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welding services guide: mig, tig & robotic.

A plain-English guide to welding services — how MIG, TIG and robotic welding differ, when to use each process, how welds behave across steel, stainless and aluminum, and how weld quality is inspected and certified. Written for engineers and buyers specifying a welded part.

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Welding services guide

What welding services cover.

Welding is the process of permanently joining two pieces of metal by melting them together, usually with an added filler metal that fuses into the joint as it cools. Almost every fabricated metal assembly — a frame, a bracket, a guard, a machine base, a rack — depends on welds to carry load and hold geometry. Choosing the right welding process, filler, and shielding for the material and the application is what separates a weld that merely holds from one that is strong, clean, repeatable, and inspectable.

The three arc-welding processes you will encounter most often in a fabrication shop are MIG (gas metal arc welding, or GMAW), TIG (gas tungsten arc welding, or GTAW), and robotic or automated welding, which most commonly runs a MIG process under programmed control. Each has a distinct sweet spot in speed, control, material, and volume. This guide walks through all three, how to pick between them, how welds behave on different metals, and how a quality shop proves the welds are sound.

Southern Perfection Fabrication runs welding as part of complete custom metal fabrication under one roof, with 30-plus manual MIG stations and FANUC robotic welding cells, so prototype welds and production weldments and frames come from the same building — backed by many AWS-certified welders, an ISO 9001 quality system, and CAGE code 2W654.

Process

MIG welding (GMAW).

MIG welding, formally gas metal arc welding (GMAW), feeds a continuous solid-wire electrode through the torch while a shielding gas — typically an argon/CO₂ blend — protects the molten weld pool from the atmosphere. Because the wire feeds automatically and the arc is easy to start and control, MIG is fast, productive, and relatively forgiving to learn, which makes it the workhorse process for most steel fabrication.

MIG excels on carbon and low-alloy steel and on thicker sections where deposition rate matters. It lays a lot of weld metal quickly, handles long runs and heavier plate well, and is the natural choice for structural weldments, frames, brackets, guards, and general fabrication where throughput and strength drive the job. It can also weld stainless and aluminum with the correct wire and gas, though those materials often reward the added control of TIG. MIG is the same core process that most robotic welding cells automate, which is why a shop strong in manual MIG can move a job to robotic MIG as volume grows.

Process

TIG welding (GTAW).

TIG welding, or gas tungsten arc welding (GTAW), uses a non-consumable tungsten electrode to create the arc while the welder feeds a separate filler rod by hand — decoupling heat input from filler addition. That separation gives the welder precise control over the weld pool, heat, and bead appearance. TIG is slower than MIG and demands more skill, but it produces the cleanest, most controlled, and most cosmetically consistent welds available from an arc process.

Those qualities make TIG welding services the preferred choice for stainless steel, aluminum, and thin-wall or precision parts, as well as for cosmetic welds that will be seen or must meet tight metallurgical requirements. Food, pharmaceutical, and process equipment; thin sheet assemblies; and parts where corrosion resistance and a clean, low-spatter finish matter are all classic TIG work. When a part needs both the throughput of MIG on its heavy joints and the finesse of TIG on its critical or visible ones, a full-service shop simply applies each process where it fits.

Process

Robotic & automated welding.

Robotic welding puts a MIG torch on a programmed robot arm — in our shop, FANUC robotic welding cells — with the parts held in dedicated fixtures so the robot repeats the identical weld path on every piece. The robot does not get tired, distracted, or inconsistent between the first part and the thousandth, so the weld sequence, travel speed, and heat input stay uniform across an entire production run.

That consistency is exactly why robotic welding services make sense for medium-to-high-volume production of repeatable parts: uniform weld quality, steady cycle times, and predictable cost per piece. Robotic welding also frees skilled manual welders to focus on prototypes, complex assemblies, and setup, while the cell handles the repetitive production welds. The trade-off is up-front programming and fixturing, which is why robotic welding pays back on volume rather than one-offs. Explore our dedicated robotic welding services for how automated cells fit into production weldments and frames.

Selection

Which process, when.

There is no single "best" welding process — the right choice depends on the material, the thickness, the volume, and how the weld will be judged. A few practical rules of thumb:

Choose MIG

Steel and heavier sections, long welds, prototypes and low-to-mid volume where speed and strength lead.

Choose TIG

Stainless and aluminum, thin material, precision joints, and cosmetic or corrosion-critical welds.

Choose Robotic

Repeatable parts at medium-to-high volume where uniform welds and steady cycle times pay back tooling.

Mix & Match

Complex assemblies often use MIG on structure and TIG on critical joints — applied where each fits.

Because we run manual MIG, TIG, and robotic MIG in the same shop, process selection is driven by what the part needs rather than by what a single machine can do — and a job can move from manual to robotic welding as volumes grow, without changing suppliers.

Materials

Welding by material.

Steel. Carbon and low-alloy steel is the most weld-friendly common material and the backbone of structural fabrication. It is usually MIG-welded for speed on frames, weldments, and heavier assemblies, and it takes robotic MIG well for production volumes.

Stainless steel. Stainless welds cleanly but is sensitive to heat: too much heat input can distort thin sections and harm corrosion resistance. TIG is common where appearance and corrosion performance matter, while MIG with the right wire and shielding gas handles thicker or higher-throughput stainless work.

Aluminum. Aluminum conducts heat quickly, forms a tough oxide layer, and demands clean preparation and careful technique. TIG offers the control many aluminum parts need, while aluminum MIG (with a spool or push-pull feed) supports faster, thicker work. Matching filler alloy to base alloy is essential for sound aluminum welds.

Quality

Weld quality, inspection & certifications.

A strong weld is not just a matter of the welder's hand — it is the product of a qualified welder following a written procedure and then proving the result. Good welding programs rest on a few pillars:

Certified welders. Southern Perfection Fabrication employs many AWS-certified welders, meaning their skills have been tested and qualified against recognized American Welding Society standards rather than assumed.

Weld procedures (WPS). Welding procedure specifications document the process, filler, shielding gas, joint design, and parameters for a given weld, so the same sound weld is produced repeatably by any qualified welder — not reinvented job to job.

Inspection. Finished welds are visually inspected against the print, and the dimensions of welded assemblies can be verified with CMM inspection and first-article reports so critical features are confirmed before parts ship. All of this runs under an ISO 9001 quality system, with CAGE code 2W654 supporting traceable, defense-ready work.

FAQ

Welding services — answered.

What is the difference between MIG and TIG welding?

MIG (GMAW) feeds a continuous wire electrode and lays weld fast, which makes it productive for steel and heavier fabrication. TIG (GTAW) uses a non-consumable tungsten electrode with a separate filler, giving slower but cleaner, highly controlled welds — well suited to stainless, aluminum and thin or cosmetic work.

What is robotic welding and when does it make sense?

Robotic welding uses a programmed robot arm — such as a FANUC cell — to run repeatable MIG welds on parts loaded in fixtures. It pays off on medium-to-high-volume production of consistent parts, where it delivers uniform welds, steady cycle times and repeatable quality across a run.

Which welding process is best for stainless steel and aluminum?

Stainless and aluminum are commonly TIG welded when appearance, corrosion resistance and heat control matter, and MIG welded (with the right shielding gas and wire) when speed and thicker sections are the priority. The best choice depends on the alloy, thickness and finish requirements of the part.

Are your welders certified?

Yes. Southern Perfection Fabrication employs many AWS-certified welders and works to written weld procedures, backed by an ISO 9001 quality system and CAGE code 2W654 for traceable, defense-ready work.

How is weld quality inspected?

Weld quality starts with qualified welders following documented weld procedures (WPS), then visual inspection of the finished welds against the print. Dimensional features on welded assemblies can be verified with CMM inspection and first-article reports so critical dimensions are confirmed before parts ship.

Have a welded part to quote?

Send a drawing — from a single TIG prototype to a full robotic-welding production run, we'll come back with a real price and lead time.

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