It’s not unusual for customers new to welding jobs to approach S&W with some misconceptions about MIG vs. TIG welding. A lot of folks think MIG is just an easier yet inferior process, or that TIG is only used for welding aluminum. While there’s a bit of truth behind both those ideas, neither of them are facts.
Let’s put some of the most common misconceptions to bed up front:
- You can in fact MIG weld aluminum. It just requires a specific setup, wire material, shielding gas, etc.
- MIG is the easier process to master, but it’s not necessarily inferior. Because that means it’s usually quicker and less costly, and thus more suitable for many projects that don’t have special requirements for TIG.
- Generally, TIG welds penetrate deeper, offer higher strength, higher-precision control, as well as better compatibility with aluminum and stainless materials.
- Nevertheless, a quality MIG weld will exceed the strength of the base metal, so proper MIG joints definitely aren’t weak.
If you’re new to specifying or ordering welded parts, one of the first questions you’ll be wondering is whether your project calls for MIG or TIG welding. Rest assured, our experts will always recommend the most optimal process for the job at hand. But if you want to be able to reach that decision yourself, read on to learn more about when to choose MIG vs. TIG welding.
MIG and TIG Welding 101: How Each Process Works
MIG stands for “Metal Inert Gas” which is also known as “Gas Metal Arc Welding” or GMAW. The MIG process uses a continuously fed wire electrode and a shielding gas to join metals. The process is fast, relatively easy to automate, and well-suited for high-volume production. You could think of it as the workhorse of the welding world.
TIG stands for “Tungsten Inert Gas” which is also known as “Gas Tungsten Arc Welding” or GTAW. The TIG process uses a tungsten electrode, and the welder typically feeds filler metal by hand. It takes more skill and time, but produces precise, clean welds with superior appearance and control. That’s where TIG welding’s “high-strength, high-precision” reputation comes from.
Speed and Cost: Where MIG Has the Edge
When you want maximum throughput and/or minimal cost-per-part, MIG is usually the go-to choice. The continuous wire feed means a welder can cover more ground in less time, which translates directly to lower labor costs. That only turns into an even bigger advantage on large quantities or thicker structural steel.
For example, projects like heavy equipment brackets, steel frames, or structural assemblies, MIG delivers solid, reliable joints at a pace that keeps your budget in check.
Quality and Precision: Where TIG Becomes Necessary
TIG earns its premium when precision, appearance, and weld integrity are non-negotiable. Essentially, our TIG welders can carefully control every variable: heat input, filler addition, travel speed. That’s how TIG produces cleaner, narrower welds with minimal spatter and a much lower risk of contamination. The heat-affected zone is also smaller, which especially matters on thin-gauge materials or parts with tight tolerances.
One unique benefit for highly regulated industries: TIG welds are also easier to inspect and hold up better under radiographic or dye penetrant testing. That’s another reason you’re more likely to see TIG welds in industries like aerospace and defense products, or food processing where strict certifications are required.
Material Considerations: Matching the Process to What We’re Welding
Despite all the different advantages, drawbacks, and considerations above, material type is often the deciding factor.
- Mild Steel – MIG is usually the right call, especially on thicker sections. It’s efficient and produces strong, consistent welds.
- Stainless Steel – Either process can work, but TIG is preferred when appearance and corrosion resistance are critical factors. MIG stainless is faster but often requires more post-weld cleanup.
- Aluminum – This is where TIG really earns its place. Aluminum is highly sensitive to heat and contamination, and TIG gives the welder precise control over both. MIG can be used on thicker aluminum sections, but for most precision aluminum fabrication, TIG produces a stronger, cleaner result with far fewer defects. At S&W, the majority of our aluminum work is TIG welded for exactly this reason.
Partner with a Fabrication Shop That Masters Both Processes
Of course, the best fabricators don’t have a preference in welding process…they have the capability to match the process to the project at hand.The S&W Metal Products welding team works with customers from the early design stage to ensure the right process is specified from the start. Getting that right means better parts, fewer revisions, and a smoother path from prototype to production.
Get in touch to get the ball rolling on your project.
