May I suggest you put your concerns in an email to the Engineer. It is then a searchable record, even if he/she deletes it. If you are overridden, keep good notes on who, what, when and where. I use Steno notebooks that I keep for years.
jv9,
Just for clarification, I am referencing the 2010 edition of D1.1, so...
Paragraph 1.2 states that ".... The code may be suitable to govern structural fabrications outside the scope of the intended purpose. However, the Engineer should evaluate such suitability, and based upon such evaluations, ..." So, if he decides to use D1.1 he will be responsible for that decision. In your specific case, the material thickness falls outside of the limitations of D1.1, but because of 1.2, the Engineer can accept responsibility for that and call out D1.1.
Paragraph 4.2.2.1 states "Previous performance qualification test of welders, welding operators, and tack welders that are properly documented are acceptable with approval of the Engineer. The acceptability of performance qualification to other standards is the Engineer's responsibility, ..." Even if the project called for D1.3, the Engineer could accepted performance qualifications that were done to D1.1 or ASME for that matter.
If he wants to justify his actions with using a few outs from the code, I can't say that he is wrong, but then he is responsible for those decisions. I think you took the correct course of action by voicing your well founded and reasonable concerns. As far as visual inspection goes, you can sign off the welds with confidence, because that's all you are doing is the visual inspection. As long as they meet the requirements of D1.1, or whatever else the Engineer decides, you can have confidence you did your job right. If the parts fail in the near or far future, that's on the Engineer's back because he may not have choose the best available option.
I agree with you concerns, but ultimately, if the Engineer decides to proceed with what you have described that's his decision and he is responsible for it.
I forgot to mention that I am referring to the Engineer, as defined by D1.1 in 1.3.1. If this person is just a welding engineer, then none of what I just wrote really matters because he doesn't have that authority, in the code.
I hope this helps and didn't muddy the waters anymore than it may already be.
OK, so let's do a reality check here...
We're talking welder performance quals here, not welding procedure quals.
Welder qual tests for D1.1 are much more complex than D1.3.
Most entry level Welders with little to no experience can pass D1.3 tests, not the same with D1.1 tests.
In reality, a Welder qualified to D1.1 should be able to weld to D1.3, provided a proper WPS is in place.
I would not say the same for a Welder qualified to D1.3, welding on D1.1 work.
As an Engineer who knows the job and Customer requirements, I would have no problem accepting D1.1 certs for Welders doing D1.3 work, if I knew it would not be a sticky issue.
As an Inspector, yes you need to check for valid certs, and if the Engineer has approved this, which is allowed by the code, that's all that's needed. There is no integrity issue involved.
There will be times when your integrity will be put to the test. Save your indignation for then.
Tim