slot weld[′slät ‚weld]
Similar to plug weld, but the hole is elongated and may extend to the edge of a member without closing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
A weld between two members, one containing an elongated hole through which the other member is exposed; the hole is completely or partially filled with weld metal, thereby joining the two members; one end of the hole may be open.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.