CDFingers

I have lincoln mig welder tips with a 0.9mm thread. The threads fit loosely into the flare fitting, but the shaft of the mig tip fits snugly into the flare fitting. Question: Would using a bit of JB weld or other means like brazing to secure the mig tip to the flare fitting, be an acceptable design variant? If not I will order order the Twecos such that I can cut threads into the flare fitting.