8 - 134
BOLTS, WELDS, AND CONNECTED ELEMENTS
Table 8-36. Prequalified Welded Joints Symbols for Joint Types B C T
butt joint corner joint T-joint
L U P
limited thickness, complete-joint-penetration unlimited thickness, complete-joint-penetration partial-joint-penetration
1 2 3 4 5
square-groove single-V-groove double-V-groove single-bevel-groove double-bevel-groove
S G F
submerged arc welding SAW gas metal arc welding GMAW flux cored arc welding FCAW
BC butt or corner joint TC T- or corner joint BTC butt, T-, or corner joint
Symbols for Base Metal Thickness and Penetration
Symbols for Weld Types 6 7 8 9 10
single-U-groove double-U-groove single-J-groove double-J-groove Flare-bevel-groove
Symbols for Welding Processes if not Shielded Metal Arc welding (SMAW):
Symbols for Welding Positions F flat H horizontal V vertical OH overhead The lower case letters, e.g., a, b, c, d, etc., are used to differentiate between joints that would otherwise have the same joint designation.
Notes to Prequalified Welded Joints A B Br C E J
J2 L M Mp N
Q Q2 R
V
Not prequalified for GMAW using short circuiting transfer. Refer to AWS D1.1 Appendix A. Joints welded from one side only. Bridge applications limit the use of these joints to the horizontal position. Refer to AWS D1.1 Section 9.12.5. Back gouge root to sound metal before welding second side. Minimum effective throat (E) as shown in LRFD Specification Table J2.3; S as specified on drawings. If fillet welds are used in buildings to reinforce groove welds in corner and T-joints, they shall be equal to 1 ⁄4 T 1 , but need not exceed 3 ⁄8 -in. Groove welds in corner and T-joints in bridges shall be reinforced with fillet welds equal to 1 ⁄4 T 1 , but not more than 3 ⁄8 -in. If fillet welds are used in buildings to reinforce groove welds in corner and T-joints, they shall be equal to 1 ⁄4 T 1 , but not more than 3 ⁄8 -in. Butt and T-joints are not prequalified for bridges. Double-groove welds may have grooves of unequal depth, but the depth of the shallower groove shall be not less than one-fourth of the thickness of the thinner part joined. Double-groove welds may have grooves of unequal depth, provided they conform to the limitations of Note E. Also, the effective throat (E), less any reduction, applies individually to each groove. The orientation of the two members in the joints may vary from 135° to 180°, provided the basic joint configuration (groove angle, root face, root opening) remains the same and the design throat thickness is maintained. For corner and T-joints, the member orientation may be changed provided the groove dimensions are maintained as specified. The member orientation may be changed provided the groove dimensions are maintained as specified. The orientation of two members in the joint may vary from 45° to 135° for corner joints and from 45° to 90° for T-joints, provided the basic joint configuration (groove angle, root face, root opening) remains the same and the design throat thickness is maintained. For corner joints, the ouside groove preparation may be in either or both members, provided the basic groove configuration is not changed and adequate edge distance is maintained to support the welding operations without excessive edge melting.
AMERICAN INSTITUTE OF STEEL CONSTRUCTION