MIG vs TIG Welding: Key Differences, When to Use Each, and What to Specify

MIG welding costs less per hour and completes jobs faster. TIG welding produces stronger, cleaner welds with more precise heat control. Neither is “better” in any universal sense. In fact, the right choice depends on what your part actually demands.

For engineering and procurement teams specifying custom fabricated assemblies, getting this wrong has direct consequences. Specifying TIG where MIG is sufficient drives up unit costs and limits which factories can quote. On the contrary, specifying MIG where TIG is required risks weld quality that won’t pass inspection.

This guide breaks down the mig vs tig welding decision systematically: process mechanics, weld strength, material suitability, costs, industry applications, and a decision table you can use when writing a sourcing inquiry.

TL;DR / Key Takeaways

• MIG welding (GMAW) uses a continuously fed consumable wire electrode. It's faster, cheaper, easier to learn, and best for thicker materials and high-volume production.
• TIG welding (GTAW) uses a non-consumable tungsten electrode with a separately hand-fed filler rod. Slower, more expensive, and technically demanding, but superior for precision, aesthetics, and thin or reactive metals.
• TIG welds are generally stronger due to a narrower arc and fewer impurities in the weld pool.
• MIG deposition rates run at 4-8 kg/hr; TIG at 1-2 kg/hr - the primary reason TIG costs significantly more per metre of weld bead.
• For sourcing custom welded parts from Chinese factories. The process you specify directly affects which facilities are qualified to quote.

What Is the Difference Between MIG and TIG Welding?

MIG and TIG welding are both arc welding processes that use an electric arc and shielding gas to join metals. But they differ fundamentally in electrode type, filler delivery, and heat control.

MIG welding (Metal Inert Gas, formally GMAW - Gas Metal Arc Welding) feeds a continuous consumable wire electrode through the welding gun. That wire acts as both the electrode and the filler metal, melting automatically into the weld pool as the welder moves the gun along the joint.

TIG welding (Tungsten Inert Gas, formally GTAW - Gas Tungsten Arc Welding) uses a non-consumable tungsten electrode to generate the arc. The welder holds the TIG torch in one hand and feeds a separate filler rod manually into the weld pool with the other. Amperage is controlled in real time via a foot pedal or thumb wheel.

The practical result: MIG is faster, more forgiving, and runs with one hand. TIG is slower, more precise, and requires coordinating 3 simultaneous inputs.

How Does MIG Welding Work?

MIG welding creates an arc between a continuously fed consumable wire electrode and the base metal. The wire feeds through the gun at a preset speed and melts directly into the joint, forming the weld pool automatically.

A shielding gas - typically a 75% argon and 25% CO2 mixture - flows from the torch nozzle around the arc at 35-50 cubic feet per hour. The CO2 improves arc stability and weld penetration, which is why MIG performs particularly well on thicker mild steel and carbon steel sections.

Heat input is controlled by adjusting wire feed speed and voltage at the machine. The process requires only one hand to operate, making it more manageable in awkward positions and better suited to sustained production runs.

How Does TIG Welding Work?

TIG welding generates an arc from a non-consumable tungsten electrode. Because the electrode doesn’t melt, the welder maintains a narrow, stable arc with precise control over heat delivery.

The shielding gas is typically 100% argon, flowing at 15-25 cubic feet per hour. Pure argon is required because tungsten is sensitive to reactive gases like oxygen and CO2 - contamination degrades the electrode and compromises the weld.

The welder manages 3 simultaneous actions: guiding the torch, feeding the filler rod into the weld pool, and controlling amperage with a foot pedal. That coordination requirement is what makes TIG significantly harder to master and slower to execute.

MIG vs TIG Welding: Full Comparison

MIG and TIG welding differ across 14 measurable parameters. From deposition rate to weld aesthetics. The table below covers each.

Factor	MIG Welding	TIG Welding
Formal name	GMAW (Gas Metal Arc Welding)	GTAW (Gas Tungsten Arc Welding)
Electrode	Consumable wire (auto-fed)	Non-consumable tungsten
Filler delivery	Automatic via wire feed	Manual via separate filler rod
Shielding gas	75% argon + 25% CO2 (typical)	100% argon (typical)
Gas flow rate	35-50 cubic feet per hour	15-25 cubic feet per hour
Deposition rate	4-8 kg/hr	1-2 kg/hr
Weld strength	Good (improves with V-groove joint prep)	Higher - narrower arc, fewer impurities
Weld precision	Moderate	High
Weld aesthetics	Acceptable; spatter common	Excellent; minimal to no spatter
Skill level	Beginner-accessible	Advanced - requires years to master
Best material thickness	Thicker stock (above 3 mm)	Thin sections and precision work
Cost per metre of weld	Lower	Higher
Speed	Fast	Slow
Best applications	Carbon steel, structural fab, production	Stainless, aluminium, titanium, aesthetics

Sidenote. Deposition rates and gas flow figures are general industry benchmarks. Actual values vary by wire diameter, amperage settings, joint geometry, and operator technique.

Which Is Stronger: MIG or TIG Welding?

TIG welding generally produces stronger weld joints than MIG. The narrower, more focused arc creates better penetration into the base metal and allows greater control over the weld pool - resulting in fewer voids, inclusions, and impurities in the finished bead.

That doesn’t mean MIG welds are weak. On structural mild steel, a skilled MIG welder using proper joint preparation - grinding a V-shaped groove into the joint before welding - can achieve comparable penetration and tensile strength. The process gap narrows significantly when technique and geometry are right.

Where TIG’s strength advantage holds firm: thin materials, exotic metals like titanium and Inconel, and applications subject to radiographic or ultrasonic inspection. For those parts, TIG is the standard precisely because the quality difference is measurable and matters.

Which Welding Process Works Best for Different Materials?

The material is often the single most decisive factor in the MIG vs TIG welding choice. More than production speed or budget.

Material	Preferred Process	Reason
Mild steel / carbon steel	MIG	High deposition rate, strong welds, cost-effective for thick sections
Stainless steel 304 / 316 (thin)	TIG	Precise heat control avoids distortion and preserves corrosion resistance
Stainless steel 304 / 316 (production)	MIG	Acceptable quality for non-critical runs where speed matters
Aluminium 6061 / 5052 (under 4 mm)	TIG with AC current	AC cycle cleans the aluminium oxide layer; better control on thin sheet
Aluminium (above 6 mm, production)	Pulse MIG	Higher deposition rate; acceptable quality for structural applications
Titanium (Grade 2, Grade 5)	TIG only	Reactive metal requires full inert gas shielding; MIG cannot protect adequately
Cast iron	MIG with nickel wire	TIG is rarely used on cast iron; MIG with ER70S-2 or nickel wire is standard
Copper and copper alloys	TIG	Copper’s high thermal conductivity demands precise heat input
Magnesium	TIG with AC current	Reactive surface layer requires the same AC cleaning action as aluminium

On stainless steel: Stainless steel has roughly one-third the thermal conductivity of mild steel, so heat concentrates and distortion risk is significantly higher. TIG welding’s real-time amperage control prevents warping - which is why precision stainless fabrication almost always specifies TIG.

On aluminium: Both processes can weld aluminium, but the choice depends on thickness and quality requirement. TIG with AC is the standard for thin-wall, precision, or aesthetically visible aluminium. Pulse MIG is used in volume production for thicker aluminium extrusions and structural parts. AWS D1.2 covers aluminium welding standards applicable to structural applications.

How Much Does MIG vs TIG Welding Cost?

TIG welding costs more per metre of weld bead than MIG - and the difference is substantial, not marginal.

The primary driver is deposition rate. MIG operates at 4-8 kg/hr because the wire feeds continuously without welder intervention. TIG operates at 1-2 kg/hr because filler is manually controlled and the pace is limited by welder skill and heat management. That means TIG takes 3-4x longer to complete the same joint length.

Labour amplifies this gap. Skilled TIG welders command higher hourly rates than MIG operators because the qualification threshold is higher. On a typical fabrication job, the combination of lower speed and higher labour cost makes TIG significantly more expensive per metre.

Equipment costs add to the difference. A production MIG setup runs $500-$3,000; a comparable TIG system runs $1,000-$5,000+, with water-cooled TIG torches required for sustained high-duty-cycle work.

When does TIG’s premium justify itself? When the part requires it. Aerospace-grade aluminium assemblies, medical-grade stainless fabrications, visible structural welds, and reactive metal components justify TIG. High-volume mild steel fabrication typically does not.

Sidenote. When sourcing from Chinese welding factories, always request a cost breakdown that separates welding from other operations. Factories sometimes absorb TIG premium into a blended price that obscures whether your specification is being met. A weld procedure qualification record (WPQR) confirms the process was followed.

Which Industries Use MIG vs TIG Welding?

Process choice in each industry is driven by material specification, inspection requirements, and certification standards.

Automotive and EV Manufacturing

MIG dominates body panel and structural steel fabrication where speed and volume matter. TIG is used for precision powertrain components, aluminium battery enclosures, and any assembly where post-weld appearance is critical. IATF 16949-certified automotive parts suppliers operate both processes.

Aerospace

TIG is the standard for structural aluminium (7075-T6), titanium (Grade 5), and nickel alloys (Inconel 718). AS9100-certified welding facilities hold weld procedure qualifications to AWS D17.1 or equivalent for aerospace work. MIG is rarely used on primary aerospace component structures.

Industrial Machinery and Equipment

MIG handles structural steel frames, housings, and brackets at volume. TIG is used for hydraulic circuit components, thin-wall stainless piping, and parts requiring clean, defect-free welds prior to post-weld machining. Haizol’s network of custom industrial parts suppliers covers both processes.

Medical Devices

TIG is the mandatory process for stainless steel 316L and titanium components used in surgical instruments, diagnostic housings, and implant assemblies. ISO 13485-certified medical device manufacturing facilities all hold GTAW procedure qualifications.

Marine and Energy

MIG for structural steel fabrication. TIG for stainless piping, pressure vessel seams, and any weld subject to X-ray, ultrasonic, or pressure testing.

General fabrication and custom metalwork: MIG handles the majority of structural and commercial fabrication. TIG covers automotive restoration, artistic metalwork, and any commission where weld bead appearance is part of the finished product. The metal fabrication process incorporates both welding methods across cutting, forming, and joining stages.

For a complete view of verified custom welding services - MIG, TIG, spot welding, and weldment fabrication - Haizol’s factory network covers the full process range.

When Should You Use MIG vs TIG Welding?

The 11-scenario table below maps common project conditions to the right process.

Scenario	Use This	Reason
Mild steel above 3 mm, non-critical	MIG	Better penetration, faster, cost-effective
Thin stainless (304 or 316), precision	TIG	Avoids distortion; preserves corrosion resistance
Aluminium below 4 mm	TIG with AC	Oxide cleaning action; control on thin sheet
Aluminium above 6 mm, production volume	Pulse MIG	Higher deposition; acceptable structural quality
Titanium or reactive metals	TIG only	Full inert shielding required
High-volume production, aesthetics secondary	MIG	Speed and cost efficiency
Visible welds, no post-weld coat or paint	TIG	Clean bead, no spatter, no finishing required
Outdoor or site welding	MIG or FCAW	Shielding gas disruption is less of a concern with FCAW
Pressure vessel or pipe seams	TIG	Consistent penetration, minimal defects
Weld quality subject to inspection (UT, RT)	TIG	Narrower arc, fewer inclusions
Less experienced welding team	MIG	More consistent results at lower skill levels

The deciding logic: if cost and speed are the priority and material and quality permit it, MIG. If material reactivity, weld integrity, inspection requirements, or aesthetics are the priority, TIG.

Is MIG or TIG Welding Easier to Learn?

MIG welding is significantly easier to learn. The welder manages one hand, controlling torch angle and travel speed while the machine handles wire feed and shielding gas flow. Most welders can produce structurally acceptable MIG beads on mild steel within a few weeks of practice.

TIG welding requires simultaneous coordination of 3 independent inputs: the TIG torch (dominant hand), the filler rod (other hand), and the amperage foot pedal. Any inconsistency in arc length, filler feed rate, or heat input shows immediately in the weld bead. Joint surfaces must also be cleaned and prepared more thoroughly for TIG than for MIG.

Professional TIG welders typically invest several years of structured practice before achieving consistent, high-quality welds across all materials and positions. That skill gap is reflected directly in the difference in hourly labour rates between the two processes.

How to Source MIG and TIG Welded Parts

When specifying custom welded assemblies from a Chinese factory, the welding process belongs in the RFQ - not just the drawing.

Factories that receive an underspecified drawing default to the process they’re most comfortable with or most cost-efficient for them. If your part requires TIG and the factory quotes with MIG, you won’t know until the weld inspection fails.

Include these in your welding sourcing inquiry:

• Welding process (MIG/GMAW or TIG/GTAW)
• Filler material specification (ER308L for 304 stainless, ER4043 or ER5356 for aluminium 6061, ER70S-6 for mild steel)
• Shielding gas type and purity
• Required certifications (ISO 15614-1 for weld procedure qualification, AWS D1.1 for structural steel)
• Post-weld operations (grinding, passivation and surface treatment, pressure testing, inspection method)

Chinese factories with precision TIG capability - for aerospace, medical, or automotive-grade stainless - typically operate under ISO 9001, ISO 13485, or AS9100 quality systems and hold written weld procedure qualification records (WPQR). Verifying this before the RFQ stage prevents capability mismatches.

Haizol’s verified factory network includes welding specialists across both MIG and TIG processes. Submit a welding RFQ via our custom welding services page and receive quotes within 24 hours from capability-matched factories, each with documented welding certifications and equipment profiles so you can confirm qualification before you award.

Frequently Asked Questions

Which Is Better, MIG or TIG Welding?

Neither is universally better. MIG welding is better for speed, cost, and thicker materials. TIG welding is better for precision, strength, aesthetics, and thin or reactive metals. The right choice depends on material, thickness, quality requirements, and production volume.

Which Is Stronger, MIG or TIG Welding?

TIG welding generally produces stronger weld joints. The narrower, focused arc delivers better penetration with fewer impurities in the weld pool. MIG welds on properly prepared joints can approach TIG strength on structural steel - but for thin materials, reactive metals, or inspection-critical parts, TIG is consistently stronger.

Is MIG or TIG Welding Easier to Learn?

MIG welding is significantly easier to learn. It requires one hand and relatively simple machine controls. TIG welding requires simultaneous management of a torch, a filler rod, and a foot pedal - a coordination challenge that takes years of structured practice to master consistently.

Which Process Is Better for Aluminium?

TIG welding with alternating current (AC) is the standard for thin aluminium (under 4 mm) because AC breaks down the aluminium oxide layer on the surface. Pulse MIG is used for thicker aluminium in production environments. For precision aerospace or EV components in aluminium 6061 or 7075, TIG is standard.

Which Welding Process Is Better for Stainless Steel?

TIG is the standard for thin stainless steel (under 3 mm) and any precision stainless fabrication where distortion and corrosion resistance are critical. MIG is acceptable for thicker stainless sections in production runs where appearance is secondary.

Do MIG Welders Need Shielding Gas?

Standard MIG welding requires shielding gas - typically 75% argon and 25% CO2. Flux-cored arc welding (FCAW) is a related process that uses flux-filled wire to generate its own shielding gas, which makes it better suited for outdoor welding or sites where gas cylinders are impractical.

Is TIG Welding the Same as Arc Welding?

TIG welding is a specific type of arc welding. Arc welding is the broader category covering all processes that use an electric arc to generate heat, including MIG (GMAW), TIG (GTAW), stick welding (SMAW), and flux-cored welding (FCAW). 

What Should I Specify When Ordering Custom Welded Parts?

Include in your RFQ: welding process (MIG or TIG), filler material grade, shielding gas specification, required certifications (ISO 15614-1, AWS D1.1, or sector-specific standards), and post-weld requirements. For TIG work, request weld procedure qualification records (WPQR) from the factory before awarding. Submit your spec through Haizol’s custom welding services page to reach capability-matched factories within 24 hours.

Conclusion

If you’re sourcing custom welded parts or assemblies, the process you specify matters as much as the material. Submit an RFQ on Haizol and receive quotes within 24 hours from verified welding factories - each with capability documentation confirming TIG or MIG certification before you commit. Submit a welding RFQ