I bought the smallest machine from UK ISL 10 years ago and that little machine is working well still. The other two heavy machines, one german, one french, are on the robot's cemetary onboard Enterprise for possibly making spare parts for space crafts. The machines are, in my opinion, a little too tricky to use, cannot be used inline andindividual profiles are hard to create. However, for some very special purposes the method has some advantags. We have, for example, Kovar and aluminium MCMs (hybrids, stupid word), rather big mass, in which are to be soldered glass beads and ceramic components. Fixtures are needed to keep these in place during the soldering, that way the mass gets even bigger. The primary requirement is to obtain a very even heatup and as short a procedure as possible. A heat oven,the ordinary one, batch as well as conveyor, would give a long exposure time, would cause charring and an uneven temperature rise, not so the vapour phase machine, in which the flux !
!
activation takes place a minute or two in the secondary vapour zone, no charring at all, and melting within less than one minute in the primary, as there is a massive heat reservoir in the primary zone. So, for some special products, far from the ordinary PWB style, vapour phase seems to work good. As a curiosum, we also have two small Vaporettes, glass bulbs with bottom heater. In these one can study the soldering of smaller components for better insight in the vapour phase mechanism. In the whole, vapour phase was not a success within Ericsson. Maybe better for cooking succulents and succotash.
Greetings
Ingemar Hernefjord
Ericsson Microwave Systems
> Hello techies!
>
> I am looking for anyone who has performed any qualifications on the advantages/disadvantages of vapor phase reflow. Particularly dealing with higher temp alloys. Is it the way to go? Is convection better? Who are the major manufacturers? Are silicon castments to keep the bottomside components from falling off mandatory? Any replies are GREATLY appreciated.
>
> Jason Gregory
> Production Manager
> Electrospec
> (713)784-4900
> (713)784-1194 fax
>
##############################################################
TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c
##############################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in
the body:
To subscribe: SUBSCRIBE TECHNET <your full name>
To unsubscribe: SIGNOFF TECHNET
##############################################################
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################
|
