J-Joints
•Single –J- butt welds are when one piece of the weld is
in the shape of a “J” that easily accepts filler material and
the other piece is square. A J-groove is formed either
with special cutting machinery or by grinding the joint
edge into the form of a J. Although a J-groove is more
difficult and costly to prepare than a V-groove, a single J-
groove on metal between a half an inch and three
quarters of an inch thick provides a stronger weld that
requires less filler material. Double-J-butt welds have
one piece that has a “J” shape from both directions and
the other piece is square.
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