Best 4 in 1 Welder (2026): 5 Multi-Process Picks Scored

A 4 in 1 multi-process machine combines Gas MIG, gasless flux core, Stick, and Lift TIG welding in a single portable inverter. Choosing the best 4 in 1 welder comes down to matching output amperage, duty cycle, dual-voltage flexibility, and wire drive capabilities to your shop projects. This guide compares five top models from our welders coverage based on manufacturer specifications to help you find the right machine for home, farm, and auto repair.

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Compare the picks

Specifications are manufacturer rated, as published on each listing and collected 9 October 2026.

The picks

Award	Product	Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›
	FEMEROL 200A MIG Welder,4 in 1 Gas MIG/Gasless	7.5/10	Check price on Amazon
	ANDELI 4-in-1 MIG Welder with 2.4GHz	7.4/10	Check price on Amazon
	BESTMIG 165H MIG Welder 110V/220V,4 in 1 Gas	7.0/10	Check price on Amazon
	BESTMIG 165S MIG Welder 110V/220V Dual Voltage	6.7/10	Check price on Amazon
	Bestarc 165A MIG Welder, Flux Core/Gas MIG Stick	6.3/10	Check price on Amazon

1

FEMEROL 200A MIG Welder,4 in 1 Gas MIG/Gasless

FEMEROL · 7.5/10 Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 200A dual-voltage inverter rated for steel up to 8.0 mm, supporting .023 to .035 wire with synergic control and a large LED screen.

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Pros

• Highest output current in this group at up to 200A
• Listing states capability on mild plate up to 8.0 mm
• Accepts .023, .030, and .035 solid and flux core wire
• Synergic and manual controls with an interactive digital LED screen

Cons

• Lift TIG torch is not included with the package
• Heaviest machine here at 29.8 lb
• Duty cycle at 200A is not stated in the listing
• No electrical safety certification such as ETL or UL is listed

2

ANDELI 4-in-1 MIG Welder with 2.4GHz

ANDELI · 7.4/10 Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 145A dual-voltage multiprocess machine featuring a 2.4GHz wireless remote control, 4.1-inch shielded LED screen, and adjustable inductance.

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Pros

• Wireless 2.4GHz remote control operates up to 10 m away
• Adjustable inductance control helps stabilize the arc
• 4.1-inch LED display has a transparent protective cover
• Rated for steel thickness up to 6 mm, about 0.24 inches

Cons

• Lowest maximum output in the group at 145A
• No warranty term is stated in the listing
• No duty cycle rating is stated in the listing
• No electrical safety certification such as ETL or UL is listed

3

BESTMIG 165H MIG Welder 110V/220V,4 in 1 Gas

BESTMIG. · 7.0/10 Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 165A dual-voltage welder built to accept 2 lb and 10 lb wire spools, packaged with a detachable torch and a 180-degree panoramic helmet.

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Pros

• Accommodates both 2-pound and 10-pound spools of welding wire
• Includes both V-type and K-type wire feed drive rollers
• Detachable MIG torch design simplifies storage and replacement
• Package includes an auto-darkening helmet with 180-degree view

Cons

• Lift TIG torch is sold separately and not in the box
• Listing spec table is empty, omitting machine weight and dimensions
• No warranty term is stated in the listing
• No electrical safety certification such as ETL or UL is listed

4

BESTMIG 165S MIG Welder 110V/220V Dual Voltage

BESTMIG. · 6.7/10 Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A compact 12.5 lb multiprocess machine delivering up to 165A with a 60% rated duty cycle, synergic ±3V tuning, and 2T/4T trigger latching.

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Pros

• Listing states a 60% rated duty cycle at up to 165A
• Lightweight inverter design listed at 12.5 lb with shoulder strap
• Synergic control offers ±3V micro-tuning adjustments
• Stick mode includes Hot Start, Arc Force, Anti-Stick, and VRD

Cons

• Listing contradicts itself, listing 12.5 lb in bullets and 12.1 lb in specs
• Spec table lists 110 volts despite dual voltage claims in the title
• No warranty term is stated in the listing
• No electrical safety certification such as ETL or UL is listed

5

Bestarc 165A MIG Welder, Flux Core/Gas MIG Stick

bestarc · 6.3/10 Gear Score About the Gear ScoreThe Gear Score runs from 0 to 10 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we pick ›

A 165A dual-voltage inverter offering synergic control, 2T/4T modes, and included contact tips and wire spools for gas and gasless welding.

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Pros

• Dual-voltage 110/220V inverter with 165A maximum output
• Includes both 0.030 solid wire and 0.040 flux cored wire
• Synergic control supports voltage micro-tuning between -3V and +3V
• Supports 2T spot tacking and 4T continuous seam modes

Cons

• Listing package contents contradict the title by naming a MIG145 welder
• Weight contradicts between 13.7 lb in bullets and 22.8 lb in specs
• No warranty term is stated in the listing
• No electrical safety certification such as ETL or UL is listed

How we scored them

Each welder is scored out of 100 on performance, build, value, safety listing, and warranty, using the evaluation criteria outlined on our How We Pick page. None of the five listings publishes a third-party electrical safety certification such as ETL, UL, or CSA, so every machine here scores zero on that criterion; the ranking comes from the other four.

Buying guide: how to choose the best 4 in 1 welder

Amperage output and metal thickness

Amperage directly dictates the thickness of steel a machine can fuse in a single pass. In this group, maximum output ranges from 145A on the ANDELI up to 200A on the FEMEROL. The FEMEROL rates its maximum capacity at 8.0 mm mild plate, while the ANDELI rates for 6 mm (0.24 inches) and the BESTMIG 165S lists up to 3/16 inch. For welding 1/4 inch steel in a single pass, a 200A output on 220V power provides the necessary penetration.

Dual voltage flexibility: 110V versus 220V

All five welders in this comparison feature dual-voltage capability, allowing operation on standard 110V household outlets or 220V shop power. Running on 110V power provides convenience for portable household repairs but limits output amperage and arc penetration. Connecting to a 220V power supply is required to achieve the full stated output, such as 165A or 200A, and maximum duty cycle.

The four welding processes

A 4 in 1 machine provides Gas MIG (GMAW), gasless flux-cored wire (FCAW), Stick (MMA), and Lift TIG. Solid wire MIG requires an external shielding gas cylinder and hose for clean spatter-free beads on clean steel. Gasless flux core uses tubular wire with internal flux, making it portable and suitable for windy outdoor conditions. Stick welding handles thicker, rusty, or painted steel, while Lift TIG provides control for thin sheet and precise joints, though TIG torches must often be purchased separately.

Synergic control versus manual tuning

Synergic programming automatically matches voltage and wire feed speed to the selected amperage, simplifying setup for beginners. Several models here, including the BESTMIG 165S and Bestarc MIG165, include voltage micro-tuning between -3V and +3V to fine-tune arc characteristics. Experienced operators can switch to manual mode to independently adjust voltage and current for specific weld joints.

Wire spool size and drive rollers

Most compact welders accommodate standard 2-pound wire spools, suitable for occasional repairs and light shop jobs. The BESTMIG 165H stands out by supporting both 2-pound and 10-pound spools, reducing wire cost per pound and saving time on larger projects. Wire drive rollers must match the wire type: V-groove rollers feed smooth solid wire, while knurled or K-groove rollers feed softer flux-cored wire without crushing it.

Use as directed. Welding produces intense ultraviolet radiation, toxic fumes, electrical hazards, and hot spatter. Always wear an auto-darkening welding helmet, flame-resistant leather gloves, and protective clothing. Ensure proper ventilation, especially when using gasless flux-cored wire, keep flammable materials away from the work area, and inspect ground clamps and leads before striking an arc. Consult each machine’s manual for operating limits and check our welding safety gear hub for protective equipment guidance.

Frequently Asked Questions

What is a 4 in 1 welder?

A 4 in 1 welder is a multi-process machine combining Gas MIG, gasless flux core, Stick, and Lift TIG welding in one power source. These units allow users to switch processes depending on the metal type and whether work happens inside a shop or outdoors. Most compact units use inverter technology to maintain portability while operating on 110V or 220V power.

What size welder to weld 1/4 steel?

Welding 1/4 inch steel in a single pass with MIG generally requires at least 180A to 200A on 220V power. In this group, the FEMEROL 200A explicitly rates its capacity up to 8.0 mm mild plate, which exceeds 1/4 inch thickness. Machines delivering 145A or 165A can weld 1/4 inch steel by beveling the joint edges and running multiple passes.

What size mig welder for 1/4 steel?

A 200A MIG welder running on a 220V circuit provides the current and heat penetration needed for 1/4 inch steel plate. Units with lower outputs, such as 145A or 165A, require proper joint beveling and multi-pass technique to achieve sound penetration on 1/4 inch material. Always check the manufacturer’s stated thickness limits before starting heavy fabrication.

What size welding rod for 1/4 steel?

The listings in this roundup do not state specific welding rod sizes for Stick welding 1/4 inch steel. Machine manuals typically recommend matching electrode diameter to the available amperage and joint thickness on 110V or 220V power. Always consult the machine’s technical manual and door chart for electrode diameter recommendations.

What is a 1/4 fillet weld?

A 1/4 fillet weld is a weld with a nominal leg size of 1/4 inch joining two metal surfaces at roughly a right angle, such as in a T-joint or corner joint. Making a full 1/4 fillet weld in a single pass requires sufficient heat input, which 200A machines can achieve on 220V power. On lower-output welders, completing the weld requires multiple passes to deposit the full leg size.

Related: best multi-process welder, best welder for beginners, 120V vs 240V welder, and the multi-process welders hub. Also see our guide on flux core vs MIG welding. Also see our guide on welding duty cycle explained. Also see our are multi process welders good. Also see our is a multi-process welder worth it. Also see our how to switch polarity on a multi-process welder. Also see our multi-process welder vs dedicated mig welder.

About the author

WeldGearLab Editorial

WeldGearLab Editorial is the editorial team behind WeldGearLab. We research product listings, specifications, safety listings and warranty terms, score every pick with the published Gear Score method, and correct errors when readers report them. We do not run our own shop trials; see How We Pick for exactly how picks are made.