Electronics Forum | Tue Jan 31 12:53:50 EST 2006 | Chunks
We just did this and are awaiting the results. Solder balling and a burnt looking flux where visual indicators that we noticed running regular paste at no-lead temps.
Electronics Forum | Wed Oct 07 15:25:02 EDT 1998 | Joe P.
Hi Everybody | | Is anyone aware of the possible causes that may lead to voids in the solder bumps after assembly. We assembled some dice on thin substrates and after assembly, void formation in the solder bumps were observed. | We have alread
Electronics Forum | Thu Oct 08 14:04:04 EDT 1998 | Kris Ewen
Manish, I've seen similar phenomenon when processing CSPs on our cards. In our case, we were placing the components over the opening to in-pad blind vias. Due to poor drilling and plating processes by our board suppliers, volatiles were outgassing
Electronics Forum | Fri Jun 22 07:16:37 EDT 2012 | brettrenishaw
Spray fluxing yes but have checked the uniformity by using a fluxometer. Also have put boards through with only flux and preheat. no wave up to see if the carrier is being burnt off. I will look into the skip plating issue. Thanks again
Electronics Forum | Fri Oct 25 03:46:37 EDT 2002 | Adam
GUYS HOW SAFE IS IT TO USE RMA FLUX WHICH IS DESIGNED FOR WAVE SOLDERING, TO USE FOR TOUCH-UP/REWORK ? CURRENTLY ALL OUR OPERATORS HAVE LITTLE RE-FILLABLE BOTTLES AND GO AND FILL THEM UP FROM THE FLUX CONTAINERS ( I'M NOT EVEN TOO SURE WHETHER OR NO
Electronics Forum | Thu Sep 23 08:59:20 EDT 1999 | Wolfgang Busko
| Hiya, | | Could anyone please suggest recommended manufacturers of | IR rework stations for the removal of various SMT comps. | | Cheers | Why IR ? Ok, I�ve seen only one but that thing burnt the PCB before the solder was melting and costs a lo
Electronics Forum | Wed Jan 17 15:13:24 EST 2007 | jaime39
When placing the part to be reflow try applying heat to the board from the secondary side until the primary side has a temperature of about 130 degrees celcius. Following this procedure it should minimize the heat exposure of the part being soldered.
Electronics Forum | Thu Feb 14 17:40:34 EST 2013 | jorge_quijano
PCB Supplier made an EDX anaysis, the found a chemical trapped in the holes, and some burnt burrs, according to what they say this stains are over the solder mask & silk, so they do not affect functionality.
Electronics Forum | Thu Sep 23 09:28:49 EDT 1999 | Earl Moon
| | Hiya, | | | | Could anyone please suggest recommended manufacturers of | | IR rework stations for the removal of various SMT comps. | | | | Cheers | | | Why IR ? Ok, I�ve seen only one but that thing burnt the PCB before the solder was meltin
Electronics Forum | Fri Sep 09 13:27:28 EDT 2005 | Denis
Hello, I'm not sure if this is the right place to post this. I am looking for a place that would do surface mounting for me. I have the PCB already made and I have the SMT chip. I have tried soldering it with a solder gun, but I think I burnt out
