Ok you set it at about 17 LPM ,back it of to ten and if you can hear it coming out grab a bit of steel that's not gal or painted and try another weld , I'm still not sure on wire composition it should be copper coated mild steel wire or general purpose I'd hate to think you've got some fancy alloy wire that's special purpose .
Some fittings don't require Orings but you can test for leaks with soapy water and if it was supposed to have an Oring there would be a groove for it and you might not be able to tighten it properly without one making the fitting loose .