Quartz tank member and method of production thereof

Glass manufacturing – Processes – Fusion bonding of glass to a formed part


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65 54, 65 61, 65104, 65106, 65DIG8, 220416, 220678, C03B 23023




A quartz tank member produced by a new method of production having continuous inner corner surfaces formed through bending and welding processes with welded seams being smooth without any hills, valleys, pits, crevasses, or irregularities therein. The method of production of the quartz tank member involves the steps of 1) heating a quartz plate along a predetermined area to create a bent corner; 2) annealing to remove stresses created in the heating step; 3) repeating the steps of applying heat, bending and annealing to create a plurality of bent corners; 4) welding of abutting corner edges at the bent corners through use of quartz welding rods and a quartz torch assembly forming welded beads; 5) grinding of the unique welded beads on interior and exterior surfaces; 6) fire polishing the quartz tank member to remove oxidation residue created during the welding process step; 7) annealing the quartz tank member after the fire polishing process step to remove stresses; and 8) inspecting the quartz tank member, particularly in the quartz rod welded areas to assure that no hills, valleys, pits, cracks, or irregularities are contained therein.

patent: 2389601 (1945-11-01), DeWitt
patent: 4142881 (1979-03-01), Louis
patent: 5054210 (1991-10-01), Schumacher


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