Batteries + Jumpercables = DC Welder

Step 2 Alligator Clip Orthodontics

Bend the alligator clip's incisors forward so the canines can grip the rod properly as seen in the 2nd photo.
Strengthen the alligator's jaw muscles with a wrapping of bicycle innertube strip.

Comments

[MillenniumMan]

Alternative to this if you have it, is to use a small vice. If you have a lot of welding to do, and don't want to constantly wrap and unwrap the tubing but want a strong grip on the rod, that's the best way to go.

[jeffgoesboom]

 i think the idea is that the innertube stays on there, it just makes it harder to squeeze therfor clamping down on the electrode harder.