Electronics Forum: flux not printed pads (Page 1 of 14)

Waves soldering: not enough solder remaining on pads

Electronics Forum | Tue Jun 06 11:47:33 EDT 2017 | stevezeva

Hi Zac, was that board finished with tin/lead HASL or leadfree/HASL? Also what type of flux were you using? Just because a board is fresh out of sealed packaging doesn't necessarily mean that it's going to solder well. The picture that I've attached

Assemby of flexible printed circuits

Electronics Forum | Wed May 16 15:40:56 EDT 2012 | davef

Here's some notes from a Bob Willis presentation Assembly of Flexible Circuits with Lead-Free Solder Alloy [Bob Willis leadfreesoldering.com] * Flexible Circuit Construction ** Base Material - 0.05mm Copper 18/18 um ESPANEX from Holders Technologies

Waves soldering: not enough solder remaining on pads

Electronics Forum | Fri Aug 04 07:20:10 EDT 2017 | emeto

Zac, for the profile I mean both - if your machine temp profile is inside the process window of your flux. Trying other fluxes might give you some answers.

Waves soldering: not enough solder remaining on pads

Electronics Forum | Tue Aug 01 18:28:47 EDT 2017 | zsoden

Thanks for the suggestions. 1. By this are you referring to the flux specifications or the actual profile of the machine? 2. Yes, the entire machine, the solder pot and the wave nozzles have all been levelled. The better joints on one side are perp

Waves soldering: not enough solder remaining on pads

Electronics Forum | Tue Aug 01 07:24:39 EDT 2017 | emeto

Zac, how about the following: 1. Thermal profile for the flux 2. Is your wave leveled? - If you see better joints on one side, you should probably level the machine 3. Just for elimination, do you have another flux, that you could spray on a board

Waves soldering: not enough solder remaining on pads

Electronics Forum | Tue Jun 06 19:03:59 EDT 2017 | zsoden

Hi Steve, I just confirmed with the manufacturer and the HASL is tin/lead (or it is supposed to be, at least). Any suggestions for how to test for nickel vs tin/lead? We're using an alcohol based no-clean flux from Alpha.

Waves soldering: not enough solder remaining on pads

Electronics Forum | Wed Aug 09 20:06:35 EDT 2017 | zsoden

Thanks Ed. I'll keep that in mind but at this stage I'll rule out the other options such as flux and heat profile first...

Waves soldering: not enough solder remaining on pads

Electronics Forum | Sun Aug 06 19:05:38 EDT 2017 | zsoden

OK thanks. I had assumed that since the soldering was generally smooth and we were having no issues with bridges that the flux would be operating fine. But there really isn't much left to check so I'll get my profiler fixed (the thermocouple has been

Waves soldering: not enough solder remaining on pads

Electronics Forum | Sun May 21 23:29:38 EDT 2017 | zsoden

Hi all, We run an old Seho 1135C wave solder with a 63/37 pot at 250°C. It has been running well for a couple of years but we have noticed lately that all of the larger pads (terminal blocks, transformers, etc.) require additional solder to be appli

Waves soldering: not enough solder remaining on pads

Electronics Forum | Mon May 22 17:54:46 EDT 2017 | zsoden

Thanks for the replies. The single missed lead is a bit odd - we usually have an entire area missed and that's due to the board not sitting properly in the pallet fingers. I figured in this case it was likely due to poor fluxing? We have always str

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