weld or solder to fix broken wire inside motor

[marc_l]

When I was trying to fix a loose wire connection, I broke off the soldered connection, from the bolt/stud that is on the motor.
I took the motor apart and found that the bolt/stud that attaches to the inner wiring coil (not the wire to the brushes) has been separated from the head of the bolt/stud.
The wire that has detached, from the stud head, looks similar to a wire coat hanger.
My question is:

Can I have a 'welder' or 'solder' fix this for me?
Also, does the material need to be special, such as, heavy acid flux, etc.
It seems like an easy fix, but I do not own any welding or soldering equipment and do not no much about that stuff either.
It seems like a soldering gun, with the correct wire material should work, but I am not sure.

Thank you very much for your help!

Marc

[tjequip]

Where are you located Marc?

[marc_l]

Costa Rica