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MIG vs TIG for UK structural and domestic steelwork

When each process fits on domestic and structural mild-steel jobs — before you spend on a machine.

Affiliate disclosure: This page contains affiliate links. We may earn a commission if you buy through them. Nothing here is a paid ranking. Gear cards below are research / Untested — not personal on-site reviews. Process advice is general, not a welding procedure specification.

Diagram comparing MIG continuous-wire welding with TIG tungsten-and-filler welding
Original process diagram — not a photo of our welds or workshop.
Default: MIG Most UK mild-steel fab and domestic steelwork
Reach for TIG Appearance, thin plate, stainless control
Not a WPS Coded work follows your procedure / employer

Who this is for

Good fit

  • UK domestic steelwork (gates, frames, balustrades, lintels)
  • Structural fab where process choice changes the job
  • Choosing a machine or consumables with criteria first

Not this page

  • Coded work under a written WPS
  • Deep pipe / pressure TIG specialisms
  • “Best welder 2026” listicles with no process context

What MIG and TIG mean on a UK job

MIG (GMAW)

Continuous wire through a gun with shielding gas (or flux-cored). Everyday workhorse on mild steel: deposit metal, keep moving, accept more clean-up for speed.

TIG (GTAW)

Non-consumable tungsten plus separate filler. More deliberate heat and filler control — helps appearance and thin work; costs time.

UK supply note: Many shops run single-phase 240 V. Match machine and duty to the supply you actually have — this page does not certify any unit as “site-ready.”

Side-by-side

FactorMIGTIG
Speed on mild steelUsually faster depositSlower; torch + filler pace
Learning curveQuicker usable beads for manySteeper heat / coordination
Appearance / clean-upMore spatter commonCleaner when run well
Thin / stainlessPossible with careOften preferred
Outdoor / windGas shield sensitiveAlso gas-sensitive
ConsumablesWire + gas (volume adds up)Gas + filler rod
Typical UK useGates, frames, brackets, shop fabDetail, stainless, visible joints

When I’d pick which

Pick MIG when…

  • Speed and deposition beat mirror finish
  • Longer joints or repetitive pieces
  • You’re building toward production pace
  • Logistics are already wire-oriented

Pick TIG when…

  • Appearance or minimal dressing matters
  • Thin material or stainless is the bottleneck
  • Short precise joints, not long runs
  • You’ll trade time for control

Multi-process boxes

One unit that claims MIG + TIG + stick can suit a small shop that needs flexibility. Expect trade-offs on duty cycle and how good each process feels versus a dedicated machine. Treat “3-in-1” marketing as a checklist, not a recommendation.

Gear picks Untested

Research placement only (named for this page). No on-site use claims. Links go to Machine Mart via Awin.

Clarke MIG107 No Gas/Gas 100Amp Welder product image
Pick A

Clarke MIG107 No Gas/Gas 100Amp (230V)

MIG starter path for light–medium mild-steel domestic/structural fab; gas/no-gas flexibility on UK 13A/230V.

Untested View on Machine Mart
GYS MultiPearl 210-2 multi-process inverter product image
Pick B

GYS MultiPearl 210-2 MIG/TIG/MMA

Multi-process option when MIG plus occasional TIG/MMA versatility matters in shop/maintenance work.

Untested View on Machine Mart
Clarke CHT102 C-type welding clamps product image
Pick C

Clarke CHT102 C-type clamps

Holding steel for tacking/fit-up during fab. Complements the process page — not a welder.

Untested View on Machine Mart

FAQ

Is MIG or TIG better for UK mild-steel domestic steelwork?

For most UK mild-steel gates, frames, and everyday structural fab, MIG is the usual default because of deposition speed. TIG is often preferred when appearance, thin plate, or stainless control matters more than pace. Neither is a universal rule; coded work follows your WPS.

When should I choose TIG instead of MIG?

Reach for TIG when joint appearance, thin material, or stainless heat control is the bottleneck, and you can trade time for control. Short precise joints suit TIG better than long production runs.

Can a multi-process MIG/TIG/MMA machine replace dedicated units?

A multi-process box can suit a small shop that needs flexibility. Expect trade-offs on duty cycle and how good each process feels versus a dedicated machine. Treat three-in-one marketing as a checklist, not a recommendation.

Does this page replace a welding procedure specification?

No. Process advice here is general research for UK domestic and structural mild-steel jobs. Coded or contract work follows your written WPS and employer procedures.

Have Site Fab Notes tested the welders listed on this page?

No. Product cards are labelled Untested research placements with Machine Mart affiliate links. We do not claim on-site use of the named machines.

Related notes

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