A 200,000-volt X-ray machine photographing the circumferential welded seams of a main unit penstock section. One picture covers 16 inches of the seam; the penstock liner is rotated so that successive 16-inch sections of the seam are X-rayed. The film is exposed to X-rays which have first passed through the welded seam, and any slag, gas, or lack of fusion that is present in the weld is revealed by the photograph.
Description
A 200,000-volt X-ray machine photographing the circumferential welded seams of a main unit penstock section. One picture covers 16 inches of the seam; the penstock liner is rotated so that successive 16-inch sections of the seam are X-rayed. The film is exposed to X-rays which have first passed through the welded seam, and any slag, gas, or lack of fusion that is present in the weld is revealed by the photograph.
Notes
Part of Western Waters Digital Library: http://harvester.lib.utah.edu/wwdl/; Messrs. Johnson and Erickson selected photographs from photographers Pomeroy, Robinson, and Russell.