Yes, you can weld a broken steel workbench leg back together — and for many handy Kiwis with access to a welder, it's a satisfying and cost-effective repair. That said, the quality of the fix depends heavily on your welding experience, the equipment you use, and how well you prepare the joint. A poorly welded leg can fail under load, so it's worth doing it properly.
Is This a Job for a DIYer?
Welding a steel workbench leg is not restricted work under New Zealand law — unlike electrical, gas, or plumbing work, there's no licensing requirement for general steel welding on personal property. However, that doesn't mean it's without risk. Welding involves intense heat, UV radiation, fumes, and fire hazards, so proper safety precautions are essential.
If you've welded before and feel confident, this is a manageable DIY project. If you've never struck an arc, a broken workbench leg probably isn't the best place to start — consider taking a short introductory welding course first, or calling in a local tradesperson.
What Type of Steel Is Your Workbench?
Before you start, identify what you're working with. Most steel workbenches are made from mild steel (also called low-carbon steel), which is the most forgiving and easiest material to weld. It's commonly used in RHS (rectangular hollow section) and SHS (square hollow section) tubing found in workshop furniture.
If your bench is older or imported, it could be a higher-carbon or alloy steel — these can crack if welded without pre-heating. When in doubt, check with a qualified welder or metal supplier.
Equipment You'll Need
- Welder: A basic MIG welder (also called GMAW) is the most beginner-friendly option for mild steel and is widely available from stores like Bunnings or Mitre 10. A stick welder (SMAW) also works well for thicker sections.
- Wire/electrodes: Use ER70S-6 MIG wire or 6013 stick electrodes for mild steel — both are widely available in NZ.
- Angle grinder: For cleaning and preparing the joint before welding, and for grinding the weld flush afterwards if needed.
- Clamps or magnets: To hold the leg in position while you tack-weld it.
- PPE: Welding helmet (auto-darkening is ideal), leather gloves, welding jacket or heavy cotton clothing, and steel-capped boots.
Step-by-Step: Welding the Leg
1. Prepare the Joint
Clean both broken surfaces thoroughly with an angle grinder or wire brush. Remove any rust, paint, grease, or galvanising. Never weld galvanised steel without removing the zinc coating first — the fumes produced are toxic and can cause serious illness.
2. Align and Clamp
Position the leg so the break is properly aligned. Use clamps, a vice, or magnetic welding squares to hold everything square. Check alignment with a spirit level or square before you commit.
3. Tack Weld First
Place small tack welds at two or three points around the joint to hold it in position. Check alignment again — heat can cause movement.
4. Run Your Full Welds
For hollow section tubing, weld all the way around the joint in sections, allowing the metal to cool slightly between passes to reduce distortion. Aim for consistent penetration and a smooth bead.
5. Inspect and Finish
Once cool, inspect the weld for porosity, cracks, or undercut. Grind back any high spots if needed. If the leg will be under significant load, consider adding a gusset plate — a small triangular piece of steel welded across the joint for extra strength.
Safety First
Welding hazards are real. Always work in a well-ventilated area to avoid fume inhalation — this is especially important in enclosed garages or sheds. Keep a fire extinguisher nearby, clear flammable materials from the area, and never weld near LPG cylinders or fuel containers. For more on workshop safety, WorkSafe NZ has useful guidance on hazardous work environments.
If you're removing paint before welding, be aware that older paints may contain lead. Check WorkSafe NZ for advice on working safely with potentially hazardous coatings.
Finishing the Repair
Once you're happy with the weld, clean up the area and apply a rust-inhibiting primer followed by a topcoat. Resene and Wattyl both offer suitable metal primers and paints for workshop use. This protects the bare steel and keeps the repair looking tidy.
When to Call a Professional
Call a qualified welder if:
- You've never welded before and the bench will carry heavy loads or be used in a commercial setting.
- The steel is thick (over 6mm), heavily corroded, or you're unsure of the material type.
- The break is in a complex location or involves multiple components.
- You need a structurally certified weld (for example, if the bench is bolted to a wall or floor as part of a workshop fit-out).
- You don't have access to appropriate PPE or a safe workspace.
A professional welder can assess the break, choose the right process, and guarantee a strong, safe repair. You can find qualified local welders on tradedirectory.co.nz.
Site Safe
SiteWise
ISO 9001
