Two Processes, Very Different Outcomes
Welding decisions in food and beverage manufacturing fabrication are rarely just about joining two pieces of metal together. The choice between TIG and MIG welding affects weld quality, surface finish, hygiene compliance, and long term durability, all of which matter significantly in an FMCG environment where equipment is regularly exposed to wash down, caustic cleaning chemicals, and strict hygiene standards. At BevTech, an engineering business with an in house machine shop and TIG and MIG welding capability, choosing the right process for each job is a genuine technical decision, not a default habit, and understanding the difference is useful for any plant manager scoping a fabrication project.
How TIG Welding Works
Tungsten inert gas welding, commonly known as TIG, uses a non consumable tungsten electrode to produce the weld, with a separate filler rod fed in by hand where additional material is needed. The process is shielded by an inert gas, typically argon, and gives the welder precise, direct control over heat input and weld pool formation. TIG welding produces a clean, controlled weld with minimal spatter, and because the process does not rely on a continuously fed consumable wire, it allows for very fine control over bead appearance and penetration.
This precision comes at the cost of speed. TIG welding is generally slower than MIG welding, requiring more skill and a steadier hand from the welder, since heat input, filler addition, and torch movement are all managed manually and simultaneously.
How MIG Welding Works
Metal inert gas welding, or MIG, uses a continuously fed consumable wire electrode along with a shielding gas, typically a mix of argon and carbon dioxide for steel. Because the filler wire feeds automatically through the welding gun, MIG welding is generally faster and more forgiving than TIG, making it well suited to production environments where welding speed and throughput matter, and where slightly less precise bead control is an acceptable trade off.
MIG welding is also generally easier to learn to a competent standard than TIG, which is part of why it remains the default process for a significant proportion of structural and general fabrication work across engineering more broadly.
Why the Choice Matters More in FMCG Fabrication
In a food and beverage manufacturing context, welds are frequently exposed to wash down regimes involving high pressure water, caustic and acid based cleaning chemicals, and repeated thermal cycling from hot water rinse and clean in place processes. A weld with poor surface finish, undercut, or trapped porosity is not just a cosmetic issue in this environment, it can become a hygiene risk, providing a location for bacterial growth or product residue to accumulate, and a durability risk, providing a starting point for corrosion under repeated chemical exposure.
This is a key reason why TIG welding is often the preferred process for stainless steel fabrication in food and beverage applications, particularly for product contact surfaces, pipework, and equipment requiring a smooth, easily cleanable finish. The precise, controlled nature of TIG welding produces the clean, consistent weld beads that hygiene compliant fabrication genuinely requires.
Where MIG Welding Remains the Right Choice
TIG welding is not automatically the correct choice for every job, and defaulting to it unnecessarily adds cost and time without a corresponding benefit. Structural fabrication work, such as equipment frames, guarding, platforms, and non product contact structural components, is frequently better suited to MIG welding, where speed and cost efficiency matter more than the fine surface finish TIG delivers. For carbon steel fabrication that will be painted or coated rather than left as a hygiene critical surface, MIG welding is often the more practical and cost effective process.
An experienced fabrication team makes this decision based on the specific requirements of each component, whether it is a product contact surface requiring hygiene compliant finish, or a structural component where fabrication speed and cost are the priority, rather than applying a single process across every job by default.
Material Considerations: Stainless Steel and Aluminium
Material choice also influences the TIG versus MIG decision. Stainless steel, the dominant material in food and beverage product contact equipment, welds particularly well with TIG, given the control it offers over heat input and the resulting weld quality on thinner gauge stainless sheet and pipe common in FMCG fabrication. Aluminium, used in some lighter weight equipment and guarding applications, can be welded with either process, though TIG again tends to offer superior control for thinner sections and applications where finish quality matters.
The Value of In House Fabrication Capability
For FMCG manufacturers, having an engineering partner with genuine in house TIG and MIG welding capability, alongside broader mechanical fabrication resources including CNC machining, mills, lathes, and brake presses, means fabrication decisions can be made based purely on what each specific job requires, rather than being constrained by which process a particular subcontractor happens to offer. BevTech’s combined mechanical, electrical, and automation capability means welding decisions are made as part of a broader, coordinated engineering solution, whether that is fabricating a replacement component for a hot water rinse system, or building structural guarding as part of a machine safety upgrade.
Cost Comparison Between the Two Processes
The cost difference between TIG and MIG welding on a given job is driven primarily by labour time rather than consumables, since TIG welding’s slower, more controlled process translates directly into more welder hours for a comparable length of weld. For a small, hygiene critical component, such as a repair to a section of stainless product pipework, this additional labour time is a reasonable cost to accept given what is at stake if the weld quality is insufficient. For a large structural fabrication job, such as a full equipment guarding frame, the labour cost difference across the total length of welding involved can become significant, reinforcing why MIG welding remains the sensible default for this category of work.
An experienced fabrication team factors this cost difference into project quoting from the outset, recommending TIG welding only where the hygiene, finish, or precision requirements genuinely justify the additional cost and time, rather than applying it uniformly regardless of the application.
Welder Qualification and Standards Compliance
Both TIG and MIG welding used in FMCG fabrication should be performed by welders holding appropriate qualifications relevant to the materials and standards involved, particularly for pressure equipment, structural components, or product contact surfaces subject to food safety requirements. BevTech’s welding team holds qualifications appropriate to the stainless steel and structural fabrication work regularly undertaken for FMCG clients, and welding procedures for critical applications are documented and controlled to ensure consistent, verifiable quality, rather than relying purely on individual welder skill without supporting process control.
Getting the Right Weld for the Right Job
The TIG versus MIG decision is a genuine technical judgement, informed by the material, the surface finish and hygiene requirements, and the balance between quality and production speed each project demands. For FMCG manufacturers scoping a fabrication or repair project, working with a team that understands and applies this judgement correctly, rather than defaulting to a single process, is a meaningful factor in long term equipment reliability and hygiene compliance. To discuss a fabrication project with BevTech’s in house welding and machining team, contact 25 Silvio St, Richlands QLD 4077, or admin@bevtech.com.au.