Troubleshooting
Why is my mig welding blow-through / burn-through?
Quick answer
Blow-through / burn-through in mig welding usually means too much current or too slow travel on thin sheet. For this process, drop amps and stitch weld before touching anything else.
The specific fix
Drop amps and stitch weld. The general rule: drop amps, move faster, use skip welding, or tack tighter and stitch.
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