Electronics Forum: surface tension (Page 11 of 30)

Conductive adhesives vs. Lead-free solders.

Electronics Forum | Thu Jul 20 14:02:28 EDT 2000 | Deon Nungaray

Hi Bob, I know that that conductive adhesives have been considered as a lead relacement in the past, but have been ruled out due to cost and other process issues (surface tension etc..) IBM has extensive development data on the topic and had come up

Non-wetting on 0402 chips capacitors

Electronics Forum | Wed May 09 15:15:52 EDT 2001 | caldon

Your process needs some refining. How long did it take to wet? How much force did it take to break the surface tension? What type of solder was in the solder pot? What type of flux was used? What was the pot temperature? Did you take a cap and p

Re: Reflow glue and past.

Electronics Forum | Thu Feb 10 16:00:31 EST 2000 | Travis Slaughter

I have had cases when it was necessary to run epoxy and paste at the same time. The only good reason I know of to even think about messing with going to this trouble is if the surface tension of the solder melting pulls the part out of alignment. T

Re: reflowing double sided SMT

Electronics Forum | Wed Sep 15 06:14:16 EDT 1999 | Wayne S.

I'm looking for some good articles on reflowing of double sided SMT boards. I'd like to come up with a process for low volume prototyping, but need to understand the do's and don'ts. Hello, you can get some insight by typing in double sided boa

Re: Tombstoning of chip capacitors

Electronics Forum | Tue Aug 24 15:15:43 EDT 1999 | John Thorup

Could use a little help here. Can anyone clarify to me the cause and fix of chip caps/resistors tombstoning following reflow? Any help would be appreciated. Thanks. Most common reason is uneven heating where one side of the component ach

Aqueous Cleaning

Electronics Forum | Fri Jul 30 12:34:34 EDT 1999 | Bob Barr

Very shortly I will be evaluating OA flux and aqueous cleaning to replace our RMA and solvent cleaning process. I am primarily interested in batch aqueous cleaners for reasons of budget, floor space, etc. I am concerned about the ability of H2O to

Re: REFLOWING 2 SIDED SMT BOARDS

Electronics Forum | Tue Jul 13 09:16:13 EDT 1999 | Dick Casagrande

WOULD LIKE TO DO RELOW OF 2 SIDED SMT BOARDS. USUALLY THE BOTTOM SIDE HAS RESISTORS AND CAPS ONLY. WHEN THE BOTTOM OF THE BOARD HEATS UP, THE PARTS ARE FREE TO MOVE AND ONLY SURFACE TENSION WILL KEEP THE COMPONENT FROM FALLING OFF. CAN BOARDS BE

Re: Bottom side smt and thru hole

Electronics Forum | Wed May 27 10:19:43 EDT 1998 | Jerry

We have no problems but orientation does matter. Orient with longest side of component body perpendicuar to wave. In other words the same preference as with through hole DIPS. Idea is the same as for through hole, that the surface tension will ten

Wave Soldering - Icicling/Bridges

Electronics Forum | Tue Jan 28 17:10:21 EST 2003 | sajulius

I've seen this problem on more than one wave,What i've done is to run the conveyor a little faster,use a solder temp of 505 degrees F,and most important is to make sure that the solder is flowing over the back. this will keep the thin buildup of dros

Why measure O2 ppm level in N2 environment

Electronics Forum | Wed Mar 05 08:12:56 EST 2003 | nifhail

Hi Mike, How do we measure the O2 ppm in N2 environment. I don't understand why the customer keep insisting me to use N2 instead of Air. I don't see the need for it as I done have any soldering issue. Can you share with me why N2 is needed at the fi


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