Homage to the Cube, 1988/1999
Casting the Cube, 2010
Oxyacetylene welding is a process that uses fuel gases and oxygen to weld and cut metals.
In oxyacetylene welding, a welding torch is used to weld metals. Welding metal results when two pieces are heated to a temperature that produces a shared pool of molten metal. The molten pool is generally supplied with additional metal from a filler called welding rods.
The Cube is cast in a number of sections, all of which must be welded together. In this case, the bottom section, that is the base, is being welded to the main tower.