Electronics Forum | Wed Jul 31 07:37:06 EDT 2002 | pjc
Are you using water based flux? Any preheaters on the SS machine?
Electronics Forum | Wed Jul 31 07:44:54 EDT 2002 | mzaboogie
Hi Pete, It is an alcohol based NC flux. The machine does have quartz preheaters. We are preheating to the temp specified by the flux. Thanks Chris
Electronics Forum | Thu Aug 01 14:23:47 EDT 2002 | pjc
Ah, yes...the solvents. I'll bet with SS machines vs. WS machines there is way less dwell time at preheat so you don't evap enough solvents. Do any of these SS machines use force-convection preheats or are they and IR type?
Electronics Forum | Mon Nov 19 14:10:13 EST 2007 | realchunks
Hi Taint, Both machines work OK. The big thing you may over look is pre-heat. Things like flux spatter/boil tend to come into play if you don't pre-heat. Change over, ease of programming, and service are also things to think of.
Electronics Forum | Fri Sep 24 11:32:06 EDT 2004 | C Lampron
Hi John, We have been selective soldering for about two years. My suggestion is to use the same guidelines for preheat, duration and temp as you would in wave. Your flux manufacturer should be able to provide you with the details. Good Luck Chris
Electronics Forum | Fri Oct 22 19:07:29 EDT 2010 | jry74
To get out of a delivery pinch, I had to pre-tim some connectors because of contaminated leads. Make sure your selective wave speed and XYZ travel are close. Try doing a dry run across the board to preheat the PTH and then go back and solder them.
Electronics Forum | Mon Feb 28 19:36:39 EST 2000 | Tony
I work for a contract manufacture of PCB's, we are also in the BGA rework business. We see all kinds of different size boards, as well as different types of BGA's and micro BGA's. We selected the Conceptronics Freedom 2000 over the Air Vac and SRT. T
Electronics Forum | Mon Feb 28 19:36:39 EST 2000 | Tony
I work for a contract manufacture of PCB's, we are also in the BGA rework business. We see all kinds of different size boards, as well as different types of BGA's and micro BGA's. We selected the Conceptronics Freedom 2000 over the Air Vac and SRT. T
Electronics Forum | Wed Jul 27 03:50:51 EDT 2005 | aj
Crishan, I am not familiar with the machine you mentioned. Do you use selective solder pallets through a wave process or is the machine a selective soldering machine (ie. where the board is moved to the solder fountain) No matter what the process
Electronics Forum | Fri Sep 11 15:27:50 EDT 2015 | u4bga
Hi! We're noticing white spots on 2 PCBAs after the selective soldering & DI Wash processes. ----Facts---- 1) The marking is on all boards, irrespective of date code 2) It only happens on leads that have been selective soldered 3) The pattern of w
