![]() ![]() This method of welding, known as Three O’Clock welding (3-O’Clock), delivers good clean and smooth penetration and provides a more uniform weld. However, the use of preheat in the winter time has made this a very successful way of the welding the girth (round) seams connecting one shell course to the next. Many tank builders abandoned this method of welding on bottoms due to the inability to control moisture from the bottom side of the lap plates. The first use of this process took many years of education to develop a method of welding that would be clean of porosity under the surface of the weld. This process was used on lap welded bottoms and roofs and butt welded shell joints. ![]() Submerged Arc Welding (SAW) became popular in the tank industry in the early 1980s.
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