Ioan
I completely agree with Bev - get the facts first then decide.
My own investigations yielded the following:
Condensation soldering offers significant process
advantages:
• Accurate and uniform temperature control up to 250˚C with <5˚C
∆T above reflow. This avoids both flux vitrification and lead oxide
formation within the joint.
• Reflow process takes place within an inert atmosphere
• Temperature differential on BGA’s is at a maximum of: 1.4˚C ∆T
between internal and external solder spheres
• Soldering thermal equilibrium across BGA in 1.2 seconds
• Automatic self-alignment of components during soldering, thus
placement accuracy is far less critical
• Huge reduction in soldering defects due to self-alignment from
uniform reflow E.g. 50cm x 40cm assembly equipped with 48 BGA’s.
9,000 boards processed with a defect level of zero ppm!
• 80% reduction in energy consumption as compared to Convection Reflow
• Typical running costs are <£1.40 / hour Vs. >£10 / hour for
Convection systems with N2 - and that includes capital amortisation.
Whilst I understand Brian's environmental concerns, we still have to
get stuff out the door that works and at a reasonable price.
On a personal note, I strongly believe that we will all see a
significant softening of the "Green Brigade" as we hurtle into the
next ice age. Turn up the heat!
Graham Naisbitt
On 12 May 2008, at 14:23, Ioan Tempea wrote:
> Dear Technos,
>
>
>
> I would like to get your expert opinion on the latest developments in
> the vapour phase technology. The last time this topic has been
> discussed
> here this was still an environmental hazard.
>
>
>
> Here's the latest sales pitch:
>
>
>
> Dear Convection Oven Users:
>
> With Energy Costs Skyrocketing, You have a cheaper, efficient, and a
> better yield Alternative!!
>
> Low Operating Cost, 110 Volt Machine, Run Lead and Lead Free
> Sequentially!!
>
> High Yield, Run your Lead Free Boards at 230 Degrees Uniform
> Temperature
> Distribution, No Circuit Board Delamination, Uses Environmentally
> Friendly Teflon 2 Liquid No Hazardous Florocarbons!
>
>
>
> The questions are:
>
> * Are the advantages real, should I prefer vapour phase over
> convection in day by day reflow operations, from the technical point
> of
> view?
>
> * Would the technology finally be environmentally friendly?
>
>
>
> Thanks,
>
>
>
> Ioan
>
>
>
>
> ---------------------------------------------------
> Technet Mail List provided as a service by IPC using LISTSERV 15.0
> To unsubscribe, send a message to [log in to unmask] with following
> text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]
> : SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]
> : SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
> for additional information, or contact Keach Sasamori at [log in to unmask]
> or 847-615-7100 ext.2815
> -----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
