NS20A & NS20N Heavy Duty Gun Page 7 Revision 1.20 2/19/08
SEQUENCE OF OPERATIONS
Welding Gun
1. Mainspring (1) is partially compressed and
lifting rod (5) slides through lifting ring (4)
when the gun is placed in weld position as the
plunge is taken up.
2. Pressing gun trigger button energizes gun coil
(2).
3. The gun coil (2) pulls back the movable core
assembly (3), causing the lifting hook of the
movable core assembly to lock the lifting ring
(4) on the lifting rod (5).
4. At the same time, the lifting ring spring (6) and
core spring (7) are compressed.
5. The cocked ring locks on the lifting rod, and
the movable core assembly "lifts" or pulls back
the entire assembly, including the chuck and
stud (Figure 6).
6. When the stud is "lifted" from the work, an arc
is initiated.
7. The assembly remains "lifted" for a preset weld
time.
8. At the end of this time period, the gun coil (2)
is de-energized.
9. The movable core assembly (3) is returned to
normal position by the core spring (7).
10. The lifting ring (4) is uncocked by the lifting
hook and lifting ring spring (6).
11. The mainspring (1) returns the assembly to
normal position, and this action “plunges” the
molten end of the stud into a pool of molten
metal on the base plate, thus completing the
weld.
Figure 5: Gun mechanism in normal
position
Figure 6: Gun mechanism in lifted position
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