I decided to do a little destructive testing/comparison between er70s2 rod and er308L rod that I had laying around......it was quickly obvious that the 308L rod performed better on this cast iron.
Here is what I did, removed a cast part off of old HF jack and welded it to the old jack, then took a 3lb sledge hammer and struck it.
Test 1: ER70 rod, seemed to weld nice, looked decent, however upon striking it with the hammer the weld ripped in half and the piece went flying.......which is bad lol
Test 2: ER308L rod, seemed to weld nice, looked decent, 1st strike with the hammer flipped the jack around about 1 full revolution, 2nd strike formed hair line fracture outside of weld bead, 3rd strike broke the test piece however the weld remained intact...............I also decided to try and break off the weld by hitting it with the hammer....after about 10 hits as hard as I could and it not moving (but sending sparks) I decided it wasnt going anywhere.
(note this was done with zero pre/post heating)
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