© 2016 Nelson Stud Welding, Inc.
Page 9
All Rights Reserved.
February 2016
Part No. 729-110-042 v1.03
1.2 NCD+ Guns
This manual covers the Auto-Gap weld gun. This gun can be used for Auto-Gap and Contact style welding
applications.
1.2.1
Operation of the Auto-Gap Gun (Gap Mode)
The NCD+ Auto-Gap gun is a capacitor discharge lift gun. There are two wires in the control cable that go to the
gun coil and two wires that go to the trigger. When the trigger is pulled, the stud rises off the workpiece. The gun
de-energizes and the main spring then pushes the stud back towards the workpiece. The arc begins once the
stud contacts the work.
1.2.2
Operation of the Auto-Gap Gun (Contact Mode)
The NCD+ Auto-Gap Gun can also be used as a capacitor discharge contact gun. The coil does not lift the stud in
this application. When the trigger is pulled, the capacitors discharge as the stud is held firmly against the
workpiece. The tip is flashed off, that establishes an arc and allows the stud to plunge.
