Hi,
It is not really an issue, particularly with the modern controlled machines sold nowadays.
Werner
-----Original Message-----
From: Thayer, Wayne - IIW <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, Feb 9, 2011 7:53 am
Subject: Re: [TN] Vapour phase soldering?
I haven't used vapor phase, but it would seem that while the temperature of the
vapor bath is extremely controlled, the rate of heating can be an issue, not
only for hitting a defined profile, but because the rate of heat absorption is
mostly a function of surface area. So if you have a small but thermally massive
device next to a large but low mass device, then you will have quite a bit of
delta T during the cycle.
But I haven't seen mention of the above principle during this thread. Is it
because it's not really an issue?
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Naisbitt
Sent: Wednesday, February 09, 2011 6:30 AM
To: [log in to unmask]
Subject: Re: [TN] Vapour phase soldering?
Techies
I know that there are solvents with very specific boiling points from 185C to
>280C at 5C or 10C increments.
When I was involved in this technology, we used a 220C BP solvent that worked
superbly with SAC305 and similar lead-free alloys that gave us a 1C DeltaT.
I would avoid high BP solvents unless your alloy really demands it. Of course
part of the problem with most systems is maintaining and controlling the T
profile. We did it in our equipment using a sealed chamber. That patented
technology is, I believe, now exclusively available out of REHM - with whom I
have no association, in case anyone was wondering!
Hope this helps
Graham N
Gen3 Systems, UK
www.gen3systems.com
On 8 Feb 2011, at 20:43, Paul Edwards wrote:
> Have used Alpha WS-809 at 240C if the profile is relatively peaky...
>
> Paul
>
> Paul Edwards
> Process/Quality Engineering
> Surface Art Engineering
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Julie Silk
> Sent: Tuesday, February 08, 2011 12:37 PM
> To: [log in to unmask]
> Subject: Re: [TN] Vapour phase soldering?
>
> For the first, we use VPR at a couple of suppliers, Jabil and Venture, but
they
> don't have the capability at all sites.
>
> For the second, the concern is that the standard flux used in tin-lead paste
> typically will not survive 240C. It will burn out and you won't get good
joints.
> You can use tin-lead with higher temperature flux.
>
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