Safety
Why do welders drink milk after welding?
Quick answer
Milk does nothing to protect you from welding fume — that's a myth with no clinical basis. It dates from the idea that calcium 'binds' toxins. The real fix for fume exposure, including zinc from galvanised steel, is ventilation, extraction and the right respirator — not a milk carton.
Where the myth comes from
Old boilermakers swore by milk to take the edge off 'metal fume fever' — the flu-like illness from welding galvanised steel. Zinc oxide fume genuinely causes it; calcium genuinely doesn't treat or prevent it. The placebo and the timing (symptoms pass in a day or two regardless) kept the myth alive for decades.
What actually protects you
- Local fume extraction at the arc — the single biggest upgrade a home workshop can make
- A fitted P2 respirator (or powered air for daily work) under the helmet
- Weld outdoors or with cross-ventilation when extraction isn't available
- Grind the galvanising off the weld zone where practical — the cheapest control of all
When to take symptoms seriously
metal fume fever: fever, chills and aches hours after welding galvanised metal — it passes, but it's a warning, not a rite of passage. Persistent cough or breathlessness after welding deserves a GP visit; tell them you're a welder. Safe Work Australia treats welding fume as a carcinogen — treat exposure accordingly.