When welding steel, there are two common wire types. There is an AWS classification ER70S-3 for all-purpose welding. You should use the ER70S-6 wire when more deoxidizers are needed for welding on dirty or rusty steel. As for wire diameter, .030-in. diameter makes a good all-around choice for welding a wide range of metal thicknesses in home and motorsports applications. For welding thinner material, use a .023-in. wire to reduce heat input. For welding thicker material at higher total heat levels, use .035-in. (or .045-in. wire if it's within your welder's output range).
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