CEMP-E
TI 809-26
1 March 2000
Table 3-1. Minimum Preheat and Interpass Temperatures for AISC-Approved
Table
Structural Steels Prequalified under AWS D1.1
Minimum
Material Thickness of
Preheat and
Category
Structural Steel
Thickest Part at Point of
Interpass
Welding
Temperature
Shapes and Plates
3 to 19 mm (incl.)
0oC (32oF)1
A36
(1/8 to 3/4 in.)
A529, grade 42
A
A709, grade 36
over 19 to 38.1 mm (incl.)
66oC (150oF)
(3/4 to 1-1/2 in.)
When using
Round and Rectangular
SMAW with
Sections
over 38.1 to 63.5 mm
107oC
other than low-
A53, grade B (round)
(incl.)
(225oF)
A500, grades A and B
(1-1/2 to 2-1/2 in.)
electrodes
(round)
A500, grades A and B
over 63.5 mm
150oC
(rectangular)
(2-1/2 in.)
(300oF)
A501 (round)
Shapes and Plates
A36
A529, grade 42
A709, grades 36, 50 & 50W
A572, grades 42 and
50
3 to 19 mm (incl.)
0oC (32oF)1
A588, 100 mm (4 in.) thick
(1/8 to 3/4 in.)
B
and
under
A913, grade 50
over 19 to 38.1 mm (incl.)
10oC (50oF)
When using
A992, grade 50 (shapes
(3/4 to 1-1/2 in.)
SMAW with
only)
low-hydrogen
over 38.1 to 63.5 mm
66oC (150oF)
electrodes, or
Round and Rectangular
(incl.)
FCAW, GMAW or
Sections
(1-1/2 to 2-1/2 in.)
SAW
A53, grade B (round)
107oC
A500, grades A and B
over 63.5 mm
(225oF)
(round)
(2-1/2 in.)
A500, grades A and B
(rectangular)
A501 (round)
A618, grades lb, II, & III
(round)
3-3
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