Frequently asked questions

A 120-volt flux-core wire-feed welder. It runs on a standard household outlet, needs no shielding gas bottle, and has two controls: voltage and wire speed.

You can be laying a bead within an hour of opening the box, and nothing else has to be bought first. That is Level 1 on this site.

Level 1 is anyone who has never struck an arc. Level 2 is someone who can lay a bead and is tired of chipping slag. Level 3 is someone who wants aluminum or wants the weld to look deliberate. Level 4 is someone whose bottleneck is cutting rather than joining.

Each move up has a specific trigger, and it is always a frustration rather than an ambition.

No, and this is the most expensive mistake in the category. A 240-volt machine you cannot plug in is worth nothing until an electrician has run the circuit, and a multiprocess machine with five modes gives a beginner five ways to be confused rather than one way to succeed.

Buy for the level you are at plus one.

For true MIG with solid wire, yes — the gas is the shielding. But most machines sold as MIG welders also run self-shielded flux-cored wire, which needs no gas at all.

So you need gas only if you want the cleaner, slag-free weld that gas MIG gives you.

It comes from the machine's rating plate — its rated input amperage, which is a very different number from its advertised output. A typical 120-volt wire-feed welder specifies a 20-amp circuit; 240-volt machines commonly specify 30 to 50 amps.

Have any circuit work done by a licensed electrician to the National Electrical Code and your local rules.

Most commonly because the circuit is 15 amps rather than the 20 the machine specifies, or because it is shared with other loads such as a freezer.

A long or thin extension cord makes it worse by adding voltage drop, which raises current draw. Try the machine on a known-good dedicated circuit with no extension cord before concluding anything is faulty.

No. There is no self-shielded flux-cored wire for aluminum, and no setting makes a flux-core machine weld it.

Aluminum's oxide layer needs either AC output or a pure argon shield to break up, and flux-core provides neither. MIG with a spool gun works for thicker utility aluminum; AC TIG is the proper answer.

It depends on process and current. For MIG or flux-core at 60 to 160 amps, OSHA's minimum protective shade is 10. For TIG under 150 amps it is 8, and for light plasma cutting it is 8.

Most people run one shade above the minimum for comfort. Our shade chart reproduces OSHA's full table.

Yes. AWS classifies E71T-11 flux-cored wire and ER70S-6 solid MIG wire in the same 70,000 psi tensile class, and a correct weld in either is stronger than the mild steel around it.

What differs is which process makes a correct weld easier to achieve in your conditions.

If there is slag, you drag. Flux-core and stick both produce slag, so you pull the gun away from the finished weld. Gas MIG on mild steel has no slag, so you push.

Pushing a slag process drives slag into the joint ahead of the arc and gives a shallow, contaminated weld.

Self-shielded flux-core runs DCEN, electrode negative. Solid-wire gas MIG runs DCEP, electrode positive. On most machines you physically swap two leads inside the wire compartment.

Running the wrong polarity gives heavy spatter, poor penetration and an unstable arc — and it is the single most common reason people think a new machine is faulty.

About a quarter inch of mild steel in a single pass, across the whole class. That is a limit of the household circuit rather than of any particular machine.

You can exceed it with a bevelled joint and multiple passes, but if quarter-inch-plus is your normal work you want 240 volts.

For galvanized, stainless, painted or coated metal, and for any flux-core work in an enclosed space, yes.

Two limits matter: a particulate respirator does not remove gases, so ventilation is still required with one on, and it only works with a proper seal against clean-shaven skin.

In priority order: an auto-darkening helmet with four sensors and an ANSI Z87.1 marking, an angle grinder with flap and cut-off discs, thick gloves, wire or electrodes, and more clamps than you expect.

The welder is typically about two-thirds of the real cost of starting.

Because there is no live price feed for this site, so any figure we printed would be a snapshot we could not keep current — and a stale price misleads in a way readers cannot detect.

Every buy button reads "Check price on Amazon" and links to the current figure at the retailer.

No, and we say so on every page. There is no test lab and no workshop full of loaned welders.

Our picks are built from published manufacturer specifications, duty-cycle and amperage arithmetic, and the pattern of owner feedback across retailers. How We Pick sets out the method in full.

A numeric score implies a measurement, and we have not measured these machines.

Instead every pick carries a one-line verdict, an explicit statement of who it is for by level, and at least one genuine weakness. For the same reason this site emits no Review or AggregateRating structured data.

Affiliate commission. Arc & Bead is an Amazon Associate, so if you buy through a link here we may earn a commission at no extra cost to you.

It does not decide recommendations — on several pages the honest answer is the cheapest machine, and on one it is an angle grinder instead of the product the page is about.

Tell us. Every technical figure here is attributed to a manufacturer's documentation or a standards body, so a wrong figure is checkable.

Email contact@arcandbead.com with the page and the figure, and we will check it against the source and correct it if it is wrong.