WELDED CONSTRUCTION
8 - 145
Table 8-36 (cont.). Prequalified Welded Joints Complete-Joint-Penetration Groove Welds Tolerances
Single-U-groove weld (6) Butt joint (B) Corner joint (C)
Welding Process
Joint Designation
SMAW
B-U6
GMAW FCAW
Base Metal Thickness (U = unlimited)
As Detailed
As Fit Up
R = +1 ⁄16, − 0
+ 1 ⁄16 , − 1⁄8
α = +10°°, − 0°°
+10°°, − 5°°
f = ± 1 ⁄16
Not limited
r = +1 ⁄8 , − 0
+1 ⁄8 , − 0
Groove Preparation Gas Shielding for FCAW
Notes C, N
T1
T2
Root Opening
Groove Angle
Root Face
Groove Radius
Permitted Welding Positions
U
U
R = 0 to 1 ⁄8
α = 45°°
f = 1 ⁄8
r = 1 ⁄4
All
—
R = 0 to 1 ⁄8
α = 20°°
f = 1 ⁄8
r = 1 ⁄4
F, OH
—
C, N
R = 0 to 1 ⁄8
α = 45°°
f = 1 ⁄8
r = 1 ⁄4
All
—
C, J, R
C-U6
U
U
R = 0 to 1 ⁄8
α = 20°°
f = 1 ⁄8
r = 1 ⁄4
F, OH
—
C, J, R
B-U6-GF
U
U
R = 0 to 1 ⁄8
α = 20°°
f = 1 ⁄8
r = 1 ⁄4
All
Not req.
A, C, N
C-U6-GF
U
U
R = 0 to 1 ⁄8
α = 20°°
f = 1 ⁄8
r = 1 ⁄4
All
Not req.
A, C, J, R
Double-U-groove weld (7) Butt joint (B)
Welding Process
Joint Designation
SMAW
Base Metal Thickness (U = unlimited) T1
T2
B-U7
U
—
GMAW FCAW
B-U7-GF
U
—
SAW
B-U7-S
U
—
Tolerances
Tolerances
For B-U7 and B-U7-GF
For B-U7-S
As Detailed
As Fit Up
R = +1 ⁄16, − 0
+ 1 ⁄16 , − 1⁄8
R = ±0
+ 1 ⁄16 , − 0
+10°°, − 5°°
α = +0°°, − 1 ⁄4 °
± 1 ⁄16
f = ± 1 ⁄16 , − 0
Not limited
r = +1 ⁄4 , − 0
± 1 ⁄16
Gas Permitted Shielding Groove Welding for Radius Positions FCAW
Groove Angle
Root Face
R = 0 to 1 ⁄8 α = 45°°
f = 1 ⁄8
r = 1 ⁄4
All
R = 0 to 1 ⁄8 α = 20°°
f = 1 ⁄8
r = 1 ⁄4
R = 0 to 1 ⁄8 α = 20°°
f = 1 ⁄8
r = 1 ⁄4 r = 1 ⁄4
R=0
As Fit Up
α = +10°°, − 0°°
Groove Preparation Root Opening
As Detailed
α = 20°° f = 1 ⁄4 max
AMERICAN INSTITUTE OF STEEL CONSTRUCTION
Notes
—
C, M, N
F, OH
—
C, M, N
All
Not required
A, C, M, N
F
—
C, M, N