Inverter welders are a lightweight, mobile option for arc welding. Their use of computer technology results in welders weighing less than 15 lb. that produce 150 or more welding amps.

The result: welders that weigh as little as 15 pounds. For example: Lincoln Electric’s Century Inverter Arc 120 has a 70-amp max welding capacity, weighs only 17 pounds and costs $320.

It uses advanced inverter technology for a stable arc that also allows it to weigh just 15 pounds, which makes it especially portable and much lighter than most conventional transformer welders.

The first test proved to be a little underwhelming, and [Cody] had to try something drastic — so he hooked it up to an arc welder to fire the projectile using 22V and 200A.