Plug Welded Square Tube End

I had the good sense to seal the end of the metal tube, as snow and water would surely be forced inside during use.

 

I cut out a square of mild steel that just fit inside the end, then tacked on a short section of TIG rod to hold it by.

 

I positioned the small square inside the end of the tube, holding it by the TIG rod, then tacked the plate to the sides of the tube. I then cut off the TIG rod, and began running weld beads on top of the plate to fully seal the end of the tube.

 

Being something of a "rush job" I didn't take the extra step of smoothing out the plug weld...

Done