I have a circuit board that no matter what I do, solder wont stick to it. I don’t have much experience in soldering, but I have soldered before, and most recently today. But this one specific circuit board I have has proven to be very difficult. I am using solder with flux core. The pads are clean and show no sign of oxidation. This is the board.
You could try a bigger tip and more heat, but you’ll need to be pretty confident in your technique. There’s a somewhat inexpensive iron that may yield decent results called the “Pinecil” if you’re willing to wait for it to arrive rather than chancing the higher heat setting and/or changing tips. Also, it may help to use a flux pen instead of relying solely on the flux core.
You’ve got to time travel back 30 years and get one of these Dick Smith soldering irons or something that’s greater than about 60 watts and temperature controlled. You need the power so the tip of the iron doesn’t go cold when you try to solder the very conductive high current pads. That way you don’t need to go to extreme temperatures and damage the circuit board or components.
Yes, it looks like the WX series uses active tips. Not worth the money at that price. I use a Pace branded station of similar design and paid about 1/4 that for it here, but it’s a US company and may be difficult to source for you.
The station you posted last will do just fine. Try to find an assortment of replacement tips. They aren’t usually expensive.
There’s also this 100w iron from RND lab, it costs the same as the 70w Weller. At this price point, finding easily available replacement tips is a priority. Which one would you recommend, Weller or RND lab? How many mm should the chisel tip be?
Use as much solder paste as you can.
If you find it, use the best solder paste available: “Amasan Lötfett”.
After applying some paste on the surface, use solder to shine the surface up.
Apply the paste and shine the power wire up with solder, too.
Then solder the wire and surface together.
Get some 63/37 solder if you are using 60/40. It’s a bit easier to work with and generally less chance of a cold solder joint. And as @Mustafa_Gokce says use flux generously. Get some past, liquid and a pen. It can also help to lightly polish the solder pad (I use a pencil eraser) to remove any oxidation before soldering. But 1st a higher wattage iron.
I bought a more powerful iron and solder now sticks to the board without problem. My concern is, the awg 14 wires are very thick and it’s difficult to not make contact between pads. What’s the best way to verify no small particles of solder are touching between pads?
Would it be safe to use awg 16 for soldering esc? Current load will be 25-27 amps. Cables are very short. Around 8cm.
Also, can I skip pads? The board has Ground, B+, B+, Ground. Can I for instance do, Ground, skip first B+, solder second B+? This way there will make it easier to solder thick wires