1.Discolored Solder Joint( 焊點變色 )
拒收 良好情況
缺點描述 :
Absence of silvery metallic colour.
錫點失去金屬的銀灰顏色
可能因素 :
- Solder temperature too high
- 錫點溫度過高
- Inappropriate preheat temperature and conveyor speed
- 預熱溫度或輸送帶速度不恰當
- Flux, board and components contamination
- 助焊劑 , 板子或零件髒污
可行的預防方法 :
- Maintain the solder and preheat temperature according to the manufacturers’ specifications
- 維護迴焊及預熱溫度符合製造參數
- Ensure there is no or minimize contamination on the flux, board and components
- 確保助焊劑 , 板子或零件沒有或最少量的髒污
- Maintain a appropriate conveyor speed so that the heat transfer to the board during the process is not too excessive or deficient
- 維護適當的輸送帶速度使過程中溫度傳送到板子上不會過量或不足
重工注意事項 : 無
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.