Soldering is an essential skill in building and repairing a quadcopter, RC plane and mini quad (commonly known as racing drones). Soldering is basically joining multiple conductive metal parts together by melting and flowing solder between the joint.
Are you having trouble soldering? Check your solder! Good quality lead solder makes soldering a lot easier, and the issue you are having is normally due to the low quality or lead-free solder you are using.