Buying your first welder is an exciting step, but with so many types and brands on the market it can be hard to know where to start. The good news is that for most Kiwi homeowners tackling DIY repairs, farm jobs, or trailer builds, there's a straightforward answer. This guide walks you through the main welder types, what to look for, and how to stay safe in the shed.
The Main Types of Welder for Beginners
There are three welding processes worth knowing about as a beginner:
- MIG (Metal Inert Gas / GMAW): Uses a continuously fed wire electrode and a shielding gas (usually a CO₂/argon mix). MIG is widely considered the easiest process to learn — you can lay a decent bead relatively quickly. Great for mild steel, sheet metal, and general repairs.
- Flux-Core (FCAW): Similar to MIG but uses a hollow wire filled with flux instead of external shielding gas. Works well outdoors or in windy conditions. A good budget entry point since you don't need a gas bottle.
- Stick (MMA / Arc): Uses a consumable electrode rod. More versatile in rough conditions and works on rusty or dirty metal, but has a steeper learning curve. Solid choice for farm and structural work.
For most beginners, a MIG welder is the recommended starting point. The process is forgiving, the equipment is widely available, and you'll find plenty of tutorials to help you improve.
What Power Supply Do You Have?
Before you buy anything, check your power supply. Most entry-level MIG and flux-core welders run on a standard 230V single-phase household circuit — the same outlet you'd plug a dryer into. Heavier machines may require a dedicated circuit or three-phase power, which most homes don't have.
If you're only running off a standard 10-amp household outlet, look for a welder rated at 120–150 amps or less. These are perfectly capable of welding mild steel up to around 6mm thick, which covers the vast majority of DIY jobs. Always check the duty cycle rating too — this tells you how long the machine can weld continuously before needing to cool down.
Key Features to Look for
When comparing machines at Bunnings or Mitre 10, keep an eye on these specs:
| Feature | What to Look For (Beginner) |
|---|---|
| Amperage range | At least 30–150A for versatility |
| Duty cycle | 20–30% at max amps is typical for entry-level |
| Wire feed speed control | Variable, not just high/low |
| Voltage steps | More steps = finer control |
| Thermal overload protection | Essential — protects the machine |
| Included accessories | Earth clamp, torch/gun, mask |
A variable wire feed speed and multiple voltage steps make a big difference when you're learning. Machines with only two or three settings are frustrating to dial in.
Shielding Gas or No Gas?
If you go the MIG route, you'll need to decide whether to run gas-shielded MIG or gasless flux-core. Gas-shielded MIG produces cleaner, neater welds and less spatter — ideal if you care about finish. However, you'll need to hire or buy a gas bottle and regulator, which adds to your setup cost.
Flux-core (gasless) is cheaper to get started with and handles outdoor conditions better. The trade-off is more spatter and a slightly rougher weld bead. For structural or cosmetic work, gas-shielded MIG wins. For rough farm repairs or outdoor use, flux-core is a practical choice.
Many entry-level MIG machines sold in NZ are MIG/flux-core combo units, so you can start gasless and add gas later — a smart way to spread the cost.
Safety in the Shed
Welding produces UV radiation, fumes, spatter, and intense heat — all of which can cause serious injury if you're not prepared. Before you strike your first arc:
- Always wear an auto-darkening welding helmet — a shade 9–13 lens is standard for MIG/stick.
- Wear leather gloves, a welding jacket or heavy cotton clothing, and closed-toe boots.
- Ventilate your workspace — welding fumes are hazardous. Work outdoors or use extraction fans. Never weld galvanised steel without serious respiratory protection, as zinc fumes are toxic.
- Keep a fire extinguisher nearby and clear flammable materials from the area.
- Check WorkSafe NZ for guidance on safe welding practices in home workshops.
Budget: What Should You Expect to Pay?
As a rough guide only, entry-level MIG/flux-core welders suitable for beginners typically start from around $300–$600 for a basic unit. Mid-range machines with better duty cycles and more control options sit in the $600–$1,200 range. Prices vary, so compare current stock at your local PlaceMakers, Bunnings, or Mitre 10.
Don't forget to budget for consumables: welding wire, contact tips, nozzle gel, and a decent helmet if one isn't included.
When to Call a Professional
Welding itself is not licensed work in NZ for general DIY purposes — a homeowner can weld in their own shed. However, there are important exceptions:
- Structural welding on buildings (e.g. steel framing, connections) may require work by a qualified tradesperson to comply with the NZ Building Code and NZS 3404 (steel structures).
- Pressure vessels, trailers for road use, and roll cages have specific standards and may need certified welding inspection.
- Any work involving gas lines or electrical wiring is restricted work under NZ law and must be carried out by a licensed gasfitter (PGDB) or electrician (EWRB) respectively.
If your project goes beyond basic repairs and fabrication, it's worth consulting a qualified welder. You can find experienced local welding tradespeople on tradedirectory.co.nz.