How to use liquid solder flux - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 23rd March 2007, 10:21 AM   #1
Stuey is offline Stuey  Australia
diyAudio Member
 
Join Date: Mar 2006
Location: Perth, Western Australia
Default How to use liquid solder flux

Hi all,

A very simple question; how do you use liquid solder flux on older amp boards when repairing?

I bought the flux as I've had trouble getting the rosin cored solder I normally use to wet on older PCB tracks which I've carefully cleaned up with 800 grit carborundum paper and isopropyl alcohol.

The flux I've bought is an aromatic solvent based one containing rosin, from Cutter Electronics: http://www.cutter.com.au/products.php?cat=9&pg=5

Anyway, do you let it dry, or try to solder while it's still wet, or doesn't it matter?

Cheers

Stuey
  Reply With Quote
Old 23rd March 2007, 02:27 PM   #2
diyAudio Member
 
Join Date: Mar 2007
Location: Canandaigua, NY USA
Not familiar with that one, but it's usually rosin and alcohol. You just brush it on with a small brush and start working. No need to let it dry. IMO, for the best quality work, all flux, including RMA (rosin, mildly activated), should be cleaned off when the board is complete. Use alcohol or a spray solvent made for the purpose- outdoors! FWIW, I once watched a NASA certified solderer come into our plant to do some work on board that were to be launched in a satellite. The person used brush-on rosin flux for all their work, and they did some of the best joints I've seen.
  Reply With Quote
Old 23rd March 2007, 06:59 PM   #3
diyAudio Member
 
Pjotr's Avatar
 
Join Date: Nov 2002
Location: Netherlands
Hi,

I use “No Clean” solder flux as an extra flux for SMD components and rework. You must dry it thoroughly because otherwise it will “sputter”, giving unreliable joints and very small solder spats around the PCB board. With small SMD components these spats gives a risk of shorts.

Cheers
  Reply With Quote
Old 23rd March 2007, 11:46 PM   #4
Stuey is offline Stuey  Australia
diyAudio Member
 
Join Date: Mar 2006
Location: Perth, Western Australia
Hi there,

Thanks for the replies. Yes, I think this one is meant to be a no-clean flux, but I clean my board with isopropyl anyway because of the cored flux I'm using.

Now to get stuck in!

Cheers

Stuey
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solder, Flux, and Cleaning Discussion Hartono Parts 20 11th December 2013 12:43 PM
What solvent for best removal of solder flux? space Everything Else 10 18th April 2007 07:57 AM
liquid problems lop23 Analogue Source 7 14th September 2006 09:15 PM
lead-free solder: shiny when liquid but suddenly it turned dull when it solidified jarthel Parts 3 5th August 2006 06:52 PM


New To Site? Need Help?

All times are GMT. The time now is 04:20 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2