This Simple Welding Mistake Can Gas You at Home | Auto Expert John Cadogan
Apr 29, 2026•Channel
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Published2 months ago
Duration20:05
Video IDhGUt9u9SXJg
Languageen
CategoryAutos & Vehicles
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Video TypeRegular Video
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Views9K
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Comments60
Engagement Rate5.39%
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Clean metal matters when you’re welding.
But if you use the wrong brake cleaner to get there, you can create something far worse than a dirty weld.
Some brake cleaners contain chlorinated solvents like tetrachloroethylene, trichloroethylene, or methylene chloride. They’re effective degreasers — and non-flammable — which sounds ideal in a workshop.
Until you add heat.
Under welding conditions, these chemicals can break down and form phosgene (carbonyl chloride) — a highly toxic gas responsible for tens of thousands of deaths in World War I. It doesn’t always hit you straight away, either. Symptoms can be delayed, and by the time they show up, the damage is already done.
There’s no antidote. Treatment is supportive only.
If you weld, fabricate, or work on cars, this is a mistake you can make without realising it — especially if your cleaning and welding happen in the same space.
Weld-safe checklist:
Use non-chlorinated brake cleaner only
If it doesn’t explicitly say non-chlorinated, assume it’s not safe
Let all solvents evaporate fully (don’t trust seams, cavities, or porous parts)
Final clean with acetone — then let that flash off completely
Keep cleaning and welding physically separate
If you didn’t clean it yourself, assume it’s contaminated
This is not a second-chance scenario.
Chlorinated solvents + heat = poison gas.
Don’t do it.
#welding #mechanic #diy #cars #workshop #safety #fabrication #tools