Electronics Forum: soldering (Page 1433 of 2103)

SMT Reflow temp

Electronics Forum | Wed Mar 11 17:32:46 EDT 2015 | jlawson

Small paste deposits have less flux thus less flux activity to enhance the wetting. So preheat needs to be as short as possible, ramp to spike if possible. Try not to ramp hold and spike - pending thermal delta on product can be made to ramp to spike

DQFN INSUFFICIENT SOLDER / HEAD ON PILLOW

Electronics Forum | Fri Mar 06 07:15:38 EST 2015 | saoasasd

Hi, I have faced some problems with DQFN PACKAGE 132 PIN. After some cross sections and dye pry analysis we could find a head on pillow situation always on inner row pads. The PCBAs are double side and the DQFNs are assembled on Bottom side (Noteboo

Flux waves on PCBs

Electronics Forum | Tue Mar 10 04:36:41 EDT 2015 | vb7007

Hi I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks si

Flux waves on PCBs

Electronics Forum | Tue Mar 10 04:37:32 EDT 2015 | vb7007

Hi I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks si

Flux wave on PCBs

Electronics Forum | Tue Mar 10 04:40:01 EDT 2015 | vb7007

Hi I have been struggling with boards for high quality picky customer. I am getting flux waves (like splashed - too hard to clean) after wave, where as we are still using Kester 979 (No clean flux, but as we are getting visible marks which looks si

Roller tinning machine

Electronics Forum | Sat Apr 04 19:17:23 EDT 2015 | sync40

Hello to everybody. Does someone have some experience or review in the past with roller tinning machines? I mean low cost machines with two rollers and a molten solder tank. The finished soldermasked PCB pass through the rollers (like a lamination)

Help with resources for SMT assembly

Electronics Forum | Sun Jul 26 07:09:25 EDT 2015 | orbitcoms

Thank you for your prompt response. The boards we have made for us current are Immersed Gold treated because we have been hand soldering and needed flat finish that would solder ok without tarnishing too quickly. I will take a look at the link you pr

Halogen-free Solder Re-flow Quality Issues

Electronics Forum | Fri Oct 02 10:34:20 EDT 2015 | dyoungquist

After looking at your profile, some general thoughts.... Your profile looks like what is commonly called a ramp-spike profile and not a ramp-soak-spike profile. Going off of Sarason's comment, you may not have a good soak period before the spike in

Halogen-free Solder Re-flow Quality Issues

Electronics Forum | Fri Nov 06 12:15:19 EST 2015 | derrikf

Also, for anyone who's taken an interest in this thread: We just received samples of Henkel/Loctite's room temperature stable(yes, you read that right), halide-free, lead-free pastes, both the GC 10 and the GC 3W (which is a water soluble/wash paste

Immersion Silver - surface problems (need experienced help)

Electronics Forum | Mon Aug 24 17:58:10 EDT 2015 | warwolf

We have had some test results come back after we were getting poor wetting in our joints, we requested an EDS on our joints from our PCB supplier. They have provided the results and said that it was their fault and will replace. What I want to know


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