Looks like a surface weld with no penetration. If you can grind it off, do so. If not, clean it up and follow advice above.
I have an Old Country Angus and the welding sucks. Lots of surface welds, no penetration, etc.
Smooth Smoke BBQ Team, KCBS CBJ, 2-WSM, Cajun Bandit Conversion, wsm 2880, Smokey Joe Mini wsm, Old Country offset, several kettles.