Defect : Excessive solder
Process/machine infomation :
Board type - Single sided
Solderability protection - OSP
Flux carrier - Alcohol
Preheat type - Forced Convection
Process solutions
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Conveyor speed too fast.
a. Dwell time too short.
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Flux not surviving forced convection preheat.
a. Forced convection is much more effective in drying and may over dry some alcohol based fluxes.
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Flux not active enough or solids percentage too low.
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Solder temperature too low.
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Not enough flux.
Board and design solutions
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Board/component solderability.
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Lead length to pad size ratio incorrect.
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Component layout, orientation.
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