Defect : Solder Skips Process/machine infomation :  Board type - Double sided  Solderability protection - OSP  Flux carrier - Water  Preheat type - Forced Convection  Process solutions Conveyor speed too fast. a. Dwell time too short. Use chip or turbulent wave. Use Omega wave. Not enough flux. Wave height too low on one or both waves.   Board and design solutions Board/component solderability. Component layout, orientation.