Hi Norberto!

First and foremost, I would like to personally "WELDCOME" you to the "World's Greatest Welding Forum!!!" and as they say in Rio: "Ola!"
Also, thank you for your kind words but, there are many more in here with equal to much greater proficiency in AWS D1.1 than myself and that is why I am humbled by your comments. ;)

Anywho, back to the matter at hand... Provided that there are no changes in Essential Variables Requiring WPS Requalification for in your case, SMAW as shown and listed in table 4.5, starting on page 134, and continuing through to page 136. Also, provided that there are no changes in Table 4.11 titled "Welding Personnel Performance Essential variable Changes Requiring Requalification (See 4.22)," then the only issue left would be to which position(s) you would choose to qualify the welder in... For instance, if you want to qualify the welder to all positions then both a 3G & 4G test is required.

Are you sure you are qualifying a WPQR, or a WPS instead? Anywho, I am going to presume that you are qualifying a "Welding Procedure Specification" as opposed to a "Welding Procedure Qualification Record" since as Professor Crisi sometimes states: "English is not my mother language." ;) ;) ;)

The appropriate Test Plates for thicknesses over 3/8 of an inch, or over 9.525 mm (I know in the book it say 10 mm but, that is a rounded to the nearest millimeter dimension) shall be found in Figure 4.10 "Location of Test Specimens on Welded Test Plate Over 3/8 in. [10 mm] Thick - WPS Qualification (4.8)" and can be located on page 155.

If there is any confusion as to why only a butt joint is require as opposed to a "T" joint like shown in your illustration, just read the first General note in Figure 4.10:
" The groove configuration shown  is for illustration only. The groove shaped tested shall conform to the production groove shape that is being qualified." In other words, a single bevel on one member of the test plate as in the case of a TC-U5b which is shown in your illustration.

And to confirm this, all one has to do is to back -track to 4.9.1.1 "Corner or T-joints" Where it states; Test specimens  for groove welds in corner or T-joints shall be butt joints having the same groove configuration as the corner or T-joint to be used on construction, except the depth need not exceed 1 in. [25 mm]. So, a single bevel butt joint (45 degree angle on one member only) with backing should do the trick as long as all of the detailed dimensions of TC-U5b are also met and are within the allowable tolerances.

Note: [25 mm] is actually 25.4 mm but, the dimension used is rounded off to the nearest millimeter which in my opinion isn't really that critical in the context of the conversion shown... However, when practicing the conversion from US standard units to the Metric, or IS metric system (There is a slight difference in some values between the two metric systems) the entire purpose for the conversion to using metric dimensioning practices is to result in having more accurate as well as precise dimensions in the case of linear measurement as well as other types of measurement... So, I don't personally agree to rounding off metric dimensions to the nearest millimeter especially when precision is built in to the design. In the case of AWS D1.1 2002, this is not required as the tolerances being applied in all circumstances are large enough to allow the rounding off to the nearest millimeter.

Now to answer the question as to what are the types of test specimens required... Unless the EOR has specified something extra such as CVN testing, then have a look at Table 4.2 on page 132. You will see that for 25 mm and over,  2 Reduced Section Tension specimens and 4 side bends are required for tests on plate. Also, do not forget to read the notes 1 & 2 in table 4.2. I hope this will clarify your previous queries Norberto! ;) :) :)

Respectfully,
Henry