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

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