There are numerous reasons for the rosin joint of the finished product in PCB processing.
1) Rosin joints caused by process factors:
a) Missing solder paste
b) Insufficient amount of solder paste applied
c) Steel mesh aging, leading to poor leakage
2) PCBs have poor solderability
3) Via holes on the pads
4) Distortion of component pins
5) Oxidation of component pins
1) Rosin joints caused by process factors:
a) Missing solder paste
b) Insufficient amount of solder paste applied
c) Steel mesh aging, leading to poor leakage
2) PCBs have poor solderability
3) Via holes on the pads
4) Distortion of component pins
5) Oxidation of component pins
