MIG vs TIG vs Stick Welding: Which Process Should You Use?

If you're setting up a workshop, switching processes, or just trying to make sense of the options, the choice between MIG, TIG and stick welding comes down to one question: what are you actually welding, and where?

Each process has a distinct set of strengths. MIG (GMAW) is fast, versatile and the easiest to become productive with. TIG (GTAW) is slow, precise and the right call for thin or exotic metals where weld quality is non-negotiable. Stick (SMAW), known as MMA on Australian job sites, is the most portable process — no gas bottle, no wire feed, and it works outdoors on dirty or rusty metal without fuss.

This guide covers all three in full: how each process works, what it's suited to, where it falls short, and how to choose the right one for your application.

What Is Arc Welding? MIG, TIG and Stick Explained

Arc welding uses an electric arc sustained between an electrode and the workpiece to generate the heat needed to melt and fuse metal. All three mainstream manual arc processes work on this principle. What distinguishes them is how the arc is maintained, how the weld pool is shielded, and how filler metal is introduced.

In Australia, these processes are known by both trade names and formal designations:

MIG and TIG both use shielding gas (argon-based) to protect the weld pool. Stick welding uses a flux coating on the electrode — the flux burns to produce a protective gas shield and slag layer, which is why stick needs no external gas supply. MIG feeds filler metal automatically from a wire spool; TIG requires the operator to add a filler rod manually; stick uses a consumable electrode that is both arc conductor and filler source.

MIG Welding (GMAW): Speed, Ease and Versatility

MIG welding feeds a continuous spool of solid wire through a welding torch. The arc forms between the wire tip and the workpiece; shielding gas flows from a nozzle around the wire to protect the molten pool. The operator sets wire speed and voltage, positions the torch, and controls travel speed and angle. The machine handles the rest — which is why MIG is the most common welding process in fabrication shops and the one most beginners learn first.

Modern synergic MIG machines adjust wire feed speed and voltage automatically based on wire diameter and material type, making setup straightforward even for less experienced operators. Shielding gas is typically C25 (75% argon / 25% CO₂) for mild steel, pure argon for aluminium, or tri-mix for stainless steel.

What MIG Welding Is Best For

• Mild steel fabrication — frames, brackets, trailers, agricultural and light structural work
• Sheet metal and automotive body work (0.6mm–3mm range)
• Production and repetitive welding — continuous wire reduces stops, high deposition rate
• Stainless steel with appropriate shielding gas (98% argon / 2% CO₂ or tri-mix)
• Aluminium with pure argon and aluminium wire (ER4043 or ER5356)
• Indoor workshop environments where shielding gas can be maintained reliably

Gasless MIG Welding (FCAW): When to Use It

Flux-Cored Arc Welding (FCAW) — commonly called "gasless MIG" in Australia — uses a hollow wire with flux inside instead of solid wire with external shielding gas. The flux generates its own shielding as it burns, making the process tolerant of wind and lightly dirty metal. Many MIG machines can switch between solid wire (gas-shielded) and flux-core wire by reversing polarity and removing the gas connection.

TIG Welding (GTAW): Precision for Critical Welds

TIG welding uses a non-consumable tungsten electrode to sustain the arc. The operator holds the torch in one hand and feeds filler rod with the other, dipping it into the weld pool manually. A foot pedal or thumb wheel modulates amperage on the fly. Shielding gas — almost always pure argon — flows from the torch cup to protect the tungsten and weld pool.

TIG is the slowest process and demands the most hand-eye coordination. It is also the most versatile in terms of material compatibility, and produces the cleanest, most precise welds — no spatter, minimal distortion on thin sections. It is the only practical process for welding titanium, magnesium and thin-wall stainless tube where weld appearance and integrity are both critical. Alternating current (AC) TIG is used for aluminium and magnesium; DCEN for steel, stainless and exotic alloys.

What TIG Welding Is Best For

• Stainless steel — pipe, tube, food-grade fabrication, process equipment and pressure vessels
• Aluminium — structural, marine, automotive and pressure applications (AC TIG)
• Titanium, copper alloys, magnesium, nickel alloys and other exotic metals
• Thin-wall sections where MIG would burn through (0.5mm–4mm range)
• Visible or cosmetic welds where bead appearance is a requirement
• Root passes on pipe joints subject to X-ray or ultrasonic inspection

Stick Welding (SMAW/MMA): Portable and Outdoor-Ready

Stick welding — MMA (Manual Metal Arc) in Australian trade usage — uses a consumable coated electrode. When the arc forms, the flux coating burns to produce shielding gas and forms a slag layer over the weld pool. No external gas cylinder is required. This is the defining advantage: portability. A DC power source and a box of electrodes is all you need. No wire feed to jam, no gas nozzle to block, no cylinder to refill.

An MMA machine can be carried to a remote location, run off a generator, and used on rusty, painted or mill-scaled steel in wind and rain where MIG would fail. The operator strikes the arc by touching the electrode to the workpiece and holds it at the correct distance — typically equal to the electrode diameter — while simultaneously controlling travel speed and feeding the electrode forward as it burns. This dual manual control is what makes stick moderately harder to learn than MIG.

What Stick/MMA Welding Is Best For

• Outdoor and field welding — fully tolerant of wind and adverse weather
• Maintenance and repair of heavy structural steel, plant equipment and agricultural machinery
• Welding on dirty, rusty, painted or mill-scaled surfaces without full preparation
• Thick-section steel (6mm+) where deep penetration and high deposition are required
• Remote locations — generator-compatible, no gas cylinder logistics
• Cast iron repair with Ni-Fe electrodes; hardfacing and build-up work

MIG vs TIG vs Stick — Head-to-Head Comparison

How to Choose the Right Welding Process for Your Job

Process selection in an industrial or maintenance context is driven by six factors: base material, material thickness, joint quality requirement, environment, available equipment, and operator skill. Work through these in order and the right process usually becomes clear.

By Material Type

By Material Thickness

By Environment

Workshop fabrication: MIG is the default. Fastest, cleanest and most productive for indoor steel fabrication. TIG for stainless and aluminium where quality demands it.

Site and field maintenance: Stick/MMA is the right call. No gas cylinder, no wire feed mechanism to jam, wind-tolerant, works on scaled and painted steel. Gasless MIG is a reasonable alternative when faster travel speed is needed and there's shelter from wind.

Precision engineering and food-grade fabrication: TIG. Weld quality and appearance requirements in food-grade stainless and precision engineering cannot be met reliably with MIG or stick.

Which Process Should You Learn First?

This is genuinely debated in Australian welding communities, and both common answers have merit depending on your goal.

Learn MIG first if your goal is fabrication employment. MIG is the most common process in light to medium industry, and you'll become productive fastest. Most workshop jobs are MIG-based.

TIG is not a first process. The coordination required — torch hand, filler hand, foot pedal amperage control — and TIG's sensitivity to technique errors means beginners rarely produce usable welds without months of dedicated practice. Learn MIG or stick first, then add TIG when you have a specific application that demands it.

Equipment and Setup Costs in Australia

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Welding Consumables for Each Process

Choosing the correct consumable for the material and application is as important as choosing the process. A mismatch — wrong electrode grade, wrong wire type, wrong tungsten — will compromise weld quality regardless of operator technique.

MIG wire: ER70S-6 is the standard general-purpose wire for mild steel (0.6mm–1.2mm diameter). ER4043 or ER5356 for aluminium. ER308L, ER309L or ER316L for stainless steel. Flux-core wire (E71T-11 gasless; E71T-1 gas-shielded) for FCAW applications.

TIG tungstens and filler rods: Tungsten is colour-coded — pure (green/grey) for AC aluminium; 2% thoriated red or rare-earth purple (E3) for DCEN on steel and stainless. Filler rods match base metal: ER70S-2 for mild steel, ER308L for 304 stainless, ER4043/ER5356 for aluminium.

Stick electrodes: E6013 for general mild steel (easy striking, moderate penetration). E6011 for dirty or scaled metal and AC machines. E7018 low-hydrogen for structural AS/NZS 1554 work — requires dry storage in a rod oven. E308L-16 or E316L-16 for stainless. ENiFe-Cl for cast iron repair.

Australian Standards for Welding

For structural and pressure-related welding in Australia, process selection may be governed by the Welding Procedure Specification (WPS) applicable to the job.

AS/NZS 2980:2007 — Quality of fusion welding of steel — is the primary standard for welding quality systems in Australia and New Zealand. It defines qualification requirements for welding procedures and welding personnel.

AS/NZS 1554 series — Structural steel welding — specifies requirements for welding structural steelwork in Australia. AS/NZS 1554.1 covers steel structures; AS/NZS 1554.6 covers stainless steel welding. These standards define acceptable processes, filler metal classifications, preheat requirements and inspection criteria. A structural weld on an Australian job site must comply with the relevant part of AS/NZS 1554.

Welding Safety

All three arc welding processes produce UV and IR radiation, metal fume, spatter and — with stick welding — sparks. Australian standard AS/NZS 1337.1 covers eye protection for industrial applications. Shade selection is governed by AS/NZS 1338.1: generally shade 9–10 for TIG and light MIG; shade 10–12 for MIG at higher amperages; shade 10–13 for stick depending on current.

Ventilation is critical. MIG welding on galvanised or zinc-coated steel produces zinc fume — a serious inhalation hazard. TIG on stainless produces hexavalent chromium fume. All welding requires adequate extraction ventilation; respiratory protection (minimum P2 particulate filter) is required when ventilation cannot be assured.

Summary: MIG vs TIG vs Stick

• MIG (GMAW): Workshop default for mild steel, stainless and aluminium fabrication. Fast, clean, easiest to learn. Needs gas and a clean surface. Won't work outdoors in wind.
• TIG (GTAW): When quality is non-negotiable — thin metal, exotic alloys, precision work, food-grade stainless. Hardest to learn and slowest to execute. Worth it when the job demands it.
• Stick / MMA (SMAW): Outdoor, field and heavy maintenance work. No gas cylinder, works on dirty metal, most portable. Takes more skill than MIG but is the right process when the site won't accommodate gas-shielded welding.

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Frequently Asked Questions

What is the difference between MIG and TIG welding?

MIG welding (GMAW) feeds a continuous spool of solid wire through the torch — the wire is both electrode and filler metal. TIG welding (GTAW) uses a non-consumable tungsten electrode to sustain the arc while the operator adds filler rod separately with the other hand. MIG is faster and easier to learn; TIG is slower, produces cleaner welds and handles a wider range of metals including aluminium, stainless and exotic alloys.

What is MMA welding? Is it the same as stick welding?

Yes. MMA stands for Manual Metal Arc welding and is the standard Australian trade name for stick welding (SMAW — Shielded Metal Arc Welding). The process uses a consumable coated electrode — the flux coating produces shielding gas and slag as it burns, eliminating any need for an external gas supply. MMA appears on Australian welder specifications, WPS documents and trade training materials; American or international sources may use "stick" or "SMAW" for the same process.

When should I use stick welding instead of MIG?

Use stick (MMA) when working outdoors where wind would disrupt MIG shielding gas, when the metal surface is rusty, painted or contaminated and full surface preparation isn't practical, when working in a remote location without gas cylinder access, or when welding thick structural steel where deep penetration matters more than weld appearance. Stick is also the right choice for cast iron repair with Ni-Fe electrodes.

Which welding process is easiest for beginners to learn?

MIG welding is the easiest process to become productive with quickly — a beginner can produce sound welds within days to weeks of practice. Stick welding is moderately more difficult because the operator must manually control arc length throughout the weld, in addition to travel speed. TIG welding is the most difficult — it requires both hands working independently plus foot pedal amperage control, and typically takes 6–12 months of dedicated practice to reach consistent, quality output.

Which welding process produces the strongest weld?

Weld strength is primarily determined by filler metal selection and correct technique, not the process itself. A correctly executed MIG, TIG or stick weld using matching filler metal on mild steel will produce tensile strength meeting or exceeding the base metal. TIG produces fewer defects on critical applications due to greater operator control, but this advantage disappears if the TIG operator is less skilled than the MIG or stick welder being compared.

Can I weld aluminium with a MIG welder?

Yes, but with specific requirements. Aluminium MIG needs pure argon shielding gas (not C25 mix), a Teflon or graphite-lined conduit to prevent wire birdnesting, and either a spool gun or push-pull gun for reliable wire feed. Attempting aluminium MIG with a standard steel-configured machine typically results in wire feed failures. AC TIG remains the preferred process for aluminium — particularly on thin sections where precise heat control is critical.

Do I need shielding gas for MIG welding?

For standard solid-wire MIG (GMAW), yes — shielding gas protects the molten weld pool from atmospheric oxygen and nitrogen. The most common shielding gas for MIG on mild steel in Australia is C25 (75% argon / 25% CO₂). Pure argon is used for aluminium MIG; a tri-mix or 98/2 argon-CO₂ blend for stainless steel. The exception is flux-core wire (FCAW), which generates its own shielding — no external gas is needed.

What is gasless MIG welding, and when should I use it?

Gasless MIG welding uses flux-cored wire (FCAW) instead of solid wire and external shielding gas. The flux inside the hollow wire burns to create its own gas shield, making the process wind-tolerant and suitable for outdoor use. Use gasless MIG when welding outdoors where standard gas-shielded MIG isn't practical, on lightly contaminated or scaled steel, or when gas cylinder logistics are impractical. Gasless MIG produces more spatter and slag than gas-shielded MIG and is not suitable for thin sheet metal below 1.5mm.

Which welding process works outdoors without shielding gas?

Stick welding (MMA/SMAW) is the most outdoor-capable process — it needs no shielding gas because the electrode's flux coating provides protection. Gasless MIG (FCAW) also works outdoors and tolerates moderate wind. Standard gas-shielded MIG (GMAW) and TIG (GTAW) are both unsuitable for outdoor use in any wind — the gas shield is disrupted, leaving the weld pool unprotected and producing porous, defective welds.

What is the rule of 33 in TIG welding?

The rule of 33 (also called the "one amp per thousandth" guideline) is a starting-point formula for setting TIG amperage: approximately 1 amp per 0.025mm of material thickness, or roughly 40 amps per millimetre of steel. For example, 3mm mild steel starts at around 90–120 amps. This is a baseline only — actual amperage varies with joint design, filler rod diameter, travel speed and operator technique. Use it to set a starting point, then adjust from the first test pass.

What metal thicknesses are MIG, TIG and stick welding suited to?

MIG is typically used from 0.6mm up to 12mm+ in multiple passes on mild steel. TIG handles the thinnest material reliably — from 0.5mm upward — and is the preferred process for thin-wall tube and sheet work. Stick welding is most practical from 3mm upward; below this, heat input is difficult to control without burning through. For structural plate 12mm and above, stick welding provides excellent penetration and is well suited to multi-pass field welding.

Which welding process is best for stainless steel?

For precision and food-grade stainless applications, TIG (GTAW) is the preferred process — it produces clean, low-heat-input welds with minimal distortion and a profile that meets hygiene and aesthetic requirements. For structural stainless where appearance is secondary, MIG with 98% argon / 2% CO₂ and matching stainless wire (ER308L, ER316L) is faster and acceptable. Stick on stainless is possible using stainless electrodes (E308L-16, E316L-16) and is generally limited to maintenance repairs where TIG or MIG is unavailable.