Goal and options: Where can you get an old transformer for your welder?
output answer: From an old microwave.

Goal and options: What are the steps to clean old metal fixtures?
output answer: Remove fixtures from antique. Place in the kitchen sink or large bowl. Pour white or apple cider vinegar that is 5% acidity into the sink with the fixtures. Put some ketchup in with the vinegar. Let the fixtures soak for a few hours. Wearing gloves, take each fixture and put some extra ketchup on them and scrub them using an old tooth brush. The ketchup helps make a paste to scrub the extra rust off. After scrubbing each fixture, place them back in the vinegar solution and let them rest a few more hours. Scrub more if necessary. Remove from vinegar solution, rinse off with water, and immediately dry with a cloth or paper towel afterwards. If you don't dry them they will oxidize again with the water and create more rust.

Goal and options: how to seal dryer vent leaks
output answer:
Go outside and put silicon caulk on the outside edge of the vents, where it meets the wall.