Grounding clamp for pipe

[R Funk]

Phillp in China is on target. The welders at work use Vee Blocks or Vees on workstands for grounding pipes.

This allows easy rotation of the pipe as the weld progresses.

Another hint is they use a power pipe threader as a "lathe" to turn the pipe and use a 4.5" right angle grinder to put nice bevel on the pipe for full penetration welding.

[Hillbillysmith]

R Funk is right. Philip in China hit it. Take a piece of 1/8-1/4 inch plate about 6x12 inches and weld a piece of angle iron to it "V" up. Then take a piece of 2x2 inch of the same material and weld it like a tab on the edge of the angle stock to clamp your ground to. make two of them so that your pipe is level for welding.

[Tom Poole]

Strip a piece of welding cable long enough to go around the pipe. Cut 2 pieces of 3/4" copper tubing about 4" long. Crimp (smash) the pipe onto the ends of the stripped cable. Drape the cable over the pipe and connect your ground clamp. You may have to clean the coating off the pipe to avoid arcing .
This works real well if you are rotating the pipe while you weld.

[Mills]

This thread really helped me with my projects. I never thought about draping a ground cable over the pipe. I do use a c clamp that I welded a piece of angle iron to and use that as a handle to aid in turning it in the v blocks. I started using it as the grounding point but the lead gets in the way usually.