The most common type of​ V-groove weld with steel backing produced for an AWS qualification test is limited thickness with qualification up to​ _____.
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Part 1
A.
one fourth double prime
​(6 mm)
B.
three fourths double prime
​(19 mm)
C.
one eighth double prime
​(3 mm)
D.
one half double prime
​(13 mm)