Yes, in most cases a New Zealand farmer or homeowner can legally weld their own steel livestock feeder on the farm — welding farm equipment and structures for your own use is generally not restricted work under NZ law. That said, doing it safely and to a decent standard requires the right gear, some solid technique, and a good understanding of the risks involved. Here's what you need to know before you strike an arc.
Is Farm Welding Legal for Homeowners in NZ?
Unlike electrical or gas work, welding is not a licensed trade in New Zealand for general fabrication purposes. There is no legal requirement to hold a welding certificate to repair or build your own farm equipment such as livestock feeders, troughs, gates, or yard panels — provided the work is for your own use and not a commercial product being sold or used in a public setting.
However, if your welding involves pressure vessels, lifting equipment, or structural work on a building, different rules may apply. Always check with your local council and refer to MBIE Building Performance if you're unsure whether your project requires a building consent or needs to meet specific standards.
What Equipment Do You Need?
For welding a steel livestock feeder, you'll typically use one of these common processes:
- MIG (GMAW) welding — easiest for beginners, good for mild steel, widely available. Machines are sold at Bunnings and Mitre 10.
- Stick (SMAW) welding — robust and works well outdoors in wind, ideal for farm conditions.
- TIG (GTAW) welding — produces clean welds but has a steeper learning curve; generally overkill for a basic feeder.
For a typical mild steel feeder (RHS, flat bar, or angle iron), a decent MIG or stick welder will do the job well. Make sure your machine is rated for the material thickness you're working with — most livestock feeders use 3–6 mm steel.
Other equipment you'll need:
- Auto-darkening welding helmet (shade 9–13)
- Welding gloves and leather apron or jacket
- Angle grinder with cutting and grinding discs
- Steel wire brush and chipping hammer
- Clamps and a flat work surface or welding table
- Fire extinguisher nearby
Choosing the Right Steel and Consumables
For a livestock feeder, mild steel (such as Grade 250 or 350) is the standard choice — it's affordable, widely available, and easy to weld. Avoid galvanised steel where possible; welding it releases zinc fumes, which can cause metal fume fever. If you must weld galvanised steel, grind the coating back at least 50 mm from the weld zone and ensure excellent ventilation.
Match your filler wire or electrodes to your base metal. For mild steel MIG welding, ER70S-6 wire with C25 gas (75% argon / 25% CO₂) is a common choice. For stick welding, E6013 or E7018 electrodes suit most farm fabrication work.
Key Welding Tips for a Livestock Feeder
- Fit-up matters — take time to cut and fit your pieces accurately before welding. Poor fit-up leads to weak, ugly welds.
- Clean your steel — remove rust, paint, oil, and mill scale from the weld area with an angle grinder or wire brush.
- Tack weld first — tack all joints before running full beads to control distortion.
- Weld in short runs — alternate sides and sections to minimise warping on longer sections.
- Check penetration — a good weld fuses into both pieces of steel, not just sitting on top.
- Grind and inspect — after welding, grind smooth any sharp edges that could injure stock or handlers.
Safety on the Farm
Welding carries real risks. Follow these non-negotiables:
- Never weld near flammable materials — hay, fuel, and dry grass are serious fire hazards. Clear a safe zone and have a fire extinguisher on hand.
- Protect your eyes and skin — UV radiation from the arc causes arc eye and skin burns. Always wear your helmet and cover exposed skin.
- Ventilate your workspace — welding fumes are hazardous. Work outdoors or in a well-ventilated shed. Refer to WorkSafe NZ for guidance on managing welding fumes safely.
- Secure your workpiece — clamp or brace the feeder so it can't shift while you're welding.
- Electrical safety — keep leads and the welder away from water. Never weld in wet conditions.
Finishing and Protecting Your Feeder
Once welded, grind off any spatter and sharp edges. For longevity in NZ's variable climate, apply a rust-inhibiting primer followed by a topcoat. Resene and Wattyl both offer suitable metal primers and topcoats. For feeders that will be in constant contact with feed or water, check that your chosen paint is safe for use around livestock once cured — read the product data sheet carefully.
For extra protection in coastal or high-humidity environments, consider having the finished feeder hot-dip galvanised by a local galvanising company after fabrication.
When to Call a Professional
While DIY farm welding is perfectly legal and practical for many farmers, there are times when it pays to bring in a qualified tradesperson:
- You're new to welding and the feeder design is complex or load-bearing
- The feeder will be used with large or heavy livestock (cattle, bulls) where structural failure could cause injury
- You need to weld stainless steel, high-strength steel, or other alloys you're unfamiliar with
- The job involves pressure vessels, trailers, or anything that may need certification
- You simply don't have the right equipment or time to do it safely
A skilled welder will produce stronger, cleaner results and can often fabricate a custom feeder faster than you'd expect. You can find qualified local welders and fabricators on tradedirectory.co.nz.
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