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What is the reason why the welding head of the data line automatic soldering machine can't be pulled out?

Check whether it is too tight first.

You can try the following two ways.

1, soak the welding head in alcohol for a period of time, let the alcohol dissolve the flux, and see if it can be pulled off.

2. Heat the welding head for a period of time, then turn off the power supply, and use pliers to unplug the welding head from the welding pen. Remember not to touch the welding head with your hands in this case, so as not to burn your fingers.