How to weld this thin wire, the wire and the header are not the same spacing

Plug spacing is 0.4MM, your line to weld on it is very difficult. First of all, you have to be a great iron work before you can, otherwise you welded up will also be poor contact. The temperature requirement of the plug is very strict.

If you have to weld, use a thermostat to adjust the temperature of 350°. Welding time should not exceed 5 seconds. Have a very thin copper wire a foot a foot welded, and then your row of wires welded to the copper wire. Welded to be sure to line up the line can not be shorted with the surrounding line, and then glue fixed.