MIG welding handles structural steel at production speeds. TIG welding fuses titanium components at tolerances as thin as 0.5mm, thin enough to warp or burn through under excess heat. Both processes use an electric arc and shielding gas, and both show up in the same industries. What separates them is what each one is built to do.
Most combination welding programs cover four core processes:
- Gas Metal Arc Welding (GMAW), commonly called MIG
- Gas Tungsten Arc Welding (GTAW), commonly called TIG
- Shielded Metal Arc Welding (SMAW)
- Flux Core Arc Welding (FCAW)
MIG and TIG generate the most questions because they look similar on the surface and operate differently in practice.
What Is MIG Welding?
In MIG welding, a consumable wire electrode feeds continuously through a welding gun.
An electric arc melts both the wire and the base metal, forming the weld joint. The wire serves as both filler material and electrical conductor. A shielding gas runs alongside the wire to protect the molten weld pool from atmospheric contamination. For mild steel, the standard mixture is argon and carbon dioxide. For aluminum, pure argon is used.
Because the wire feeds automatically, MIG demands less manual coordination than TIG. That lower entry point makes it a common starting process in welding training, and its higher deposition rates make it the standard choice in production environments where throughput matters. MIG works well on thicker base metals, generally 1mm and above, with solid penetration on structural welds. It produces more spatter than TIG, so post-weld cleanup is routine.
Key characteristics of MIG welding (GMAW):
- Consumable wire electrode feeds automatically through the gun, acting as both filler and conductor
- Shielding gas composition varies by material (argon-CO₂ for mild steel, pure argon for aluminum)
- Higher deposition rates than TIG; better suited for high-volume and production work
- Works well on thicker base metals; produces some spatter that requires post-weld cleanup
- Lower skill entry point relative to TIG
What Is TIG Welding?
TIG welding uses a non-consumable tungsten electrode to generate the arc. Unlike MIG, the electrode doesn’t melt into the weld. Filler metal comes from a bare rod the welder adds to the weld pool by hand while the other hand controls the torch. Amperage is typically managed with a foot pedal. All three inputs (torch movement, filler rod, and amperage) happen simultaneously, which is why GTAW carries a steeper learning curve than GMAW.
That coordination produces precision. TIG generates minimal spatter, leaves tight bead profiles, and gives the welder independent control over heat input and filler addition. That level of control is what makes it the process of choice for thin materials and alloys like aluminum, titanium, and stainless steel, where excess heat causes distortion or burn-through.
Key characteristics of TIG welding (GTAW):
- Non-consumable tungsten electrode; filler rod added by hand while the other hand controls the torch
- Inert shielding gas (typically pure argon) protects the arc and weld pool
- Independent control over heat input and filler addition produces clean, precise welds
- Well suited for thin materials (0.5–4mm) and exotic alloys including titanium, aluminum, and stainless steel
- Higher skill floor than MIG; widely specified in aerospace, medical fabrication, and precision manufacturing
How MIG and TIG Welding Compare
The core tension in MIG vs TIG welding is speed versus precision. Neither process is universally superior. The material and the application determine which one belongs on the job.
| MIG (GMAW) | TIG (GTAW) | |
| Speed | Faster | Slower |
| Skill Level | Lower entry point | Higher skill floor |
| Materials | Thicker metals (1mm+) | Thin and exotic alloys (0.5–4mm) |
| Weld Finish | More spatter; post-weld cleanup typical | Clean, minimal spatter |
| Shielding Gas | Argon-CO₂ (mild steel); pure argon (aluminum) | Pure argon |
| Heat Control | Limited | Independent control of heat and filler |
| Suited For | Production volume, structural work | Precision fabrication, aerospace, repair |
MIG vs. TIG: Where Each Process Shows Up in the Field
Both MIG and TIG welding appear across the same industries, frequently in the same shop, for different parts of the same project.
- Aviation: TIG handles thin-gauge aluminum, titanium, and structural repairs where precision and compliance are required. MIG covers faster fabrication on thicker components. All aircraft weld repairs must meet FAA-accepted inspection and repair standards regardless of which process is used.
- Automotive and motorsport: TIG is standard for roll cages, exhaust systems, and precision frame work. MIG covers body panels and assembly-line production.
- Shipbuilding and infrastructure: MIG handles long structural seams at volume. TIG takes over for pipe joints and pressure vessel components where tight quality tolerances apply.
- Aerospace and defense manufacturing: TIG dominates on exotic alloys and precision parts. Robotic MIG runs high-volume production lines.
- Energy: TIG handles critical pipeline welds. MIG covers structural support and general fabrication.
Which Welding Process Does the Job Call For?
Process selection in welding follows the work, not the welder’s preference. Material type and thickness come first. Thin-gauge and exotic alloys require GTAW because independent heat control and precise filler management prevent distortion and burn-through. Thicker structural metals suit GMAW because speed and penetration matter more than bead aesthetics.
Finish standard and production volume narrow the decision further. Aerospace and medical fabrication call for TIG-quality welds because the tolerances don’t allow for spatter or dimensional drift. Structural construction moves faster with MIG. High-volume production runs favor MIG’s deposition rate, while one-off repairs and precision components favor TIG’s control.
A welder who can work both processes has more options on any job site. Many shops run MIG on the fabrication floor and TIG in a repair or finishing bay. Working only one process narrows where you can be placed.
How Combination Welding Training Covers Both
Combination welding programs cover the four core processes employers commonly look for in entry-level candidates:
- Hands-on training with SMAW, GMAW (MIG), FCAW, and GTAW (TIG)
- Welding theory and process fundamentals
- Shop print reading and blueprint interpretation
Training across all four processes opens eligibility for a broader range of American Welding Society® (AWS®) Certified Welder testing. The AWS® Certified Welder (CW) credential is performance-based, process-specific, and transferable. It follows the welder, not the employer.
Aviation Institute of Maintenance’s (AIM’s) Combination Welding Diploma Program can be completed in as little as eight months. Graduates meet the eligibility requirements to pursue AWS 3G-4G testing, which upon passing covers all welding positions on structural plate. Career Services support connects graduates with employers in fabrication, manufacturing, aerospace, and related fields.
If you’re ready to train across all four core welding processes, request information to get started or explore the program to review the full curriculum and next start dates.
Frequently Asked Questions About MIG vs TIG Welding
What is the difference between MIG and TIG welding?
MIG welding uses a consumable wire electrode that feeds automatically through the gun, making it faster to start and less demanding in coordination than TIG. TIG welding uses a non-consumable tungsten electrode with a separately added filler rod, giving the welder independent control over heat and weld quality.
MIG suits thicker materials and high-volume work. TIG suits thin materials and precision applications where weld appearance and dimensional accuracy matter.
Which welding process is harder to learn, MIG or TIG?
TIG is harder to learn. The welder controls the torch, filler rod, and amperage simultaneously. That level of coordination requires more practice than MIG’s wire-feed process. Most students find MIG more approachable as a starting point.
What metals can you weld with MIG vs TIG?
MIG handles a wide range of metals, including mild steel, stainless steel, and aluminum, particularly on thicker base material. TIG handles the same metals but excels on thin sections and exotic alloys like aluminum, titanium, magnesium, and stainless steel, where precise heat control prevents distortion.
Do welding programs teach both MIG and TIG?
Most combination welding programs cover both alongside SMAW and FCAW. The curriculum introduces graduates to the range of processes used across multiple industries.
What is the difference between GMAW and GTAW?
GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) are the formal names for MIG and TIG welding. GMAW feeds a consumable wire electrode continuously through the gun; GTAW uses a non-consumable tungsten electrode with filler added by hand.
In practice, that means GMAW runs faster with a lower skill floor, while GTAW runs slower and gives the welder independent control over heat and weld quality.
Both designations come from American Welding Society® (AWS®) process standards and appear alongside the informal MIG and TIG names in job postings, certifications, and technical specifications.
Which welding process does aerospace use?
Aerospace fabrication and repair rely heavily on TIG welding because it produces the precise, clean welds that exotic alloys and safety-critical components require. MIG welding is used in high-volume aerospace manufacturing, often with robotic systems on production lines.
How long does it take to learn TIG welding?
TIG takes longer to develop than MIG because of the coordination it demands. In a structured combination welding program, students are introduced to foundational TIG techniques alongside the other core processes. Professional proficiency develops with continued practice after completing training.
What certifications can welding students earn?
Graduates of a combination welding program can test for the AWS® Certified Welder (CW) credential, a performance-based credential recognized across industries. Specific test positions depend on the program curriculum. AIM graduates meet the eligibility requirements to pursue AWS 3G-4G testing upon completing the program; upon passing, this certification covers all welding positions on structural plate.
What is a combination welding program?
A combination welding program teaches multiple core processes (typically SMAW, GMAW, FCAW, and GTAW) in one curriculum. Graduates pursue entry-level roles working with the full range of processes that employers in fabrication, construction, manufacturing, and aerospace rely on.
