But fluid in your lungs can kill you. When carbon dioxide is used for shielding, carbon monoxide can form and kill you. The welding arc can form ozone and nitrous oxides from the air. MIG and TIG welding make the most ozone, most of all when aluminum is welded. These fumes irritate the eyes, ear, nose, throat, and lungs and can damage the lungs.
Nitrous oxides can cause fluid in the lungs.
OSHA says you must remove all paint and solvents before welding or torch cutting. Follow written instructions. Make sure all residues are removed. Use the safest welding method for the job. Stick welding makes much less fume than flux core welding.