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1.6-millimeter 140 meganewtons 600-grit plus chemically 600-grit sanded as-received plus chemically chemically polished surface commercial material commercial TD-NiCr creep-rupture shear strength creep-rupture shear testing diffusion lap welds diffusion welding technique dispersion-strengthened materials ductility electropolishing eliminate the weld excessive deformation followed by postheating grain boundaries grain growth grains after recrystallization heating at 760 Holko hot press hours in hydrogen improved diffusion welding Kenneth H meganewtons per square meter 30 ksi millimeter MN/m NASA oxide parent material parent-metal strength polished surface preparation postheating at 1180 preparation and weld processed to commercial recommended weld cycles resulted in welds room temperature sanded plus chemically section of table shear failure shear stress shown in figure shown in table small grains SP and commercial SP material Space Shuttle Specially processed material specially processed TD-NiCr square meter 30 Sulfuric acid thick SP TD-NiCr ThOg unwelded areas weld quality weld tooling weldments welds in SP