Electronics Forum: flux process on leadframe (Page 1 of 14)

Excess wave flux on lead free process

Electronics Forum | Thu Mar 17 03:07:17 EST 2005 | Chua

Hi, We are running lead free at wave solder now and the spray flux system is down. If we are going to able the flux manually, what problem will we be facing with the excess flux able. Appreciate for the advise.

Excess wave flux on lead free process

Electronics Forum | Thu Mar 17 22:14:42 EST 2005 | Chua

Hi Davef, Thanks for your advise...... We are running no-clean process. If there is white residues after few days.....is it cause by those excess flux. Thanks

Excess wave flux on lead free process

Electronics Forum | Thu Mar 17 10:14:30 EST 2005 | davef

If you're washing the boards properly, you should see any problems, maybe a little extra floaming, but that won't be too bad. If you're running no clean, you need to aplly flux according to your supplier's recommendations. If you decide not to foll

Excess wave flux on lead free process

Electronics Forum | Thu Mar 17 22:47:29 EST 2005 | davef

That would be our first guess, also. Get the stuff analyzed to be sure. Another clue is if the white stuff disappears when you hit it with hot air from a rework station. The hot air is activate the flux. Good troubleshooting tool, but you're subj

Questions on underfill process

Electronics Forum | Fri Jun 08 15:37:41 EDT 2007 | ck_the_flip

Jim: I have limited knowledge, but here's what I know: 1. Yes, it's a standard process. In today's SMTNet, it's rarely mentioned, and few people reply to postings. 2. Nope. It's a "specialty" piece of equipment for most CEM's. Depending on you

flux on PCB's after cleaning

Electronics Forum | Wed Jul 21 17:49:52 EDT 2004 | jsk

problem: Too many solvents and boards are not clean Flux remains on the board after vapor degreaser and "Powdery" white residue after vapor degreasing Flux type is kester 186 Process: hand solder High Temp alloy, spot clean after hand solder e

flux on PCB's after cleaning

Electronics Forum | Fri Jul 23 14:41:41 EDT 2004 | Steve Stach

Dear JSK, It sounds like the root causes of your problem are two fold. First, excessive heat will polymerize the abietic acid found in rosin forming neo-abietic diamers and polymers which are much less soluble than the parent monomer. There are

Wes' question on VOC-FREE flux

Electronics Forum | Wed May 19 11:01:17 EDT 1999 | Vince Whipple

Wes, I have been involved with many customers changing over from an alcohol based no-clean to a VOC-free process. The change-over can be made easier by such things as air movement, convection preheat, "drains" or reliefs in pallets (if used), contr

Solder balls on Cleaned process

Electronics Forum | Thu Oct 18 11:20:21 EDT 2001 | davef

Ooooo, you do have the toys, baybeee!!!! This really is not a good situation. * Leaving this OA flux res on your boards will surely affect the LT performance of your product. * That a rookie found this by noticing solder balls all over the seconda

Solder balls on Cleaned process

Electronics Forum | Wed Oct 17 17:43:27 EDT 2001 | davef

2) Open time: A 15-minute queue between paste, place, and reflow SB fine, assuming humidity is not too great. 3) Wash temperature: Yes. A wash temperature of 130-140�F SB fine. 4) Reflowed board was left too long prior wash: Are you washing: * After

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