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As a final point, note that there is a new filler metal specification, AWS A5.36/A5.36M:2012, “Specification for Carbon and Low-Alloy Steel Flux Cored Electrodes for Flux Cored Arc Welding and Metal Cored Electrodes for Gas Metal Arc Welding". It covers both carbon steel and low alloy flux-cored electrodes, as well as carbon steel and low alloy metal cored electrodes. It is the first of a new and improved style of filler metal specifications. It is effective now and runs in conjunction with AWS A5.20 and A5.29 until 2015. At that point the old specifications will be obsolete and the new A5.36 specification will be the only one in effect. While the usability designations are similar to those in A5.20 and A5.29, it does include a few slight changes and some additional ones involving metal cored wires. However, discussion of this new A5.36 specification is for a future column
Rudy Ray wrote:For what you are doing a 0.035 NR-211 would work just fine. All position, any direction, even left handed with a mirror, and it welds better over zinc than on clean bare steel.