Like a piece of wire that you may bend back and forth to break it,,so goes all metal,,,if you bend a blade back,,to straighten it,,you will work hardened it,brittle point,,,no I wouldn't do it unless I was disperate....have welded broke brush hog blades,,,wouldn't do it again..think about the person you might be cutting their heads off,,[and it would be totally your fault if it happened,,not real good chance of it happening,but still a chance...]