I agree. We converted an AirVac and use SAC. The new nozzles are Ti and
there is no problem with solder sticking. It sounds like there may have
been some mechanical abrasion that is allowing the solder to stick, but not
wet. We run an Electrovert and regularly purchase and replace fingers. I
would try replacing some fingers with new ones and see if the problem
persists. Electrovert should be able to supply some or direct you to a
distributor.
-----Original Message-----
From: Eric CHRISTISON [mailto:[log in to unmask]]
Sent: Friday, August 04, 2006 9:25 AM
To: [log in to unmask]
Subject: Re: [TN] SAC 305 solder on TI wave solder machine transport
fingers
Well, my simplistic view would be that it's either the solder or the
fingers. If there's nothing funny about the solder then are you sure the
fingers are really titanium? Do you have a CofC for the material they
were made from? Can you get a "genuine" piece of titanium and see if the
solder sticks to that. If it does then you'll be able to show Alpha
metals something that they've never seen before.
Neil Maloney wrote:
> Our Alphametals guy says that they (Alpha)have never seen this before.
> Nobody else in the solder business (machine or material) has an answer
> for us either. I guess that I will buy a few new fingers and see if
> they grab solder off the wave.
>
> -----Original Message-----
> From: Eric CHRISTISON [mailto:[log in to unmask]]
> Sent: Friday, August 04, 2006 8:12 AM
> To: [log in to unmask]
> Subject: Re: [TN] SAC 305 solder on TI wave solder machine transport
> fingers
>
>
> Kevin,
>
> I don't have a solution but I wonder if you've discussed the problem
> with the solder manufacturers? They should understand the metallurgy of
> their product and hopefully be able to give you a solution.
>
> Regards,
>
>
>
> Kevin Glidden wrote:
>
>> You could try buying some composite material (pallet and fixture
>> materials) and having replacement fingers machined for you..expensive
>> solution but it would work...
>>
>> Kevin Glidden
>> Manufacturing Engineer
>> Luminescent Systems Inc.
>>
>>
>> -----Original Message-----
>> From: TechNet [mailto:[log in to unmask]] On Behalf Of Neil Maloney
>> Sent: Thursday, August 03, 2006 5:05 PM
>> To: [log in to unmask]
>> Subject: [TN] SAC 305 solder on TI wave solder machine transport
>> fingers
>>
>> Greetings Technet.
>>
>> I have an interesting problem that has developed since we converted to
>>
>
>
>> our lead-free process. We have been using an Electrovert Astrapak for
>>
>
>
>> our wave solder operation for many years in our SnPb process. A few
>> months ago, we converted the machine for SAC305 by installing new
>> titanium parts (solderpot, pumps, wave guides, etc) and loaded it up
>> with Alpha metals SAC305. We removed and cleaned up the transport
>> fingers in alcohol while the pot conversion was under way. After
>> putting the machine back together our new lead-free process seemed
>> perfect -- except that now the SAC305 is sticking to the titanium
>> transport fingers- I mean really sticking to them. The smooth wave
>> doesn't seem to affect the fingers as much as the chip wave- but after
>>
>
>
>> a run of about 200 PCBs- the fingers are fouled with solder - to the
>> point that we have to stop and brush out the fingers with a rotary
>> wire brush.
>>
>>
>> We never had this problem with leaded solder. We do not have an
>> automatic finger-cleaner installed on the machine (we never had this
>> problem before) and I cannot find one anywhere to retrofit. But the
>> question still comes down to-- what is causing the solder to stick
>> where it did not stick before?
>>
>>
>> We use a no -clean flux (Alpha EF2202 or Indium 1075, makes no
>> difference --the solder still sticks.) The fingers were not changed
>> out (only soaked and cleaned with alcohol) when the rest of the
>> machine was converted to lead-free.
>>
>> Any insight into solving the problem would be greatly appreciated.
>>
>> Neil Maloney, Manufacturing Engineer
>> Contemporary Control Systems, inc
>> 2431 Curtiss St Downers Grove, IL 60515
>> (630) 963-7070 x132
>> [log in to unmask]
>> http://www.ccontrols.com <http://www.ccontrols.com/>
>> http://www.ctrlink.com <http://www.ctrlink.com/>
>>
>>
>>
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