Yes,
These machines can suck balls back off a device as well as putting them.
Regards,
Yuan-chia Joyce Koo wrote:
> 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
>>
>> Tel: +44 (0)131 336 6165
>> Fax: + 44 (0)131 336 6001
>>
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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
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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