05.07.2009
An arc welding process that fuses together the parts to be welded by heating them with one or more electric arcs between one or more bare electrodes and the work piece. The submerged arc welding process utilizes the heat of an arc between a continuously fed electrode and the work. The heat of the arc melts the surface of the base metal and the end of the electrode. The metal melted off the electrode is transferred through the arc to the workpiece, where it becomes the deposited weld metal.
Altering the form of a substance from solid to gaseous. The process through which ice goes directly into a vapor without passing through the liquid state.
or,
A frozen substance sublimates when it passes directly into the gas phase without first becoming liquid
A tectonic process that occurs at the boundary of two converging plates, whereby oceanic crust slides below continental crust into the mantle and causes melting that results in a zone of volcanism along that boundary
An oil and gas development project is sub-commercial if the degree of commitment is not such that the accumulation is expected to be developed and placed on production within a reasonable time frame which is usually limited to around 5 years