Simple: skimp on the cleaning process = catastrophe
Qualify your process with good overall contamination and SIR/ECMR
control and monitor the production process with ionic contamination
control every hour.
Compare the residual contamination, using your qualified flux and
soldering process, with cleaning in, say, at least 6 different machines
after a constant interval - choose the one that leaves the least overall
and under-component contamination. Be present at all these tests to make
sure that the machine manufacturer doesn't cheat by cleaning the board
several times or adjust the settings to impractical throughputs (of
course, not that any of them would!!! Much!!!)
Brian
Dehoyos, Ramon wrote:
>>To: 'Brian Ellis'
>>Subject: RE: [TN] OA / RMA
>>
>>
>> Thanks Ellis:
>> Could you expand on unforgiving of errors, requires good process control and good quality cleaning equipment rarer than you think.
>> Regards,
>> Ramon
>>
>>
>>-----Original Message-----
>>From: Brian Ellis [SMTP:[log in to unmask]]
>>Sent: Tuesday, May 04, 2004 2:20 AM
>>To: TechNet E-Mail Forum.; Dehoyos, Ramon
>>Subject: Re: [TN] OA / RMA
>>
>>I installed the first OA (misnomer, WS is better) full scale
>>wave-soldering production line in Switzerland (if not in Europe) as long
>>ago as 1965. The company in question is still using it,four soldering
>>machines later. I have since aided in many others, throughout the world.
>>Advantages of WS:
>>- better quality soldering with fewer rejects
>>- more tolerant of poorly solderable components
>>- widest operating window
>>- no expensive cleaning products
>>- minimal pollution from overall process
>>- lowest production costs
>>Disadvantages:
>>- requires good process control
>>- unforgiving of errors
>>- good quality cleaning equipment rarer than you think
>>- flux itself is fairly corrosive
>>Summary:
>>- requires a serious approach and qualification
>>- with this proviso, this is the way to go.
>>
>>Brian
>>
>>Dehoyos, Ramon wrote:
>>
>>> Hi Technetters:
>>> Has anybody done a comparison study of RMA/OA fluxes for wavesolder? Or any personal experiences in this regard will be appreciated.
>>> Thanks in Advance
>>> Ramon
>>>
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