GMC CEN Arc Welder: Discontinued — What to Buy Instead

The CEN was GMC’s budget arc (stick) welder. GMC’s Australian operation went into receivership in 2008.

The number that actually matters

Not maximum amps. Duty cycle — the proportion of a ten-minute period the machine can weld at a given current before thermal cutout.

Transformer welders of this class typically ran low duty cycles at their top setting. In practice that means a few electrodes and then a wait. For hanging a gate that is fine. For fabricating a trailer it is maddening, and it is the single most common reason people replace a cheap welder with a better one rather than a bigger one.

The second thing that matters is open circuit voltage, which determines how easily the arc strikes and re-strikes. A machine that is hard to start makes a beginner think they cannot weld.

If you still have one

Stick welding is unusually forgiving of old equipment — there is no wire feed to jam and no gas to leak. Check the electrode holder and earth clamp: corroded jaws and a poor earth cause more bad welds than the machine ever does. A clean, tight earth clamp directly on bare metal close to the joint fixes a startling proportion of “my welder is faulty” complaints.

Electrodes are entirely generic. Keep them dry — damp rods cause porosity, and a sealed container matters more than the brand.

What to buy

The Forney Easy Weld 140 MP, linked below, is an inverter multi-process machine: stick, MIG and TIG from one small box. Inverter technology is the meaningful change since this GMC was sold — the transformer is replaced by high-frequency switching, which makes the machine a fraction of the weight and gives a noticeably more stable arc at low current, where thin material is either welded or blown through.

If you only ever weld outdoors on rusty or painted steel, stick remains the right process and a plain stick inverter is cheaper. MIG is easier to learn but hates wind and dirt.