Electronics Forum | Mon Feb 03 23:49:00 EST 2003 | Dreamsniper
Hi, Has anyone who's using vapor phase process able to help me troubleshoot tombstoning? I raed about uneven forces during reflow due to misalignment, pad design, paste volume deposition unevenness due to dirty stencils, worn stencil printer parts s
Electronics Forum | Mon Apr 12 10:39:48 EDT 2004 | Ron Herbert
Correct preheating of the assembly is critical. Check with your flux manufacturer regarding the recommended topside pcb temperature as it enters the first wave. It is important that this temperature be achieved without burning the flux on the bottom
Electronics Forum | Wed Apr 07 09:54:32 EDT 2004 | Dreamsniper
Hi Guys, Can anyone help me in providing their experience in process related problems with regards to the above equipment? I noticed that it's slightly different with the wave soldering. Wave Process: Apply Flux, Pre-heat then Solder Selective Sol
Electronics Forum | Thu Jun 03 18:10:28 EDT 2004 | g2garyg2
It sounds like you will need to pre-heat the aluminum beofre using even a laser to solder this type of application. While lasers are great for many applications, especially those that have challenging keep out areas, thermal mass issues (with approp
Electronics Forum | Fri Aug 13 19:59:48 EDT 2004 | Hi CJ.
Don't be discouraged about the Zephyrtronics Air Baths from Chris' comments. I'm sure he means well, but I've seen these units being used by people who swear by them. You might also look at the APE preheating units and the Zephyrtronics...but you sh
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 | Thu Aug 11 08:56:20 EDT 2005 | pjc
Some causes of lack of top side fillets (hole fill) are: 1. Not enough pre-heat (a top side preheat will help, if no-clean flux, be sure to follow flux mfrs specification for top side board temp just before hitting wave) 2. Not enough flux 3. Flux i
Electronics Forum | Thu Aug 11 13:09:11 EDT 2005 | bman
In addition to Pete's fine tips, here's one we have successfully used in similar situations as long as you're using OA flux. Get some kind of pump action spray bottle (like hair spray comes in) and fill is with some of your wave flux. Use the bottl
Electronics Forum | Thu Nov 17 20:51:16 EST 2005 | cangly
Morning Mike, We use Pb63/Sn37, Alpha Metal alloy. Solder pot is at 250 C. The profile of board after Preheat about 100 C, Lambda Wave about 220C (use both Lambda and Chip wave), DWell time 2.1s ~ 3s. Conveyor speed 1.5 in/min. We run by bare board a
Electronics Forum | Mon Jan 09 19:09:45 EST 2006 | Mike
Basically the same exact way as a much smaller board. The only difference is the profile. Most of our boards are 0.063" thick. Looks like you found your problem. If the edges of the board are cold relative to the rework site (high difference in t
