" or "bottompaste" is opened, so it is not necessary for the designer to open it during design. However, if you need a square or strip-shaped paste (steel mesh layer), you must open it and draw it where you need it on the PCB. In this way, PCB manufacturers will automatically identify it.

If the file provided to the PCB patch processing factory opens the paste layer, but there is no special paste layer (such as square or strip-shaped paste) on the PCB diagram, the PCB manufacturer is likely to overlay it with the holder. It should be noted that solver and paste are two layers with different concepts, which must not be confused. The paste layer will not be used for resistance welding and window opening in PCB manufacturers, which must be paid attention to.


Through hole cover oil: through hole cover oil is a standard industrial design requirement for mass production. PCB board manufacturers usually cover oil by default (no matter how your circuit board is set, except Gerber file, PCB Factory will only do it according to your Gerber file). Therefore, if the via needs to be windowed, it should be specially noted: "the via does not need to be covered with oil" and inform the PCB manufacturer.

How PCBA manufacturing sets the via oil in Protel or pads software: there is a "tenting" first item in the via attribute in Protel. If it is checked, it indicates the via oil. In this way, all the vias in the transferred Gerber file are covered with oil. In pads, when outputting soldermask (i.e. solder mask), as long as "vias" under "soldermask top" is checked, it represents all through-hole windowing, and if not checked, it represents oil cover.