AWS D1.1 Welding Spec

Somewhere within the 563 pages it says this -

The code was specifically developed for welded steel
structures that utilize carbon or low alloy steels that are
1/8 in [3 mm] or thicker with a minimum specified yield
strength of 100 ksi [690 MPa] or less. The code may be
suitable to govern structural fabrications outside the
scope of the intended purpose. However, the Engineer
should evaluate such suitability, and based upon such
evaluations, incorporate into contract documents any
necessary changes to code requirements to address the
specific requirements of the application that is outside
the scope of the code. The Structural Welding Committee
encourages the Engineer to consider the applicability
of other AWS DI codes for applications involving aluminum
(AWS D1.2), sheet steel equal to or less than
3/16 in thick [5 mm] (AWS D1.3), reinforcing steel
(AWS D1.4), and stainless steel (AWS D1.6). The
AASHTOIAWS D1.5 Bridge Welding Code was specifically
developed for welding highway bridge components
and is recommended for those applications.

Thk, for your info.