Page 92 - Structural Steel Designers Handbook AISC, AASHTO, AISI, ASTM, and ASCE-07 Design Standards

Brockenbrough_Ch03.qxd 9/29/05 5:05 PM Page 3.24

CONNECTIONS

3.24 CHAPTER THREE

FIGURE 3.17 Groove welds.

thickness, and the depth of the weld may be less than the joint thickness (Fig. 3.18). However, even
if the edges are fully shaped, groove welds made from one side without a backing bar or made from
both sides without back gouging are considered partial-joint-penetration welds. They are often used
for splices in building columns carrying axial loads only.
Plug welds and slot welds are used to transmit shear in lap joints and to prevent buckling of
lapped parts. In buildings, they also may be used to join components of built-up members. (Plug or
slot welds, however, are not permitted on A514 steel.) The welds are made, with lapped parts in con-
tact, by depositing weld metal in circular or slotted holes in one part. The openings may be partly or
completely filled, depending on their depth. Load capacity of a plug or slot completely welded
equals the product of hole area and allowable stress. Unless appearance is a main consideration, a
fillet weld in holes or slots is preferable.

FIGURE 3.18 Penetration information given on the welding symbol in (a) for the
5
weld shown in (b). Penetration must be at least / 8 in.

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