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Gas or gasless MIG welder for UK sites

Updated: 21 October 2026

You are choosing between flux-core wire that shields itself and a gas bottle that keeps spatter down, often on the same amazon.co.uk listing that claims both. This page is about site, wind and year-one cost. It is not a repeat of the product matrix on the [MIG/MAG welding machine comparison](/hub/soldering-and-welding/mig-mag-welding-machine). Gasless in these hobby listings means flux-core: the flux inside the wire creates slag and shielding as it burns. Gas MIG, MAG on steel, feeds solid wire while a CO₂ or argon mix flows through the torch. A farm gate at the field edge is a different problem from a patch on thin car skin in a still garage.

You are choosing between flux-core wire that shields itself and a gas bottle that keeps spatter down, often on the same amazon.co.uk listing that claims both. This page is about site, wind and year-one cost.

Our top picks

FEIFANKE FEIFANKE MIG145

Best overall

FEIFANKE FEIFANKE MIG145
8.0/10about £189.99
View offer
HITBOX HITBOX HBM200 gasless MIG welder

Rank 2

HITBOX HITBOX HBM200 gasless MIG welder
9.0/10about £99.99
View offer
HZXVOGEN HZXVOGEN MIG145II

Best value

HZXVOGEN HZXVOGEN MIG145II
8.6/10about £99.99
View offer
On this page
  1. 1.Flux-core for outdoor and draughty work
  2. 2.Gas MIG for cleaner indoor work
  3. 3.Running costs and kit overlap
  4. 4.What the comparison rows imply
  5. 5.Pick a path for the next job

Flux-core for outdoor and draughty work

Flux-core tolerates wind that would blow gas shielding away. Gate work on a 230 V inverter then skips winter regulator problems and a bottle in the boot. You still get spatter, slag and smoke. HSE WL3 treats that fume as needing control. No bottle does not mean no fume. On 2–4 mm mild steel, synergic flux-core on the HITBOX and HZXVOGEN rows draws praise for first DIY beads. Sticky feed on stitch work is the recurring complaint. Grind a clean path on rusty plate. Stick can still beat wire on heavy scale if you already own rods.

Gas MIG for cleaner indoor work

Gas MIG on thin sheet leaves less slag when the joint is indoors, the air is still and the metal is clean. Car patches and furniture frames are the usual reason to buy an argon-rich mix and solid wire. UK buyers often add about £40–£120 for a bottle, a regulator and a first spool when the machine only ships a hose. A breeze across a driveway can porosity a bead that looked fine in the shed. On open air, default to flux-core unless you screen the joint.
FEIFANKE FEIFANKE MIG145

Testsieger

FEIFANKE FEIFANKE MIG145
8.0/10about £189.99
View offer

Running costs and kit overlap

Flux-core tips wear with spatter. Gas adds rental or refill, plus a leak check at the regulator. MMA on the same box lets you burn rods when the cylinder is empty. FEIFANKE and some HZXVOGEN kits list both flux and solid samples. Reboot mid-tier rows emphasise a gas hose. Match the bottle thread to a UK regulator. Changing process means a liner check, a purge and scrap beads. Setup once you have chosen is on how to use a MIG welder.

What the comparison rows imply

Every wire-capable row lists flux-core and gas MIG, except the DEKO, which is stick and lift TIG. Do not plan this choice on that SKU. The HITBOX at about £99.99 has the deepest UK file, mainly flux-core praise. The HZXVOGEN 145 and 205 A rows share synergic themes and manual complaints. Reboot 210 A buyers mention both processes in a thin sample. None of the eight prints a dealer-style duty cycle. Rest the inverter on a long run either way. Outdoor work still needs respiratory protection when wind scatters fume.

Pick a path for the next job

If the next jobs are gates or trailers outside, match flux-core to the roller, skip the bottle, and spend on a helmet and fume control. If they are indoor furniture or thin car metal in still air, order gas and solid wire, leak-test, and practise on offcuts first. If you need both, learn flux-core on a dual-mode row first. It is cheaper per metre in wind. Add gas when the work moves indoors.

Common questions

Can I use gas MIG outside in the UK?
Only with wind screens and calm conditions. Otherwise use flux-core. Porosity from blown shielding wastes time and gas. A bead that looked sound in the shed can honeycomb on an open driveway in a light breeze.
What gas mix for mild steel?
CO₂ or argon blends sold for MIG on steel are common in UK hire shops. Match the regulator and hose to the bottle thread, and follow the supplier label. Do not copy a US mix from a forum post onto a UK cylinder without checking the thread and the data sheet.
Does flux-core need ventilation?
Yes. Fume still needs HSE-aligned controls in an enclosed space. An open door is rarely enough in a single garage bay. Outdoor flux-core still produces fume. Plan respiratory protection for the bay you actually use, not for an ideal workshop.
Can one machine do both?
Most rows here list both modes. The setup and the consumables differ. Budget time to learn flux-core before you add gas. A dual-mode title does not mean both paths are ready on day one if the bottle and the solid wire are missing.
Why do listings say gasless and still ship a gas hose?
The marketing bundles both paths. The hose does nothing until you supply a bottle and a regulator. Check the included-components line for wire, tips and a hose, then price the cylinder separately.
Which row has the strongest gasless evidence?
Review depth favours the HITBOX row for flux-core comments. The HZXVOGEN 145 matches the price, with a lighter cabinet and more complaints about the manual. Conditions for each pick sit on the best-of page for this set.

Related pages

MIG welder buying guide

Best MIG/MAG welders in this set

Mig/mag welding machine

MIG welder for aluminium UK: liner, roller and gas

How to use a MIG welder on a UK 13 A garage supply

Sources

Sources taken from the research digest. Listings were checked on 19–20 October 2026.

  1. HSE — WL3 welding fume control (retrieved 20.10.2026)
  2. HSE — Mild steel welding fume (retrieved 20.10.2026)
  3. HSE — COSHH welding (retrieved 20.10.2026)
  4. Machine Mart — Welding buyer's guide (retrieved 20.10.2026)
  5. Tooldeck — Gas vs gasless MIG (retrieved 20.10.2026)
  6. Basic Welding — MIG for beginners (retrieved 20.10.2026)
  7. GOV.UK — Electrical Equipment (Safety) Regulations 2016 (retrieved 20.10.2026)