A metal being welded oftentimes contains lubricant, oil, dust or paint. When vaporized, these substances can become highly toxic. They generate carcinogenic decomposition products such as formaldehyde or polycyclic aromatic hydrocarbons (PAHs) added to dust, chromium, iron, nickel and cadmium oxides.
Welding fumes toxicity
The International Agency for Research on Cancer (IARC) classifies welding fumes in the 2B category – possibly carcinogenic to humans. When inhaled, they cause dizziness, headache or eye irritation. Chronic exposure can injure breathing tracts and the nervous system. In addition to classic toxic gas and fumes hazard, TIG and MIG welding can provoke asphyxia through inert gases when performed in confined spaces.
Welding respiratory protection
Many respiratory protection devices are available for an efficient welding breathing protection. From the classic full face mask equipped with a welding specific visor, to powered air purifying respirators with specific welding hoods.
This is a respiratory protective mask enhanced with a specific welding visor directly engaged onto the mask. Two air purifying filters are available for this unit: the P3 cartridge to filter 99,97% of dust or the A2B2-P3 combined cartridge which is highly recommended in case there is any lubricant, oil or paint on the metal being welded.
Welding powered air purifying respirator
A powered air purifying welding mask (or PAPR welding mask) features a positive pressure system. This means that the breathing effort is reduced thanks to a motor that injects filtered air directly into a face piece. Several face pieces are compatible, especially PAPR welding hoods with optoelectronic lenses and welding helmets with respirators. This very comfortable equipment is ideal for long duration work.
Welding air supplying respirator
When oxygen rate is below 19% volume – while welding in confined space or long and thin pipes – wearing an air purifying respirator mask for welding is prohibited. Welding SCBAs (self-contained breathing apparatus) and supplied air respirators operate through the same process than a welding gas mask: a welding visor is directly engaged onto the breathing protective mask.