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solder skips in chip wave on a NU/ERA wave solder

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#58894

solder skips in chip wave on a NU/ERA wave solder | 25 May, 2009

Hello !!

I have a problem with my wave solder oven, in one of the products we made has connectors on one side of the pcb and in the other one has SMT components the process is kinda tricky on the SMT components we use an adhesive and put to the reflow oven to cure,after that we put the connectors on the opposite side of the SMT components, then is taken to the wave solder where we use the chip wave and solder wave to solder the components and the pins of the connectors the thing is that the for some reason the diodes are sometimes without solder, like it never touch the board.I have tryto bring the conveyor donw a bit more with the only result that the solder sometimes goes thru some holes on the pcb, even crank up the RPMS in the pump to make it shoot the solder more high but no luck. has someone had a problem like this? and how can I fix it?

thanks

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#58899

solder skips in chip wave on a NU/ERA wave solder | 26 May, 2009

Hi!

From your post, it seem like the wave did not really touch the component. You probably need to get the both wave height correct and that it hits the component.It is normal for solder to come through the PCB when using chip wave. The through-hole on the PCB can be covered by KAP-TON tape to avoid excess solder coming up.

Besides, try to check the presetting. Is the flux enough? Is the preheat temperature sufficient to heat the board to temperature? Or probably you just need to slow the conveyor abit for it to stay on the solder pot a bit longer to get the smt part solder.

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#58911

solder skips in chip wave on a NU/ERA wave solder | 27 May, 2009

Thanks !

I will try your recommendations, about the flux and the preheaters, yes they seems to be ok

I will bring down de conveyor speed because it looks like if it is to fast is set to 3.6ft

thanks again!

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#58914

solder skips in chip wave on a NU/ERA wave solder | 27 May, 2009

Armando,

Make sure chip wave is pumping evenly across. These TD machines require a lot of maintenance (deep cleaning)to ensure all the holes on nozzle are open...

My two cents,

George

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#58941

solder skips in chip wave on a NU/ERA wave solder | 29 May, 2009

Check that you are getting an even spray pattern from the fluxer.Check that the chip wave nozzle is clean and if possible feed the PCB in to the wavesolder unit at 90 � or 180�.

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