Troubleshooting
Why is my mig welding porosity?
Quick answer
Porosity in mig welding usually means gas shield interrupted — wind, empty bottle, loose fittings, or dirty/oily steel. For this process, check gas flow and wind first before touching anything else.
The specific fix
Check gas flow and wind first. The general rule: check gas first: flow, leaks, leaks at the regulator; shelter the arc; clean the joint.
Process checklist
- Stick-out too long — keep 8–10 mm from nozzle to work for a stable arc
- Travel too slow on thin sheet, burning holes instead of building a bead
- Wrong wire size for the job — 0.9 mm covers most hobby work in Australia
Spot an error? Report it — corrections carry a dated note on our verification ledger.