Why is proper storage critical for filler metals?

Proper storage of filler metals is essential primarily to prevent contamination and maintain the quality of the filler material. Filler metals can be susceptible to various contaminants such as moisture, dirt, and chemicals if not stored correctly. These contaminants can adversely affect the welding process, leading to poor quality welds characterized by issues like porosity, insufficient penetration, or weak joint strength.

Maintaining the integrity of the filler metal ensures that it performs as intended during the welding operation, ultimately contributing to strong and durable welds. This focus on cleanliness and quality control is a fundamental aspect of welding best practices, as it directly influences the finished product and overall structural integrity of the welds being produced.

While the optimal temperature range for filler metals is important, it is secondary to avoiding contamination. The other options relate to factors like equipment shelf life or transportation efficiency, which, while relevant in the broader context of welding operations, do not directly address the core reason for maintaining the quality of filler metals through proper storage.