What code book or manual does AWS D1.1 use for welding symbols?

The AWS D1.1 Structural Welding Code – Steel refers to the AWS A2.4 standard for welding symbols. This document provides the symbols used in welding drawings to convey information about welding processes, joint designs, and other relevant information that aids in the fabrication of welded structures. The standardized symbols help ensure consistency and clarity in communication among engineers, fabricators, and inspectors in the welding industry.

In the context of the other options, ANSI Z49.1 is a safety and health guideline for welding and cutting processes, and ISO 9606 pertains to the qualification testing of welders for specific processes, which are not directly concerned with the communication of welding operations through symbols. ASME IX primarily addresses the qualifications of welding and brazing procedures and welders but does not focus on the symbols themselves. Therefore, AWS A2.4 is the correct reference for welding symbols used in conjunction with the AWS D1.1 code.