NASA NTRS · 19880000450
Starting VPPA Welds Without Pilot Holes
Abstract
Welding current turned on gradually. Current increased gradually over short distance until full operating current reached, and welding proceeds in "keyhole" mode. Tests in laboratory and in production show gradual-turn-on technique 100 percent reliable.
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Mcgee, W. F.. 1988-09-01. Starting VPPA Welds Without Pilot Holes. https://ntrs.nasa.gov/citations/19880000450
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