Arc welding method

An arc welding method, comprising welding a steel sheet while alternately switching feeding of a welding wire between forward feeding and backward feeding,

• wherein the welding wire comprises,
• with respect to a total mass to the welding wire:
• C:
• more than 0 mass % and 0.30 mass % or less,
• Si:
• 0.01 mass % or more and 0.30 mass % or less,
• Mn:
• 0.5 mass % or more and 2.5 mass % or less,
• S:
• 0.001 mass % or more and 0.020 mass % or less,
• Ti:
• 0.05 mass % or more and 0.30 mass % or less,
• P:
• 0 mass % or more and 0.025 mass % or less,
• Cu:
• 0 mass % or more and 0.50 mass % or less,
• Ni:
• 0 mass % or more and 3.0 mass % or less,
• Cr:
• 0 mass % or more and 3.0 mass % or less,
• Mo:
• 0 mass % or more and 1.0 mass % or less,
• Al:
• 0 mass % or more and 0.30 mass % or less,
• B:
• 0 mass % or more and 0.0100 mass % or less, and
• wherein a value obtained by the following formula (1) is more than 1.0,
• 2×[Ti]/[Si]−50×[S] (1)
• wherein in the formula (1), [Ti] represents the content (mass %) of Ti with respect to the total mass of the welding wire, [Si] represents the content (mass %) of Si with respect to the total mass of the welding wire, and [S] represents the content (mass %) of S with respect to the total mass of the welding wire, and
• wherein welding is performed using a shielding gas containing CO2 gas in an amount of 80 vol. % or more with respect to a total volume of the shielding gas at a frequency of 40 Hz or more and 200 Hz or less, where one cycle for determining the frequency is one forward feeding and one backward feeding.