When using a permanent backing ring, insert the ring inside one of the coupons and make an allowance for
the root opening, which can be up to _____.
a. 1/4 (6.4 mm)
b. 3/16 (4.8 mm)
c. 1/8 (3.2 mm)
d. 3/32 (2.4 mm)
Question 2
When preparing aluminum pipe coupons, use an approved solvent and a clean rag to remove any grease or
oil within a minimum of _____.
a. 1-1/2 from the weld joint
b. 1 from the weld joint
c. 3/4 from the weld joint
d. 1/2 from the weld joint