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Rolled shell sections, 12 mm

Forty shell cans rolled to 0.5% circularity, with no post-weld correction.

Rolled shell sections, 12 mm

Forty shell cans in 12 mm plate, rolled and longitudinally welded to a circularity tolerance of 0.5% of diameter, measured cold.

The whole job turned on pre-bending the plate edges properly. Get that wrong and every can needs re-rolling after welding, which is where this kind of work usually loses money.

None needed correction.