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How to Set Up a Stud Gun for Welding Threaded Arc Studs with a Nelson NS40 Gun

WELDER BRANDS: This setup works for Nelson NS40 stud welder guns.


 STEP 1:Place the Arc Chuck into the Arc Gun Chuck Adaptor.  Hold the Arc Gun Chuck Adaptor and Arc Chuck in one hand and with the other hand lightly hammer or mallet the Arc Chuck to ensure it is seated properly.

 Nelson NS40 Gun with Arc Chuck

STEP 2: Determine the size Nelson Style Arc Foot you need.  

  • Stud Diameter 1/8" - 1/2": Small
  • Stud Diameter 5/8" - 3/4": Medium
  • Stud Diameter 7/8" - 1": Large

STEP 5: Determine the type of Nelson Style Arc Foot you need.  Use a Closed Foot for stud lengths of 2" and shorter.  For longer studs, use a Split foot to ease the loading of the stud into the gun.

Nelson Split FootNelson Closed Foot

STEP 6: Screw the 5/16" Arc Legs into the Nelson Style Arc Foot.  The recess of the foot should face out.  Leave the screws loose until you make your final plunge adjustment. 

Nelson Stud Welder Foot Assembly

STEP 9: Determine the ferrule grip you need. For studs 2" and shorter, use a closed ferrule grip.  For studs longer than 2" use a split ferrule grip.

Ferrule GripFerrule Grip

STEP 7:Insert the Ferrule Grip in the Nelson Style Arc Foot. Tighten the set screws.

Nelson Arc Foot Legs and Ferrule Grip

STEP 7:Slide the foot assembly into the gun so that Arc Chuck sticks out past the foot piece.

 NS40 Gun with Foot Assembly and Arc Chuck

STEP 8: Insert a stud into the Arc Chuck.

Nelson NS40 Gun with Foot Assembly and Arc Chuck and Stud

STEP 11:Adjust the foot assembly so that the stud is centered in the middle of the Ferrule Grip.  Tighten the leg screws.

 Arc Stud Centered in Arc Chuck

STEP 11:Put a ferrule on the end of the stud and make the plunge adjustment.  The plunge is the amount of the stud that sticks out past the ferrule grip not including the flux ball.

  • Loosen the leg screws in the gun.
  • Adjust the plunge.
  • Tighten the leg screws in the gun.
Stud Diameter Plunge
 3/8" & 1/2" 3/16" - 1/4"
5/8" & 3/4" 1/4" - 5/16"
7/8" & 1" 5/16" - 3/8"

 Nelson NS40 Gun with Plunge Definition

If you are looking for internal parts for your Nelson NS40 Stud Gun, an exploded view diagram with links to each part for purchase, click here.