1.Discolored Solder Joint( 焊c色 )
拒收 良好情r
缺c描述 :
Absence of silvery metallic colour.
ac失去金俚你y灰色
可能因素 :
- Solder temperature too high
- ac囟冗^高
- Inappropriate preheat temperature and conveyor speed
- A囟然蜉送速度不恰
- Flux, board and components contamination
- 助焊 , 板子或零件v污
可行的A防方法 :
- Maintain the solder and preheat temperature according to the manufacturers’ specifications
- So焊及A囟确合u造
- Ensure there is no or minimize contamination on the flux, board and components
- _保助焊 , 板子或零件]有或最少量的v污
- Maintain a appropriate conveyor speed so that the heat transfer to the board during the process is not too excessive or deficient
- Som的送速度使^程中囟魉偷桨遄由喜^量或不足
重工注意事 : o
Discolored solder joint is desoldered with the help of a chisel-shaped soldering tip and solder wick.The solder wick should be pressed into the corner long enough to let the heat travel into the gap underneath the component so that the solder is sucked out.The joint is resoldered back by placing the solder iron against it long enough such that the transfer of heat is sufficient enough before placing the solderwire close to the tip of the iron.
