Dear Sir,
According to QW-151.2(d),
when multiple specimens are necessary, the entire thickness shall be mechanically cut into a minimum number of approximately equal strip of a size that can be tested in the available equipment.
So in your case Pipe thickness is 40 mm so size of multiple specimen shall be 20 mm (Top) and 20 mm (bottom)
Regards,
Navnitkumar Parikh
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Dear Mr. Keskar,
As per code requirements ideally we should test the full thickness specimen for tensile test. But due to the limitations of Universal Testing Machine code has given permission for testing multiple samples and it should represent the same cross section of thickness. Code allows the lesser thickness after addition
Of multiple specimen thicknesses. As per your mail if sample thickness is 25 mm for both samples then these samples are machined side by side and not from one location. So in my opinion these samples are not meeting the code requirements.
Pls. Refer QW 151.2 C "All of the specimen required to represent the full thickness of weld at one location shall comprise a set".
Regards,
Nilesh Pathare.