Thanks Werner

The modern systems are far better.

BTW, can y'all stop sending us your rotten weather? We almost have  
our own vapour phase over here.

Kindest regards,

Graham Naisbitt

[log in to unmask]



On 13 Feb 2007, at 15:28, [log in to unmask] wrote:

> Hi Graham,
> You are absolutely right, with the LF-solders, vapor phase  
> soldering is the way to go, because of
> (1) assured uniform temperatures, everywhere, and
> (2) soldering just above Liquidus is possible avoiding the much  
> higher peak reflow temperatures needed because of the thermal  
> gradients resulting from all other heat transfer modes.
>
> Unfortunately, this technically very elegant way of reflowing  
> solder got a black eye in its earlt history, because oven  
> manufacturers designed their oven improperly in terms in  
> insufficient pre-heating capability [resulting in solder pooling up  
> component leads] and insufficient sealing [resulting in expensive  
> vapor fluid losses].
>
>
>
> Werner


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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
-----------------------------------------------------