What does 60% duty cycle at 200 A mean?

The machine can weld at 200 A for 6 minutes out of every 10, then needs to cool.

Can an inverter run on a generator?

Yes, if the generator is large enough and gives stable power; check the maker's advice.

Is DC better than AC for stick welding?

DC gives a steadier arc and less spatter, and is needed for many low-hydrogen and stainless electrodes.

Arc welding machine: inverter, transformer, current

An arc welding machine supplies the high current needed for stick (MMA) welding with flux-coated electrodes. Older transformers give AC and are heavy but rugged; rectifiers give DC; modern inverter machines are light, efficient and give a smooth DC arc. Machines are chosen by current range and duty cycle, which decide the electrode sizes and how long you can weld without stopping.

Quick facts

Types: Transformer (AC), rectifier (DC), inverter (DC)
Current: About 100–400 A common
Electrodes: About 2.5–5 mm (0.0984–0.197 inch) for most work
Duty cycle: Per cent of a 10-minute period it can weld at a given current
Power: Single phase for small machines, three phase for larger ones
Extras: Many inverters also do TIG (lift arc)

Which type

	Transformer	Rectifier	Inverter
Arc	AC	DC	DC, smooth
Weight	Heavy	Heavy	Light
Power use	High	Medium	Low
Best for	Rough general work	Steady workshop use	Site work, low-hydrogen rods

Choosing current

Electrode size	Approx. current
2.5 mm (0.0984 inch)	About 60–100 A
3.15 mm (0.124 inch)	About 90–140 A
4 mm (0.157 inch)	About 130–190 A
5 mm (0.197 inch)	About 180–250 A

Typical ranges; follow the electrode maker's packet.

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Questions

What does 60% duty cycle at 200 A mean?: The machine can weld at 200 A for 6 minutes out of every 10, then needs to cool.
Can an inverter run on a generator?: Yes, if the generator is large enough and gives stable power; check the maker's advice.
Is DC better than AC for stick welding?: DC gives a steadier arc and less spatter, and is needed for many low-hydrogen and stainless electrodes.

The figures on this page are typical values for guidance, written by Diemeco from standard engineering practice. They are not a specification: confirm grades and properties with the relevant standard or the supplier's mill test certificate, and tolerances with your workshop. Last checked 29 October 2026.