I have used 1/16" ER80SD2 for 3 TIG welded Tube/Fabric projects. I am told this grade is what Cessna uses for 4130 fabrication. One advantage is the wire is usually available in straightened and cut lengths. I once prepared a tubular cruciform tensile test which failed the 1/2" diameter tube at 5,500 lbs tension and away from the welds themselves. Of course this type of test is prepared under optimum conditions, comfortably seated and rotate the part as necessary.