NASA NTRS · 19690000389
Quick-acting backup tool for welding ducts
Abstract
Alignment and backup tool facilitates butt welding of large-diameter ducts. It consists of a circular three-place segmented hoop, a pneumatic piston, and two shoes.
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Johnson, L. L.. 1969-09-01. Quick-acting backup tool for welding ducts. https://ntrs.nasa.gov/citations/19690000389
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