Which statement about E71T-1H8 classification is true?

Which statement about E71T-1H8 classification is true?

• A. It specifies hydrogen content of 8 mL per 100 g weld metal
• B. It specifies no hydrogen content
• C. It indicates carbon content is high
• D. It indicates low phosphorus content

Answer: (A)

Understanding what the H8 part means is the key. The H-number in this electrode classification sets the maximum diffusible hydrogen allowed in the weld metal. An H8 designation means up to 8 milliliters of hydrogen per 100 grams of weld metal may be present. This limit is important because higher hydrogen levels can cause cracking in certain steels, so the electrode is specified to keep hydrogen within that safe range during welding. Therefore, the statement that the hydrogen content is specified as 8 mL per 100 g weld metal is the correct interpretation. The designation doesn’t indicate zero hydrogen, nor does it convey carbon or phosphorus content—those are not described by the H-number.

Understanding what the H8 part means is the key. The H-number in this electrode classification sets the maximum diffusible hydrogen allowed in the weld metal. An H8 designation means up to 8 milliliters of hydrogen per 100 grams of weld metal may be present. This limit is important because higher hydrogen levels can cause cracking in certain steels, so the electrode is specified to keep hydrogen within that safe range during welding. Therefore, the statement that the hydrogen content is specified as 8 mL per 100 g weld metal is the correct interpretation. The designation doesn’t indicate zero hydrogen, nor does it convey carbon or phosphorus content—those are not described by the H-number.