CEMP-E
TI 809-26
1 March 2000
Table 3-2. Suggested Minimum Preheat and Interpass Temperatures for AISC-
Table
Approved Structural Steels Not Prequalified under AWS D1.1.
(Seek advice of competent welding consultant prior to use of this Table.)
Catego
Structural Steel
Minimum Preheat and Interpass
ry
Temperature
Shapes and Plates
A529, grade 46
A283 (plates)
NPQ-A
same as Table 3-1, Category A
Round and Rectangular
Sections
A500, grade C (round)
Shapes and Plates
A242, all grades
A529, grades 50 and 55
A588, over 4" thick
Round and Rectangular
NPQ-B
same as Table 3-1, Category B
Sections
A500, grade C (rectangular)
A618, grades Ib, II, and III
(round)
A847
c. Preheat for Non-prequalified Applications. Preheat requirements for non-prequalified steels and
applications may be determined using rational engineering judgement considering material composition,
restraint, hydrogen levels, and experience. Table 3-2 provides suggested values for common structural
steels not currently listed in AWS D1.1. Other steels should be evaluated by a competent welding
consultant. The use of AWS D1.1 Annex XI is suggested, with suitable qualification testing to be
performed to verify the analytical results.
d. Preheat for Sheet Steel to Structural Steel. When the structural steel element is of a grade or
thickness requiring preheat under the provisions of AWS D1.1, preheat must be provided to the structural
steel element. The sheet steel itself need not be preheated.
3-5
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