In F4103, what does the digit '3' denote?

In F4103, what does the digit '3' denote?

• A. Impact strength at -30 C (27 J)
• B. Impact strength at room temperature
• C. Flux type
• D. Wire classification

Answer: (A)

The digit shows the low-temperature toughness requirement. In this F4103 designation, the trailing digit encodes the Charpy impact energy at -30 C, and a value of 3 corresponds to 27 J (about 20 ft-lb). This tells you how tough the weld metal is when tested in cold service. The other aspects like flux type or wire classification aren’t determined by this digit; those are defined elsewhere in the specification.

The digit shows the low-temperature toughness requirement. In this F4103 designation, the trailing digit encodes the Charpy impact energy at -30 C, and a value of 3 corresponds to 27 J (about 20 ft-lb). This tells you how tough the weld metal is when tested in cold service. The other aspects like flux type or wire classification aren’t determined by this digit; those are defined elsewhere in the specification.