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Reactive Tile Fabrication Support
Final rept. 1 Jan-30 Jul 2011
NU-WAY INDUSTRIES INC DES PLAINES IL
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These briefing charts demonstrate a method for improving dimensional stability in laser welding by using interlocking cutouts on the edges rather then internal return flanges. Forming heavy gage 17-4 stainless steel can be achieved by annealing the material to a red hot 1900 degrees F, then air cooling it down to a manageable 800 degrees F. While plates are forming, consideration must be given to bulging, tolerance capabilities, and throughput. The forming fixture required weld gussets for support. The plates had to be formed with a sub-plate to reduce stress and fracturing. Other issues to consider are inconsistent angles and variations in material thickness, which will affect bending and metal fatigue. The solution for the first six samples was to match each component of the tile by welding on strips to build up the material to match the rails where the thickness variation resulted in gaps. The flat 17-4 tile plates were welded to .030 14 hard stainless steel with formed rails between for internal casing. The mating of the components was done using interlocking features. The method described results in laser welding at 20 inches per minute.
APPROVED FOR PUBLIC RELEASE