Morning Ken -

We encountered a situation a few years back where a board fabricator had
implemented weld repairs on a number of boards they supplied us, without our
knowledge.  By the time we discovered the problem, we had a considerable
amount of hardware built.

Our actual discovery of the condition was prompted by test failures resulting
from weld failures which occurred during the wave soldering process.
Subsequent environmental testing indicated these particular welds were not
reliable.  Sorry, I no longer have the data on the size and type ribbon used
in the parallel gap welding process.

I would consider this as an option only after an exhaustive evaluation of the
suppliers processes and considerable testing of his welded specimen.  All of
this tends to come at a fairly high price tag.  I strongly recommend that you
work with the board supplier to correct the problems that necessitate such a
consideration, rather than resort to weld repairs.

Regards - Kelly

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