If you are breaking welds with a beam type torque wrench, the problem
isn't the wire or rod being used...
Not that high?? What, exactly, does the average hobbyist or home welder need that 70k PSI is not adequate for? Unless you are building pressure vessels, 7018 is more than adequate (and in some cases, still adequate). Besides, most of your common mild steels (1018 or A36) have tensile strength ratings in the 63k to 78k range, with most of them falling in the 65-70k range. Please explain to me how having a wire or rod with a tensile strength greater than 70k makes any difference when the metal being used is rated at less than 70k PSI??
For the typical welding novice, wire strength makes absolutely no difference if the welds are porous....or have no penetration....or are contaminated. Suggesting that MIG might be better because the weld is stronger due to higher PSI rods is foolish, as I can pick up a can of 100k+ PSI Lincoln rods Monday morning. Point is, its not necessary, and even claiming one is "stronger" than the other shows a limited understanding of the processes and equipment available to each.
Its possible you may have forgotten more than you realize in the last couple decades!