© 2016 Nelson Stud Welding, Inc.
Page 8
All Rights Reserved.
February 2016
Part No. 729-110-042 v1.03
1.1 Nelson NCD+ Welding Modes
There are 2 modes of the CD welding process offered with the NCD+ line of equipment: Contact and Auto-Gap.
Each method has its own uses and set-up requirements. The method you select will be determined by the metals
to be joined, esthetics, strength and fixturing. Nelson Stud Welding can assist you in determining which method
and settings best suit your needs.
1.1.1
Contact Mode Capacitor Discharge Welding
1. Gun is loaded and properly positioned with the stud in contact with the work. Operator takes up the spring
pressure.
2. The trigger is closed the projection tip is flashed off leaving an arc space.
3. The remaining stored energy is discharged across the arc space (Stud and base material are heated).
4. The spring pressure plunges the stud into the work piece.
5. The weld solidifies and connection is complete.
Figure 1.1 Contact Mode
1.1.2
Gap Mode Capacitor Discharge Welding
1.
Gun is loaded and properly positioned with the stud in contact with the work. Operator takes up the
spring pressure.
2.
The trigger is closed and the coil lifts the stud momentarily.
3.
The coil is de-energized. Spring pressure forces the stud to contact the work piece.
4.
Upon contact the projection tip is flashed off leaving an arc space.
5.
The remaining stored energy is discharged across the arc space (Stud and base material are heated).
6.
The spring pressure plunges the stud into the work piece.
7.
The weld solidifies and connection is complete.
Figure 1.2 Gap Mode
