1) why you need 100W? I am sure BGA needs less...
2) balling 24 hrs a day sounds good... how expensive it could be?
per device should be cheap... besides, you can possibly repair using
laser rather than repair the complete device by reflow...
jk
On Dec 7, 2007, at 7:52 AM, Eric CHRISTISON wrote:
> My company uses lasers for putting the balls onto BGA packages in
> mass production. The equipment is eye wateringly expensive but in
> some circumstances where the machines are balling the same device
> 24 hours a day it seems to make economic sense.
>
> I'd agree that for other applications the process wouldn't seem
> very well suited.
>
>
>
> Hernefjord Ingemar wrote:
>> Yes, I think the cost was a disadvantage. The last 100W YAG we
>> bought a few years ago was at some 500,000 USD (not for
>> soldering). You get several IR ovens for that sum. And the
>> throughput for a laser is slow compared to oven mass soldering.
>> Would be interesting to know how many TNetters have a laser
>> soldering equipment...
>> /Inge
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
>> Sent: den 6 december 2007 23:41
>> To: [log in to unmask]
>> Subject: Re: [TN] Laser Soldering vs Selective Soldering
>>
>>
>> Yes it did fade away, although I am not sure it ever really
>> blommed. I remember when I put a laser soldering YAG system on
>> the SMARTEX exhibition production line in Wiesbaden Germany in
>> 1987 that :
>>
>> A It worked fantastically well
>> B Everone was excited about it
>> C The yields were fantastic
>> D Nothing ever came of it...............cost??
>> John Burke
>> (408) 515 4992
>>
>> -----Original Message-----
>> From: Hfjord [mailto:[log in to unmask]]
>> Sent: Thursday, December 06, 2007 2:35 PM
>> To: 'TechNet E-Mail Forum'; 'John Burke'
>> Subject: SV: [TN] Laser Soldering vs Selective Soldering
>>
>> The trick (YAG) seems to be the ramp-up of pulses. I don't
>> remember what sequence was optimal, but if you had tens of
>> variations of solder and components, there was a lot of
>> experimenting to find the individual shot ramp-ups. The enthusiasm
>> for laser soldering faded away....this was 15 years ago...at
>> least. Inge
>>
>> -----Ursprungligt meddelande-----
>> Från: TechNet [mailto:[log in to unmask]] För John Burke
>> Skickat: den 6 december 2007 19:20
>> Till: [log in to unmask]
>> Ämne: Re: [TN] Laser Soldering vs Selective Soldering
>>
>> CO2 has been around since the mid '80's as soldering systems
>> (Dynapert as
>> was) as have YAG soldering systems, I have used both - they both
>> work.
>>
>> CO2 is less forgiving as you have to have total accuracy, if it
>> hits the laminate it will basically burn it as from memory you get
>> total absorption at that frequency.
>>
>> Use a (prime frequency) YAG and it will be more forgiving as the
>> joint has high absorption whereas the laminate is from memory 10
>> to 20% so you will not have the same effect, in fact I have seen
>> demonstrations where the vendor was soldering joints by lasing
>> through the BACK of a board (Basel Laser Technik - 1986)
>>
>> If you really want to do this there are vendors who make laser
>> rework equipment which might be suitably modified.
>>
>> Kind regards,
>>
>> John
>>
>> John Burke
>> (408) 515 4992
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ray, Carl (GE
>> Indust, GE
>> Fanuc)
>> Sent: Thursday, December 06, 2007 5:57 AM
>> To: [log in to unmask]
>> Subject: [TN] Laser Soldering vs Selective Soldering
>>
>> Hi All,
>> How many of you "out there" have any experience with laser
>> soldering machines verse selective soldering machines? Currently
>> we have several types of selective soldering equipment but due to
>> our designs we are having significant issues with adjacent
>> components. I have seen some equipment but do not have experience
>> with the venders or process.
>>
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>
> --
> Eric Christison Msc
> Mechanical Engineer
> Home Personal, Communication Sector
> Imaging Division
>
> STMicroelectronics (R&D) Ltd
> 33 Pinkhill
> Edinburgh EH12 7BF
> United Kingdom
>
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> Fax: + 44 (0)131 336 6001
>
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