Solution34

Defect : Insufficient solder

Process/machine infomation :

Board type - Single sided

Solderability protection - OSP

Flux carrier - Alcohol

Preheat type - Infrared

Process solutions

• Conveyor speed too slow.

  a. Time over preheat too long causing flux to be burned
  off.

  b. Dwell time too long causing flux to be destroyed before
  exiting the wave.

• Topside board temp too high for flux, causing flux to burn
  off before board reaches waves.

• Flux not active enough or solids percentage too
  low.

• Not enough flux.

• Wave height too low on one or both
  waves.

Board and design solutions

• Lead to hole size ratio.

• Board/component solderability.

• Component layout, orientation.