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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