double-J groove weld
double-J groove weld[¦dəb·əl ′jā ‚grüv ‚weld]
A groove weld in which one member has a joint edge in the form of a double J or two half U's, one from each side. Also known as double-U groove weld.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.