I see you are a welding instructor as well as a CWI. I suppose you may be qualifying welders and procedures for your school or clients. If that is the case, you need to go further than simply meeting the requirements of Section IX. Yes, you need to purchase copies or at least have access to the applicable construction codes. My advice is "Don't stop with Section IX".

Always ask the question, "What construction code is applicable?"

Remember, Section IX is not a stand alone document. The construction code can and often will modify the requirements of Section IX. For example, when impact testing is required, it is the construction code that stipulates when it is required. When working to B31.3, different piping categories impose additional requirements such as the need for qualifying the base metal based on specification, not just P-number and group number, welders have to be qualified by guided bend testing, etc.

Just because the WPS/PQR or the performance test report says the procedure or the welder is qualified to Section IX does not mean the documentation is applicable to the actual project.

I often have to reject welding documentation because the contractor or the laboratory didn't take into consideration the requirements of the applicable construction code.

Best regards - Al