[alfonso]

Thanks for all the excelent replys...I know in construction, All welding on rebar is a no-no- unless the contractor can identify The ASTM_weldable grade, and that it is welded with E-7018 LH by a WELDER not a wantabee. {Wantabee's make excelent welders after much practice and learning though! not on buildings first] Since there are so may piles of rebar around jobs, the risk is too great to get the wrong quality and weld up a falure in the work. The problem is a lot of sulphur, carbon content, and other impurities in the low grade rebar that embritle and cause failures when heated at welding/forging temps I guess.
ALTHOUGH I SEEM TO HAVE HAD GREAT RESULTS as Rutterbush, I will heed the warnings given also! I have had HSS endmills break off and hit me in the past, I don't need pieces of tools made from rebar !
All I know is that I got this rebar from My good old HOME DEPOT...If it was made in the GOOD OLD USA or not I don't know. It [1/2"] sells for $3.99 for a 10 length retail for goodness sake!