One of my other hobbies brings me to the beach. I jets in the surf when I can. I made a 2" square tube beach cart in November. I did it quick and dirty (MIG spool gun) to get me on the water that same week.

Down at the beach it worked pretty well, successfully launched and retrieved my standup ski several times. However, when I swamped my girls sit-down ski, i tired to pull it out of the water with id guess 50 gallons of water in it. My ski weighs in around 300lbs dry, hers is about 700 plus 50 gallons of water. Needles to say it stressed my cart and some of the welds cracked. one ramp portion broke off.

Now I am trying to repair this, and I am cleaning the aluminum as good as I can, but this thing was completely under water (salt water) so i know there is some serious corrosion in the tubes. I prepped the broke off part and TIG welded it back- i have no date so I can take my time.

But I am getting some nasty peppering in the welds- anything I can do to help eliminate this? or am I doomed since I cannot access the inside of the square tube?