Which pairing is typical for carbon steel welding with common methods?

• A. Carbon steel: ER70S-6 or E7018 with SMAW or GMAW.
• B. Carbon steel: ER308L with GTAW or GMAW.
• C. Carbon steel: ER4043 or ER5356 with GTAW or GMAW.
• D. Carbon steel: ER4047 with SMAW.

Answer: (A)

The main idea is that, for carbon steel welded with common methods, you pick filler metals that are designed to mesh well with carbon steel and give strong, reliable welds. For the widely used methods SMAW and GMAW, the typical pairing is ER70S-6 for GMAW (MIG) and E7018 for SMAW (stick). ER70S-6 is a versatile solid wire that welds carbon steels cleanly, with good deposition and deoxidizers to help with sound weld metal. E7018 is a low-hydrogen, flux-coated electrode that produces strong, tough welds and is a standard choice for structural carbon-steel joints. These two fillers cover the common carbon-steel welding needs across the major processes. Fillers like ER308L are for stainless steel, while ER4043, ER5356, and ER4047 are aluminum fillers, which aren’t appropriate for carbon steel.