Q. What do you mean by Filler metals?
Use filler metal that is similar in chemistry, corrosion resistance, and mechanical properties of the base metal being welded.
Filler metals shall conform to ASME Section II, Part C. Permission to use filler metals manufactured to other standards must be obtained prior to use. Submit nominal chemistry and mechanical properties with the request for approval.
Welding carbon steels, and weld deposit must meet classification A-1 analysis of ASME Section IX, Table QW-442. The following requirements also apply; reference ASME Section IX, Table QW-432:
• Use F1 and F2 for non-pressure fillet welds only.
• Use F3 (E6010 and E6011) electrodes for root passes of groove welds made from one side and for fillet welds only.
• Use F4 (E7015, E7016, and E-7018) for weld-out and fillet welds.
• Do not use F4 electrodes for the root pass of groove welds made from one side.
When joining two different ferritic steels, or when joining ferritic to martensitic steels, the filler metal shall conform to the nominal chemistry of either base metal. However, for attaching non-pressure parts to pressure parts, the filler metal chemistry shall match the nominal chemistry of the pressure part.
For joining austenitic stainless steel to ferritic or martensitic steels, use Type 309. (Reminder: Nickel-base filler metals shall not be used for strength welds in hydrogen service).
For joining nickel-base alloy to ferritic or martensitic steels, use Inconel 182 (ENiCrFe-3), Inconel 82 (ERNiCr-3), or Inco-Weld A (ENiCrFe-2).
Do not use Type 310 except for welding Type 310 to Type 310.
Storage and handling of filler metals and fluxes shall be in accordance with the manufacturer's recommended practice and ASME Section II, Part C.