A surgical stapling anvil for use with a surgical instrument, wherein said surgical stapling anvil comprises: an anvil body, comprising: a tissue-facing surface comprising a plurality of staple-forming pockets defined therein; and a longitudinal cavity defined therein, wherein said longitudinal cavity comprises: a first cavity portion comprising a first width, wherein said first cavity portion is configured to receive at least a portion of a cutting edge of a firing member of the surgical instrument therethrough; and a second cavity portion comprising a second width which is greater than said first width, wherein said second cavity portion is configured to receive an anvil-engaging portion of the firing member therethrough; and an anvil cap; and characterized in that: said longitudinal cavity further comprises: a third cavity portion comprising a third width which is greater than said second width, wherein said third cavity portion further comprises a first angular surface which flares outward relative to said second cavity portion; and said anvil cap comprises: a first section positioned within a portion of said second cavity portion; and a second section positioned within said third cavity portion, wherein said second section comprises a second angular surface corresponding to said first angular surface, and wherein a mated portion of said first angular surface and said second angular surface define a mated depth; and further characterized in that said surgical stapling anvil further comprises: a weld welding said first angular surface and said second angular surface together, wherein said weld comprises a weld depth which is substantially equal to said mated depth, wherein said weld depth is between 0.38mm (0.015 inches) and about 1.02mm (0.040 inches). an anvil body, comprising: a tissue-facing surface comprising a plurality of staple-forming pockets defined therein; and a longitudinal cavity defined therein, wherein said longitudinal cavity comprises: a first cavity portion comprising a first width, wherein said first cavity portion is configured to receive at least a portion of a cutting edge of a firing member of the surgical instrument therethrough; and a second cavity portion comprising a second width which is greater than said first width, wherein said second cavity portion is configured to receive an anvil-engaging portion of the firing member therethrough; and a tissue-facing surface comprising a plurality of staple-forming pockets defined therein; and a longitudinal cavity defined therein, wherein said longitudinal cavity comprises: a first cavity portion comprising a first width, wherein said first cavity portion is configured to receive at least a portion of a cutting edge of a firing member of the surgical instrument therethrough; and a second cavity portion comprising a second width which is greater than said first width, wherein said second cavity portion is configured to receive an anvil-engaging portion of the firing member therethrough; and a first cavity portion comprising a first width, wherein said first cavity portion is configured to receive at least a portion of a cutting edge of a firing member of the surgical instrument therethrough; and a second cavity portion comprising a second width which is greater than said first width, wherein said second cavity portion is configured to receive an anvil-engaging portion of the firing member therethrough; and an anvil cap; and characterized in that: said longitudinal cavity further comprises: a third cavity portion comprising a third width which is greater than said second width, wherein said third cavity portion further comprises a first angular surface which flares outward relative to said second cavity portion; and said anvil cap comprises: a first section positioned within a portion of said second cavity portion; and a second section positioned within said third cavity portion, wherein said second section comprises a second angular surface corresponding to said first angular surface, and wherein a mated portion of said first angular surface and said second angular surface define a mated depth; and further characterized in that said surgical stapling anvil further comprises: a first section positioned within a portion of said second cavity portion; and a second section positioned within said third cavity portion, wherein said second section comprises a second angular surface corresponding to said first angular surface, and wherein a mated portion of said first angular surface and said second angular surface define a mated depth; and further characterized in that said surgical stapling anvil further comprises: a weld welding said first angular surface and said second angular surface together, wherein said weld comprises a weld depth which is substantially equal to said mated depth, wherein said weld depth is between 0.38mm (0.015 inches) and about 1.02mm (0.040 inches).