What type of welding rods should be used on corner fittings to prevent hydrogen embrittlement?

Using low-hydrogen welding rods or wire is essential when welding corner fittings to prevent hydrogen embrittlement. This phenomenon can occur during the welding process when hydrogen, which may be present in moisture or contaminants, diffuses into the weld metal. If high levels of hydrogen accumulate, it can lead to premature fractures or cracks in the weld.

Low-hydrogen welding rods are specifically designed to minimize the introduction of hydrogen into the weld pool. They have coatings that limit the moisture content and thus reduce the risk of hydrogen being absorbed during the welding process. By using these rods, welders can maintain the integrity and strength of the corner fittings, which are critical for the structural stability of containers.

The other options do not emphasize the importance of mitigating hydrogen risks effectively. High-tensile welding rods may have strength characteristics but do not necessarily address hydrogen control. Standard MIG welding wire does not offer the same low-hydrogen properties, making it less suitable for preventing embrittlement risks. Similarly, arc welding rods may vary in their hydrogen content management and are not specifically formulated to prevent hydrogen embrittlement like low-hydrogen rods are.