Which statement best describes the role of deoxidizers like silicon and manganese in ER70S-2?

Which statement best describes the role of deoxidizers like silicon and manganese in ER70S-2?

• A. They help remove oxygen from the weld area
• B. They increase shielding gas requirements
• C. They act as primary alloying elements
• D. They reduce weld penetration

Answer: (A)

Deoxidizers work by binding oxygen that would otherwise remain in the molten metal and form oxides that lead to porosity and weaker welds. In ER70S-2, silicon and manganese have a strong affinity for oxygen and rapidly form oxides (like silicon oxide and manganese oxide) as the weld pool solidifies. These oxides either become part of the slag or are small, harmless inclusions in the weld metal, which helps keep the molten metal clean and reduces gas pockets. This is why the statement about removing oxygen from the weld area is the best description of their role. Shielding gas needs are determined by the welding process and gas composition, not by the presence of these deoxidizers, and they are not intended as primary alloying elements to change the weld’s fundamental composition or to control penetration beyond influencing how clean the weld pool remains during solidification.

Deoxidizers work by binding oxygen that would otherwise remain in the molten metal and form oxides that lead to porosity and weaker welds. In ER70S-2, silicon and manganese have a strong affinity for oxygen and rapidly form oxides (like silicon oxide and manganese oxide) as the weld pool solidifies. These oxides either become part of the slag or are small, harmless inclusions in the weld metal, which helps keep the molten metal clean and reduces gas pockets. This is why the statement about removing oxygen from the weld area is the best description of their role. Shielding gas needs are determined by the welding process and gas composition, not by the presence of these deoxidizers, and they are not intended as primary alloying elements to change the weld’s fundamental composition or to control penetration beyond influencing how clean the weld pool remains during solidification.