When added to ER70S-2, silicon, aluminum and manganese are used as:

When added to ER70S-2, silicon, aluminum and manganese are used as:

• A. stabilizers.
• B. deoxidizers.
• C. lubricators.
• D. indicators.

Answer: (B)

Silicon, aluminum, and manganese are added to ER70S-2 to act as deoxidizers. When the weld pool melts, it can pick up oxygen from the surrounding metal, creating oxides that cause porosity and weak spots. These elements react with that oxygen to form stable oxides (like SiO2, Al2O3, MnO), tying up the oxygen and reducing porosity. This improves weld quality, ductility, and overall integrity. They may also influence slag behavior and arc characteristics, but their primary role in ER70S-2 is deoxidation, not lubrication, indication, or stabilization.

Silicon, aluminum, and manganese are added to ER70S-2 to act as deoxidizers. When the weld pool melts, it can pick up oxygen from the surrounding metal, creating oxides that cause porosity and weak spots. These elements react with that oxygen to form stable oxides (like SiO2, Al2O3, MnO), tying up the oxygen and reducing porosity. This improves weld quality, ductility, and overall integrity. They may also influence slag behavior and arc characteristics, but their primary role in ER70S-2 is deoxidation, not lubrication, indication, or stabilization.