Which flux type is specified for low hydrogen use with SAW?

Which flux type is specified for low hydrogen use with SAW?

• A. Pelletized flux
• B. Granulated flux
• C. Hydrated flux
• D. Agglomerated flux

Answer: (D)

In SAW, keeping hydrogen out of the weld metal is key for low-hydrogen requirements. Hydrogen often comes from moisture in the flux, so flux forms with minimal moisture release are preferred for low hydrogen welding. Hydrated flux is clearly unsuitable because it contains water that adds hydrogen. While dry forms like pelletized or granulated flux can be used, they aren’t inherently optimized for the lowest hydrogen content without strict moisture control. Agglomerated flux is designed to minimize hydrogen contribution during welding, providing lower hydrogen deposition in the weld. That’s why it’s specified for low hydrogen use with SAW.

In SAW, keeping hydrogen out of the weld metal is key for low-hydrogen requirements. Hydrogen often comes from moisture in the flux, so flux forms with minimal moisture release are preferred for low hydrogen welding. Hydrated flux is clearly unsuitable because it contains water that adds hydrogen. While dry forms like pelletized or granulated flux can be used, they aren’t inherently optimized for the lowest hydrogen content without strict moisture control. Agglomerated flux is designed to minimize hydrogen contribution during welding, providing lower hydrogen deposition in the weld. That’s why it’s specified for low hydrogen use with SAW.