What is the consequence of exceeding exposure time for weld rods?

Exceeding the exposure time for weld rods primarily leads to decreased strength in the weld. Welding electrodes and rods are designed to be used within specific exposure parameters to maintain their effectiveness. When rods are exposed to the atmosphere for too long, they can absorb moisture and contaminants. This exposure negatively impacts the chemical composition and metallurgical properties of the rods, often resulting in hydrogen pick-up. Hydrogen presence can cause various issues, including hydrogen embrittlement and cracking in the weld. Therefore, maintaining the proper exposure time is crucial to ensure that the integrity and strength of the weld are not compromised. This understanding is essential for ensuring sound and reliable welds in steel structures as outlined in the Structural Welding Code – Steel (D1.1).