MIG vs TIG Welding: What’s the Difference?

Welder in protective helmet and gloves MIG welding steel beams, with bright arc and orange sparks flying in an industrial workshop

TIG and MIG welding are the two processes contractors reach for most on Australian construction and mine sites. MIG runs a continuous wire feed for fast, high-volume joins on thicker steel, while TIG uses a non-consumable tungsten electrode for a slower, more controlled weld on stainless steel, aluminium and thinner materials.

Which process wins depends on the material, the joint and the finish the job demands. We compare TIG vs MIG welders below, then browse our welder hire options to find the right machine for the job.

What Is MIG Welding?

MIG welding feeds a continuous wire electrode through a handheld gun while a shielding gas protects the weld pool from contamination. It’s usually the first process contractors use, because it’s quick to learn and forgiving on thicker steel.

On a construction site, MIG suits structural steelwork, framework assembly and general fabrication, where speed and strength matter more than a mirror finish. A competent operator can run a long, continuous bead across a structural section with minimal stop-start, which keeps labour-intensive jobs on schedule.

What Is TIG Welding?

TIG welding, also known as GTAW (gas tungsten arc welding), uses a non-consumable tungsten electrode and a separate filler rod, giving the operator close control over heat input and weld pool. It produces a cleaner, more precise weld than MIG, with far less spatter.

That control comes at a cost. TIG is slower, and it demands a more experienced operator working the torch, filler rod and foot pedal together. It’s the process of choice for stainless steel, aluminium and thin-gauge material, and for welds that need a visible, certification-grade finish, such as pipework.

Split image comparing MIG welding with bright spark spray on the left, and close-up TIG welding with a filler rod and steady blue-white arc on the right

TIG vs MIG Welding: Quick Comparison

The table below sets out how MIG and TIG welding stack up against each other on the factors that matter most on a construction or mine site.

FactorMIG WeldingTIG Welding
SpeedFast, continuous wire feedSlower, more controlled
Skill levelQuick to learnRequires an experienced operator
Material thicknessThicker structural steelThin-gauge and precision work
Weld finishStrong, functional beadClean bead, minimal spatter
Best metalsMild and carbon steelStainless steel, aluminium, thin steel
Typical site useStructural framing, fabricationPipework, visible and critical welds

When Should Contractors Use MIG Welding?

Reach for MIG when the job calls for speed and volume. It’s the standard choice for structural steel framing, site fabrication, plant repairs, and any application joining mild or carbon steel quickly and reliably.

Because the wire feed runs continuously, MIG also handles longer welds without the stop-start of changing filler rods, which counts when a crew is working to a tight program.

When Should Contractors Use TIG Welding?

TIG earns its place on site when the finish, the material or the certification requirement rules MIG out. Stainless steel handrails, aluminium fabrication, thin-gauge sheet metal, and pipe welds that need to pass a visual or NDT (non-destructive testing) inspection all call for the tighter control TIG offers.

It’s not the process for high-volume structural work, but for welds that have to be right the first time, the extra time on the tools is worth it.

What About Stick and Flux-Cored Welding?

MIG and TIG welders cover most site welding, but they’re not the whole story.

Stick welding, also called MMA (manual metal arc), uses a flux-coated electrode and needs no shielding gas, which makes it reliable in wind, rain, and on rusty or painted steel where MIG and TIG would struggle.

Flux-Cored welding runs a tubular wire with its own internal flux, giving high deposition rates for heavy structural work outdoors, again without relying on a clean gas shield.

Some sites also need to cut, gouge or prepare edges before welding starts. A handful of multi-process welders extend that far, using a carbon electrode and compressed air to cut a clean groove through steel. The question isn’t which single process wins. It’s which combination a crew actually needs on the one machine.

Portable diesel welder generator set up on an outdoor worksite, with a welder in full PPE arc welding a steel joint at sunset

Choosing the Right Multi-Process Welder for Your Site

Every welder in the Onsite Rentals fleet runs MIG and TIG as standard, so switching processes mid-job never means waiting on a second machine. Some models go further, adding Flux-Cored welding or gouging for crews that need the extra capability on hand.

WelderAmperageMIGTIGStickFlux-CoredGouging
Dual Welder 450amp Diesel450A, dual operatorYesYesYesYesYes
Dual Welder 480amp Diesel cc-cv480A, dual operatorYesYesYesYesYes
Welder 500amp Diesel Air Vantage500AYesYesYesYesYes
Welder 580amp Diesel Vantage580AYesYesYesYesYes
Welder 600amp Diesel Air Vantage600AYesYesYesYesYes
Welder 800amp Diesel Air Vantage800A, dual operatorYesYesYesYesYes

The Verdict: MIG Welding vs TIG Welding on Australian Construction Sites

There’s no single winner in TIG welding vs MIG welding. MIG carries the volume, running fast, strong welds across structural steel and general fabrication. TIG carries the precision, holding up on stainless, aluminium and any joint that needs a certification-grade finish. Stick and Flux-Cored fill the gaps TIG or MIG welding can’t, welding through rust, paint and bad weather without a shielding gas to protect.

That’s the case for hiring a multi-process welder rather than a single-process machine. A crew moving between structural framing, pipework and site repairs shouldn’t need three different welders parked on site to get through the program.

Here at Onsite Rentals, our entire welder fleet is capable of both MIG and TIG as a minimum. Some models can also do Stick welding, Flux-Cored welding, and gouging.

Browse our full range of dual welder compressor hire and dual welder generator hire options to find the right multi-process machine for your site.

Contact us

The main difference between TIG and MIG welding is that TIG uses a non-consumable tungsten electrode and a separate filler rod for slower, more precise work, while MIG feeds a continuous wire electrode for fast, high-volume welding.

MIG is faster. Its continuous wire feed lets an operator run long, uninterrupted welds, which is why it’s the default for structural steelwork and high-volume fabrication where speed matters more than a refined finish.

For structural framing, usually not. But for stainless steel, aluminium or any weld that has to pass a visual or NDT inspection, TIG’s precision is worth the slower pace, which is why every Onsite Rentals welder runs TIG as standard alongside MIG.

Get in touch

For immediate assistance call us on 13 40 40, or send us an enquiry below and one of our equipment hire specialists will reach out to you shortly.








    Stay connected with us. Sign up to our newsletter for the latest information.

    Processing...
    Thank you! Your subscription has been confirmed. You'll hear from us soon.
    ErrorHere