The -1 suffix in E71T-1 indicates chemical composition; which encoding represents low-alloy steel?

The -1 suffix in E71T-1 indicates chemical composition; which encoding represents low-alloy steel?

• A. Letter and number
• B. Number
• C. Symbol
• D. Code

Answer: (A)

The key idea is how welding filler metal designations convey information about the weld metal chemistry. The -1 suffix in a designation like E71T-1 signals that the part being described is the weld-metal chemistry, not just the strength or process details. In this system, the chemical composition is encoded with a mix of letters and numbers, which is how low-alloy steels are identified. If the encoding were purely numeric, it would only convey a strength rating and wouldn’t specify the alloying elements present. A simple symbol or generic code wouldn’t reliably indicate the chemistry under the AWS conventions. So the chemistry portion is represented by a letter-and-number code, which is why low-alloy steel is encoded that way.

The key idea is how welding filler metal designations convey information about the weld metal chemistry. The -1 suffix in a designation like E71T-1 signals that the part being described is the weld-metal chemistry, not just the strength or process details. In this system, the chemical composition is encoded with a mix of letters and numbers, which is how low-alloy steels are identified. If the encoding were purely numeric, it would only convey a strength rating and wouldn’t specify the alloying elements present. A simple symbol or generic code wouldn’t reliably indicate the chemistry under the AWS conventions. So the chemistry portion is represented by a letter-and-number code, which is why low-alloy steel is encoded that way.