A welder works high up from the ground from the safety of a hydraulic platform on the side of a lift shaft being constructed on a large development project on London Wall in the City of London, the capital's financial district - also known as the Square Mile. With the visor of his helmet lit by the glow from his acetylene torch, the man leans towards the detail of this close-up contact job. Oxy-fuel welding (commonly called oxyacetylene welding, oxy welding, or gas welding in the U.S.) and oxy-fuel cutting are processes that use fuel gases and oxygen to weld and cut metals, respectively.
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