Final answer:
Low-hydrogen electrodes must be stored below 120 °F (48.8 °C) to prevent moisture absorption and potential safety hazards. The storage temperature minimizes the risk of hydrogen-induced cracking in welds and ensures pressure within containers remains safe.
Step-by-step explanation:
Low-hydrogen electrodes must be stored at a temperature below 120 °F (48.8 °C) to prevent moisture from being absorbed by the electrodes. Moisture absorption can lead to hydrogen induced cracking or porosity in the welded metal. These electrodes are on the can with a warning that states, "Store only at temperatures below 120 °F (48.8 °C). Do not incinerate." This is important as maintaining the storage temperature prevents the decomposition of the electrode coating and the potential risk of increase in pressure that could lead to hazardous situations.
For example, if a can containing hydrogen gas is initially at 24 °C and 360 kPa and is left in a car that reaches 50 °C on a hot day, the gas can expand and the pressure within the can increase, which could be dangerous. The warning against incineration is in place because extreme heat can cause a rapid increase in pressure, potentially leading to an explosion.
The storage and handling of hydrogen gas are crucial for safety and the efficacy of the electrodes in welding applications. Proper protocol ensures that energy storage-like a chemical battery remains safe and efficient whether used for welding or fuel cells in hydrogen-powered vehicles.