(Blank)
One backing material used in groove welding is
an inert gas
Single-groove welds with metal backing are used for
high-strength ,high-quality welds
When preparing weld coupons for V-groove welds with backing, cut the metal backing strips so that they are at least
1" * 8" ( 6 mm X 2.5 cm X 20.3cm )
To conform with AWS limited-thickness test coupon reequipments, weld coupons should be carbon steel that is
3/8" thick