When auxiliary storage ovens are approved by the contractor's engineer, what humidity and temperature are considered adequate to store the electrodes?

• A. 70% humidity at 25 C
• B. 90% humidity at 30 C
• C. 50% humidity at 10 C
• D. 30% humidity at 60 C

Answer: (B)

The key idea is controlling electrode moisture content through storage conditions. When an auxiliary storage oven is approved by the contractor’s engineer, the humidity and temperature inside that oven become the reference for keeping electrodes within their allowable moisture level. The 90% relative humidity at 30°C setting represents a controlled, moderately warm and highly humid environment that the engineer can specify to maintain the electrode coating’s moisture balance, preventing unwanted moisture loss or uptake that could affect weld hydrogen content and quality. Other options would either be too dry or not aligned with the approved environment, potentially compromising the electrode performance. So the approved condition is 90% humidity at 30°C.