I mean for one project, it may have main structure and secondary structure. Main struture carries forces and contains most of the important weld. It is neccessary to prepair PQR for that.
But for secondary structures, which only connect two parts, did not transfer any force. So do we need PQR for that also?
Vee don't need no stinking bahdges! (El Bandido to Humphrey Bogart In the treasure of Sierra Madre)
Does your car drive OK without a license?
In Response to Joseph P. Kane
I really think it was, "Badges? We don't need no badges! We don't have to show you no stinking badges!" And the bandit is named "Goldhat" in the credits, not El Bandido. Great movie and one of my favorites.
Be sure to read the project specifications from the Engineer for the applicable code.
Whether it is main or secondary the applicable standard should be specified. If it is AWS D1.1 then most instances you can get away with Pre-qualified Weld Procedure Specification (WPS) and if you have need to qualify, because the variables fall out side that allowed by the code, then a PQR would be required.
All welding if the AWS and other codes are specified, shall be welded using a WPS, whether pre-qualified or qualified. Be real careful and look on the general notes of the drawings also, all they need do is reference the standards to as being applicable.
The same goes for the welder qualification issues involved also.
By 803056 
Date 12-12-2010 00:31
Edited 12-12-2010 15:48
I could be wrong (again), but do you mean a WPS?
A procedure qualification record (PQR) is required when you qualify a welding procedure specification by testing it. That is, you weld a sample using the parameters of the proposed WPS and then subject the sample to nondestructive and destructive tests. If the sample passes all the required tests, the WPS is qualified.
Once a WPS is qualified, it can be used for a range of base metals and different joint details. The nature of the applied loads do not usually determine whether the WPS is applicable unless notch toughness is a requirement. When notch toughness is required, the range of base metals that can be welded with that WPS is typically limited.
Best regards - Al
