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WAVE SOLDERING PROBLEM - COMPONENTS are RAISED

E

Eeyore

kuba said:
maybe that's the problem. But I know, that when we used lead solder
there were also problems with raised components :(

Oh yes. That is true but maybe lead-free makes it worse ?

Maybe do you know people working in similar factories than mine ? I want to
contact with
quality engineers from factories producing pcb circuits.

I'm sure there must be 'industry groups' who can provide advice about this sort
of thing but I can't help much more.

Oh, one thing occurs to me. Some components have versions with leads that 'lock
in' to the pcb to stop this kind of lifting.

Graham
 
C

ChairmanOfTheBored

Hmm... I don't quite understand. Could you please explain it one more
time for me?

Solder mask is usually placed on the solder side of a PCB assembly over
those holes that one does not have a component in, but needs to keep
clear of solder.

In this usage, one places a big, long squirt of it on the component
side of the board. About a quarter to half inch on the board (in a clear
area) and then up and over the component, and back down to the board.

After curing, the part will remain in place through the solder process,
and the "mask" (glue in this case) can easily be removed, just as it is
in the case of solder side coverage.
I understood, that I must cover tips of connector with
tin solder. It's impossible to do this, because I work in very big
factory, and we cannot make this with each connector :((( I know, that
we should buy special PCB carriers, but money money money.... :)


With this method, it is not required to pre-solder for fixturing, which
does not guarantee against movement completely anyway.

It's like a rubber tie wrap... :-] (latex)
 
C

ChairmanOfTheBored

Thank you for this message, but I have question. Do you know which
exactly glue would be perfect for this problem? I'm not a glue-
specialist :)


Surface mount component adhesive is very expensive, and usually heat
cured... more extra steps. The latex mask from a squirt bottle,
however, is cheap, and can be applied by the assembler right after
inserting the connector, and be dried by the time the assembly reaches
the wave solder process.
 
C

ChairmanOfTheBored

Here are some examples


$18 a bottle? No thanks. I sure hope the industry doesn't ream you
guys "over there" on all your electronic manufacturing aids.
 
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