Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Toni Casas i Pujadas

#15455

Outgassing in Wavesoldering | 13 June, 1998

We are very concerned about outgassing in wavesoldering. If anyone knows how to use properly well pcb's before soldering in order to avoid this problem please let me know. I have this problem in FR4 large double sided pcb's. My soldering line is SOLTEC

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Earl Moon

#15457

Re: Outgassing in Wavesoldering | 13 June, 1998

| We are very concerned about outgassing in wavesoldering. | If anyone knows how to use properly well pcb's before soldering in order to avoid this problem please let me know. I have this problem in FR4 large double sided pcb's. My soldering line is SOLTEC If you're talking about outgassing from plated through holes, moisture and/or entrapped chemical residue is most often the problem. If the boards have been properly processed and meet all other specified quality requirements, a pre bake cycle is recommended to eliminate entrapped moisture. A pre bake cycle of 3 hours at 250 F., within 24 hours (depending on climatic conditions as relative hunidity, etc.) will do the job. If other than moisture, you have more serious problems that cannot be rectified short of ensuring your supplier effectively manages processes. I have many descriptive pictures, as x-sections, showing this phenomonon. Earl Moon

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Bob Willis

#15456

Re: Outgassing in Wavesoldering | 15 June, 1998

| We are very concerned about outgassing in wavesoldering. | If anyone knows how to use properly well pcb's before soldering in order to avoid this problem please let me know. I have this problem in FR4 large double sided pcb's. My soldering line is SOLTEC If you need to test boards with out soldering them or damaging them for outgassing there is a procedure on my web wage. Also some comment on the reliability of joints.

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