Question

how should low hydrogen electrodes be stored before use?

in ovens held at a temperature which assures the maintenance of their low moisture content
in their original containers
either a or b
none of the above

Explanation:

Identify the characteristics of low hydrogen electrodes

Low hydrogen electrodes (such as E7018) have a special flux coating designed to minimize the amount of hydrogen introduced into the weld pool. Hydrogen absorption can lead to underbead cracking and weld embrittlement. Because their flux coatings are highly hygroscopic, they readily absorb moisture from the surrounding atmosphere.

Determine proper storage requirements

To prevent moisture absorption, low hydrogen electrodes must be kept dry.

• When first received, they are sealed in hermetically closed, airtight original containers which protect them from atmospheric moisture.
• Once the original container is opened, any unused electrodes must be stored immediately in specialized holding ovens maintained at elevated temperatures (typically between \(250^\circ\text{F}\) and \(300^\circ\text{F}\) or \(120^\circ\text{C}\) to \(150^\circ\text{C}\)) to ensure they maintain their low moisture content.

Evaluate the given options

• Option A ("In ovens held at a temperature which assures the maintenance of their low moisture content") is a correct storage method once a container is opened.
• Option B ("In their original containers") is also a correct storage method before the hermetic seal is broken.
• Option C ("Either A or B") correctly recognizes that both methods are standard, acceptable ways to store these electrodes depending on whether the original package has been opened.
• Option D ("None of the above") is incorrect.

Therefore, the most comprehensive and correct choice is Either A or B.

Answer:

• (A) In ovens held at a temperature which assures the maintenance of their low moisture content
• (B) In their original containers
• (C) Either A or B (Correct answer)
• (D) None of the above