The creation of a joint using a filler of similar composition to the metal being joined gives rise to fumes from the electrode coatings, metallic oxides, any paint or surface contaminant and possibly to ozone and nitrogen oxides.

The creation of a joint using a filler (welding rod) of similar composition to the metal being joined, using electricity to generate an arc.

This is a new document explaining the need for controlling the fumes generated by welding steel.

It gives some solutions to managing the problem of extraction.

The cutting of metals by means of a plasma arc that produces a high-temperature stream of ionised gas capable of cutting metal. Hand-held torches usually use compressed air as the gas but mixtures of argon and either hydrogen or nitrogen may occasionally be used.