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𝔎𝔦𝔯𝔞 , 08-13-2026, 02:03 PM

I had previously bought a cheap sokder iron pen and right now when I want to solder s teanded wire onto a USB C PD module it just doesn't want to melt even though I put so much flux. I think it is the quality of the solder pen, it has a rotating temperature adjust but I doubt it's good quality.

Should I buy those with the big box for temperature control? how much easier does it make soldering?

, 08-13-2026, 02:13 PM

🤖 In the meantime, here’s a response from the [FEDEVEL AI HW Assistant]().
It helps to find relevant resources for your question, but it may make mistakes as it’s still in early development.

This is the response from the AI Assistant:
The problem you're experiencing is common with cheap soldering irons. Here's what you need to know from the video content:

1. **Temperature Control Matters**: A proper soldering station with accurate temperature control makes a significant difference. The videos show that even a basic $40 station with temperature adjustment (like the one mentioned [here](https://www.youtube.com/watch?v=I_MNw4EWer0&t=5329)) works better than unregulated pens. USB-C PD modules often have large copper areas that act as heat sinks - you need sufficient thermal capacity to overcome this.

2. **Thermal Mass is Key**: Better stations use higher-quality tips with proper thermal mass to maintain temperature during soldering. The "big box" stations you mentioned provide stable power delivery and temperature feedback, preventing the tip from cooling when touching large components/pads.

3. **Lead vs Lead-Free Consideration**: If this is for prototypes/hobby use, consider using leaded solder (SnPb). As shown in [this video](https://www.youtube.com/watch?v=WY3uhITECK8&t=1), leaded solder melts at 183°C vs 217°C+ for lead-free, making it easier to work with lower-quality irons.

4. **Technique Adjustment**: Even with a better iron, ensure you're:
- Cleaning the tip regularly
- Using adequate tip size (larger tips store more heat)
- Tinning the tip before use
- Applying heat to both the pad and component lead simultaneously

A mid-range station (~$80-150) with replaceable tips and digital temperature control will make soldering power components like USB-C PD modules significantly easier.

, 08-13-2026, 02:13 PM

The temperature stability and thermal recovery time are what you're paying for - it's worth the investment if you plan to continue working with electronics.

You can continue chatting with the AI Assistant here:
https://fedevel.com/hw-assistant

QDrives , 08-13-2026, 02:16 PM

Flux does not help the solder melting. That is purely a temperature (and power) thing.
What you want to solder does not need high power, so that leaves temperature.
Also keep in mind that there are many different types of solder with different melting points. Make sure it is not a high melting point solder that you have.

Robert Feranec , 08-15-2026, 08:41 AM

the USB and pen soldering stations can somehow work but are not the best tools. Some time ago I made a survey on my linked in ... so I would recommend to buy one of these brands or some people also recommended Metcal or Hakko

Robert Feranec , 08-15-2026, 08:42 AM

here is link to the post so you can read the comments: https://www.linkedin.com/posts/robfer_help-me-find-out-which-soldering-stations-activity-7388378681460592642-iWFq?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAOsOkcBmNifaB487EG9BUTzXYI6dDSBYlc

𝔎𝔦𝔯𝔞 , 08-15-2026, 01:59 PM

from my research since I made this post, I discovered that the current meta for soldering are the ones using T12 tips

what separates a good quality solder pen from a bad quality solder pen is the temperature control feedback loop
like there needs to be a separate dedicated microcontroller box that can sense the solder tip temperature and push more current when it loses heat (heats other metal)

𝔎𝔦𝔯𝔞 , 08-15-2026, 01:59 PM

so for low quality one the one im using i observed that the lead will not melt on the PCB probably because there is a copper plane which is sucking all the heat away from the solder tip, so it isnt hot enough to melt

𝔎𝔦𝔯𝔞 , 08-15-2026, 02:00 PM

on traditional solder pens they are called 900M its a ceramic inside a hollow cylinder with some air gap which makes it horrible for temperature sensing

𝔎𝔦𝔯𝔞 , 08-15-2026, 02:01 PM

but T12has the ceramic, outer metal shell and the thermostat very close to each other

𝔎𝔦𝔯𝔞 , 08-15-2026, 02:01 PM

improving its efficiency

QDrives , 08-16-2026, 12:38 AM

If your board is lacking thermal relief, it is not the temperature control.
Most important is higher power.
Second bigger tip helps.
But all that is moot when without skills.
Thermal relief is a must for easy soldering.

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:13 PM

the solder pen i have is lousy, it has a rotating dial on the pen itself and a single wire that connects to a AC plug

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:13 PM

I had just ordered a T12 station one

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:13 PM

the product says it needs a 24V 5A dc adapter as well

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:14 PM

so there probably isnt any closed loop system

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:14 PM

garbage

𝔎𝔦𝔯𝔞 , 08-16-2026, 08:15 PM

cant wait to try out the t12 one though

Robert Feranec , 08-17-2026, 10:09 AM

good tip makes difference - for example when I used JBC tip on my cheap FNIRSI USB-C soldering iron it makes difference (they look the same, but they are not), but it is never as good as my Weller with bigger tip and much better thermal characteristics. I tried to check T12 on internet, but there are many types - most of them is not a very big one, so I would not be surprised with performance when working with power planes. Also, as @QDrives mentioned - in some cases the problem may be PCB itself and it may be hard to solder it even with a good soldering station.