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Subject:	Dross inclusions
From:	Ed Popielarski <[log in to unmask]>
Reply To:	Ed Popielarski <[log in to unmask]>
Date:	Fri, 22 Oct 2004 17:08:07 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (32 lines)

Hi 'netters,

I have a client with an uncommon problem and seek some suggestions.

For the past year, the wave solder operator has been trying to "save the company money" by stacking the dross in the rear of the dual wave Treiber pot. He perceived that the dross was dissolving back into the solder as the 6" high mound would drop to about 2", ready for the next load, repeat. Unfortunately, the truth is the weight simply pushed the dross down to the bottom of the pot where the impellers chopped it into fine particles and placed them into suspension throughout the body of the solder.

Most processed boards looked OK, but a recent new design with large (1/2" x 1/2" x 1/8") terminals on the bottom of the board showed dross inclusions embedded in the soldered surface.

The surface of the wave has small particles of dross flowing with the solder, even after dedrossing the nozzles, and letting the pot sit undisturbed while turned on for several days hoping the particles would float to the surface.

A so called industry expert said it will simply go away by itself, but it's been over 2 months and the sandy appearance in the wave persists, along with the embedded inclusions. I believe the solder is ruined and should be replaced.

If anyone has seen this before, please let me know what you did to resolve it.



Regards,

Ed Popielarski
QTA Machine
949-581-6601

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