This code covers the welding requirements for any type of welded structure made from the commonly used carbon and low-alloy constructional steels. Clauses 1 through 8 constitute a body of rules for the regulation of welding in steel construction. There are eight normative and twelve informative annexes in this code. A Commentary of the code is included with the document.

Significant changes in 2010 Edition:

• new prequalification variable tables and accompanying commentary added to clarify what variables must be listed on prequalified WPSs and what ranges they are allowed
• matching and undermatching table in the prequalification section was revised to clarify intent
• weld profile requirements were clarified and slightly revised
• shelf bar requirements were added
• thermal cut requirements were changed
• weld access hole and beam cope requirements were revised and clarified
• weathering steel requirements were expanded to include more materials
• three new materials were added to the list of prequalified materials
• issue on CVN qualification was clarified to avoid unnecessary testing
• backing requirements revised to allow discontinuous backing in limited applications
• headed stud requirements revised and clarified for burst cracks