Calling it sculpture because I'm not sure you can call it welding.

Don't you find it amazing that a company would allow those welds pass through their system unchallenged?

My report to the Owner/Engineer would indicate the contractor's QC system is nonfunctional. My recommendation would be that the contractor hire a third part inspection agency to perform the code mandated visual and any supplementary NDT required by the contract documents.

The Verification inspector represents the Owner by performing quality assurance function. The contractor is responsible for all quality control functions. The Verification Inspector should never be forced to serve as the contractor's quality control person. That requires the Verification Inspector into the uneasy position of serving two masters and forces the Owner to accept liability for the contractor’s work. It is better to require the contractor to hire a third party to fulfill the contractor’s responsibility so as to maintain the separation of QC and QA. The cost for the TPI QC should be borne by the contractor since QC is their responsibility.  Nothing gets the contractor’s attention like a whopping sized invoice for services rendered that he should have performed. 

Best regards - Al