In ER70S-2 filler metal, silicon and manganese serve as what?

In ER70S-2 filler metal, silicon and manganese serve as what?

• A. deoxidizers
• B. fluxing agents
• C. alloying elements for strength
• D. filler metals

Answer: (A)

Silicon and manganese in this filler metal act as deoxidizers. When the weld metal melts, oxygen can be present and cause porosity or brittle oxides. Silicon and manganese readily bond with that oxygen to form stable oxides (like silicon dioxide and manganese oxides), which can be incorporated into the slag or settle out, leaving a cleaner, more ductile weld. This wire is a solid filler with no flux core, so the deoxidizing elements inside the wire are what scavenge oxygen. Other roles like fluxing agents apply to flux-cored or coated electrodes, and while these elements can influence some strength, their primary purpose here is deoxidation.

Silicon and manganese in this filler metal act as deoxidizers. When the weld metal melts, oxygen can be present and cause porosity or brittle oxides. Silicon and manganese readily bond with that oxygen to form stable oxides (like silicon dioxide and manganese oxides), which can be incorporated into the slag or settle out, leaving a cleaner, more ductile weld. This wire is a solid filler with no flux core, so the deoxidizing elements inside the wire are what scavenge oxygen. Other roles like fluxing agents apply to flux-cored or coated electrodes, and while these elements can influence some strength, their primary purpose here is deoxidation.