How to Decide Which Type of Flux to Use and How to Use Flux! - Workbench Wednesdays
Flux makes soldering easier; it removes oxide layers, gets contaminants out of the way, and makes for better joints. But there are so many different types of flux, and even more ways to apply it. This video goes over the different types of Rosin (R, RA, RMA), Resin, Organic, and Inorganic flux. Then it shows what kinds of residue get left over from the various types. It also explains why “No Clean" flux actually needs to be cleaned, in most cases. Not sure which flux to use? Check out this video! bit.ly/3QKuBiV
James raises a discussion of soldering flux on the element14 Community: bit.ly/3dzE2mM
Engage with the element14 presents team on the element14 Community - suggest builds, find project files and behind the scenes video: bit.ly/3tmdewv
Visit the element14 Community for more great activities and free hardware: bit.ly/3q6YMpu
Tech Spotlights: bit.ly/3qPrDhM
RoadTest and Reviews: bit.ly/3pV5Bux
Project14: bit.ly/31wbnJY
#0:00 Welcome to Workbench Wednesdays
#0:50 Flux Bases
#1:44 Flux Applications
#3:47 Flux Residue
#5:16 Cleaning (No Clean) Flux
#7:53 Give your Feedback
#solderflux #soldering #solderingtips #solderingiron
outstanding content and production quality! thank you James!
I was looking for this kind of info. Great vídeo!
I bought a few of the pen tip replacements and it's very handy to have!
Great video! As a beginner this answered ALL of the questions I had about flux. I'll likely start with a paste as it seems easiest for tinning the iron. Thanks for the info!
Great! I was recommended lately I should use a different type of flux. I've learnt a lot. Thank you!
THANK YOU SO MUCH! Ive been so confused on which type of flux to use and how to use it
Always love your videos! Been watching them obsessively :)
Great use of optocouplers to isolate the high and low voltages
Wow so thorough! Amazing
That was very informative. I don't know if you did this before, but I would like to see a similar comparison on the types of soldering stations (basic hand held up to hot air).
I've used cheap flux where it's conductive when cold. Gave me a lot of head scratching looking for the short
Stick your multimeter probes in it on resistance and check what you are getting
Thank you! Great video.
thank you James for this informative video, i have learnt a lot from watching it
Can you use open flame on soldering flux
I have a flux pen with a combination of just about everything collected over about 20 years. Rosin, clean, no clean high and regular activity. I prefer rosin core lead solder though because it works good and I like the smell.
Nice, I picked up some of that MG Chemicals 835 liquid flux recently to try. Works really well but boy is it a pain to clean!
I'm a heavy user of the shown chipquick flux, but also have pens and liquid stuff but I pretty much never use them unless for rather special tasks.
Very comprehensive! Thanks for sharing your knowledge.
One thing I noticed that wasn't talked about, is how well solder sticks to metal using certain kinds of flux. I've had very mixed results with different kinds of flux. I've had some that's really sticky and amber in color and it works very well in getting solder to stick where I want. I've had this white paste kind of flux, that barely did anything. Hardly helped the solder stick to what I was soldering and mostly just evaporated. I've had much better luck with the amber sticky type of flux doing the job.
IPA??? Beer? LOL I guess in the soldering world it's Isopropyl Alcohol. What I'm gathering from your video is that any flux will allow any solder to adhere perfectly fine. Cleaning is a no-brainer at least it should be. My project is replacing a micro-usb port on a GPS. The flux I'm using does not help melt the existing solder (which I think is Silver based). But if I'm using a generic 60/40 solder, what flux works best???? Nice video, thank you for the insight.
SMD291 was my favourite too. Now, not available in my country anymore. Only SMD291NL - which stands for No Lead. Any experience with it?
3:53 What is that desk vice called and where can I find one? Or is it a custom 3D print?
I have some Kester 186 flux that's easily ten years old and still works just fine. I think the shelf-life limits of most of these types of things is not something most people have to worry about. Maybe if you're working on a satellite or nuclear reactor control or something, otherwise don't overthink it.
I don't think I have any flux that's quite that old. But I certainly have, and use, 5 year old flux, and that has always worked fine for me.
just found in my basement some old flux labeled from March 2000. Still works! but it's Zinc Chloride based...
You should probably take more time explaining what IPC is, and why you are using their recommendations. If you work with a supplier for solder, flux and cleaning approach, like Kester for example, the flux type in production is largely based on the electronic assembly soldering requirements (like leaded or lead-free solder). In short, if the production assembly work flow requires, SMT reflow soldering, with final hand wire soldering before cleaning, you will select the flux accordingly. Meaning the reflow solder paste flux, wire solder flux and rework flux (usually a liquid brush on) will be the same flux or compatible according to the manufacturer. If the production contract includes field return repair or analysis, then IPC rework procedures are usually adopted with modifications for repair and analysis, with the soldering processes specified which will include the type of flux used. Cleaning flux can be a challenge if you solder devices that can trap flux, like QFPs or BGAs. In specific instances the only way to completely clean the board is to use a heat controlled ultrasonic cleaner with the recommended cleaning fluid (solvent). After cleaning you have to wait until the cleaning solutions evaporates, this may take considerable time at room temperature, so what you will find is to speed up the process, especially after rework to re-introduce the assembly into the production work flow, is to dry the board(s) in an oven (not a reflow oven, a drying oven). Once, the board is dry and stabilized at room temperature can you then test. If the rework involves a BGA one of the first tasks is to x-ray inspect the solder joints. Once the board passes solder inspection, now you can introduce the reworked board into the testing work flow. If you are assembling prototypes for a customer, I would recommend using a very nice looking pad copper plating like immersion gold (unless the contract specifies the plating) and then use an organic flux solder paste and wire, best to use eutectic tin-lead. The organic, water soluble flux, does an excellent job of removing oxidation, and will help migrate the solder completely onto the pad even if the footprint is small (high density), which means the applied paste volume is minimized. Yes you have to clean the boards at elevated temperatures (which is not unusual) in an ultrasonic cleaner, or in a board washer when in production. Or you can just heat up some distilled water to rinse the board if you don't have access to the production line equipment. After rinsing and inspecting that all of the flux is removed, dry the board in an oven, let cool, then test. I find the senior IPC soldering certified assembly technicians for hand wire soldering where you will add additional flux before soldering, usually choose liquid flux as a first choice, and then consider a tack flux if the liquid flux is not viscous enough.
Wow your comment is really appreciated
worth being pinned ^
Chipquick 291 is a decent flux, but it left a residue akin to maple syrup. I did not enjoy cleaning it
I agree. That is my only real complaint. The unactivated flux is very difficult to clean off. But I have also learned that I can use much less than more viscous fluxes and still get good results.
I need flux for high heat, any suggestions??
My dad has a can of flux that's older than I am. It still works. The life expectancy may be a bit over stated.
Lots of good information. Helped me as a noob make some sense of the flux choices!!! Manufacturers are not helping are they!
Wow... had to stop the video to say I really enjoy that intro. Real retro vibes, but concise. Nice!
what is the gel made of? (besides the rosin etc)
You would need to contact Chip Quik. Their MSDS lists the composition as proprietary.
Well because of you I learned that you need to tin the tip XD from this video that is.
Chip quick in a syringe is the best.
I only solder occasionally and use my kid’s left over violin string rosin (he doesn’t play anymore). I just dip the soldering iron tip in it or use a solution of it in IPA. Works actually pretty good.
Yup
I am very surprised that some clarified pine sap from the tree out front is a great working and smelling flux. I boiled it down to a thick paste and can thin it with IPA for brushing. Haven't spent a cent on flux for years.
It used to be so easy!!! Kester 44!!!
How much flux do I need. Ok apply enough to cover the entire area if you can get to the door and not need a scuba kit you need more.
Enough to fill the capacitor /s
My kid is doing eng at well known uni. They did not introduce flux in elec eng units involving soldering. This is how issues start ! DOH !
I don’t think most EE 4 year programs ever introduce soldering, or it’s extremely basic.
Can I use tinning flux in place of rosin flux?
Only if you are soldering pipes for plumbing.
i searched for a video like this since i got my first soldering iron, so i bought my frist random flux wich is like organic ( its like very easy to dissolve hard to clean up) and organic i mean not too much poisonous,im glad with my purchase and i still wanted to watch the video since im not experienced in the art of soldering too much.
Just a comment on smells to think about…. You must have particles of that substance inside your Nose…. to smell it…. Think on that next time you smell a ….. Good info
Wife said the Chipquik smells like celery
how do you dispose of FLUX
no flux given
my favorite type of flux is white petroleum jelly
7:41
I insist that we must say "soldering under flux" instead of "soldering with flux".
If you use flux as an air freshener….. maybe seek help?