The second electromagnetic wire has a proper length for shaping;

Third, whether butt joint or splice joint, the thread end should be at least 5 cm long.

The fourth welding should be smooth and consistent, so as not to puncture the insulation and cause short circuit of the coil.

The fifth set of insulating tubes, tidy up the ends.

If it is below 10A, it can be welded; If it is above 10A, it can be welded by collision welding machine or tin welding.