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Also in 1949, the first independent sales and service center opened in the United States. The sales and service network expanded to Europe in 1969 and to Asia in 1972. Today, sales and service centers are located in 70 countries, providing customers with local inventory, services, and support.
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A submerged arc welder used for training Close-up view of the control panel A schematic of submerged arc welding Pieces of slag from submerged arc welding exhibiting glassy surface due to silica (SiO 2). Submerged arc welding (SAW) is a common arc welding process. The first SAW patent was taken out in 1935.
Arc welding power supplies can deliver either direct (DC) or alternating (AC) current to the work, while consumable or non-consumable electrodes are used. The welding area is usually protected by some type of shielding gas (e.g. an inert gas), vapor, or slag. Arc welding processes may be manual, semi-automatic, or fully automated.
In building construction today some lead flashing is welded but soldered copper flashing is much more common in America. In the automotive body repair industry before the 1980s, oxyacetylene gas torch welding was seldom used to weld sheet metal, since warping was a byproduct as well as excess heat.
The MotorBook, as the catalog was originally called, was the basis for today's Grainger catalog. Grainger headquarters are now located in Lake Forest, Illinois. By 1936, Grainger had established 15 branches to improve customer service. The company was passed down to David William Grainger, the son of W.W. Grainger.