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MIG Welding Wire NZ

MIG welding wire for mild steel, stainless and aluminium, plus gasless MIG wire for welding outdoors without a bottle, from $27 to $175. Diameters run 0.6mm to 1.2mm, in small 0.5kg to 1kg rolls for the odd job and 5kg and 15kg spools for the workshop. 0.8mm and 0.9mm suit thin sheet and most home machines. Match the wire to your MIG welder. Gas or gasless? Our beginner's guide to welding covers the difference.

Frequently Asked Questions

What size MIG wire should I use?
0.6mm for thin sheet under 1.5mm. 0.8mm for most home and farm machines on steel up to about 6mm. 0.9mm once you are on a 180A plus machine welding 3 to 10mm plate. 1.0 and 1.2mm are for industrial machines. If you only buy one spool, 0.8mm is the safe bet.
Gasless or gas MIG wire?
Gasless flux cored wire needs no gas bottle, works outdoors in wind and penetrates well on rusty steel, with more spatter and slag to chip. Solid wire with argon mix gas gives cleaner, prettier welds indoors on clean steel. Gasless runs electrode negative, so swap the polarity on your machine when you change over. Our welding guide walks through both.
Can I MIG weld stainless steel with regular wire?
No. Mild steel wire on stainless gives a weld that rusts and cracks. Use 308L wire for 304 stainless or 316L for 316, with argon based gas. Both stainless wires are in this range.
Do you push or pull when MIG welding?
Push with solid wire and gas, it gives a flatter, cleaner bead. Drag, or pull, with gasless flux cored wire so the slag stays behind the weld pool.
Why does my MIG weld not penetrate?
Amps too low, wire speed too high, travelling too fast, dirty or painted steel, or the wrong polarity for the wire. Fix the metal prep first, then turn the voltage up a step and slow the wire until the arc stops stuttering.
How long does a spool of MIG wire last?
A 1kg roll of 0.8mm covers the odd repair over a few months. A 5kg spool gives a home workshop several weekends of welding. Fabricators go through 15kg spools, which are also the cheapest per kilo.

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