Bloody scoop I did upload the second pic twice but still I can't see it but anyway that pic is reason enough to rip them off and start again.

Please dont see this as being picky but the last thing we'd like to see is your tower coming down due to those welds breaking.

If the gentleman's amps were high enough and he gets enough penetration with his rod then even if the weld looks like it was done by the Mud Dobbers, it's a good weld. I would have been burning a mild rod at 180 amps for that four inch pipe weld. The high amps would have made sure all the carbon impurities flowed out of the weld itself. Keep your weld moving as you don't want to burn holes in the pipe.

If you're unsure, knock the slag off with an angle grinder and weld over using a sweeping motion from pipe to plate rather than a puddle action like they taught you in welding school. There is no purpose served in cutting them off and starting over.

The plates look like quarter inch steel. If one can pull the hole out of that puppy you have more problems than worrying about if that tower is still standing. Use high strength shackles and bolts. Don't try and loop your cable through that hole. It will chaff the cable and cut it, possibly causing a failure at that point. Go into your farm store and see if you can't find a clevis that will do the trick for you.