Processof Grinding After Welding

Grinding smooth after welding how strong weld talk rinding smooth after welding how strong 09152004, 0255 am need to butt weld some 0 1 x 3" tubing after i weld it i want to grind it smooth so when i paint it the weld wont stick out like a sore thumb how much weaker will it be if i grind the weld smooth with the surface of the tubing.