I goofed in my first reply to your post. I did not notice that you had bought a Miller machine. I thought, from the model number, that you had bought a Lincoln machine. And besides the two wirefeed welders I have I also have a 200 amp Lincoln square wave TIG welder, which I love. So anyway I thought I should say that I also own two Miller welders. One is an ancient Miller Gold Star welder. It is at least 40 years old and still works great. The welder is an AC and DC TIG and stick machine but it has a special setting. At the lower range it has a 1 to 10 amp range. This was a rare special that Miller offered and when I bought the machine used I lucked out because I used that really low amperage setting a lot. I also have a Miller 300 amp wire feed welder. It came with a 25 foot long push-pull whip, called a Python. A push-pull whip differs from the usual whip on a wire feed machine in that it has a motor in the welding gun that pulls the wire while the welding machine pushes the wire. This is especially useful when using aluminum welding wire because it is so soft compared to other welding wires. And 25 feet is way to far to push aluminum wire. It is also too far to push .023 diameter steel wire. Anyway, the machine is a beast. Not only will it weld at 300 amps on a 60% duty cycle, but it will do so for years and has so many features that it is smarter than me. And it welded the Whidbey Island Fire Boat for the South Whidbey Fire Department. From scratch. I bought the welder used from the company that built the boat. So I am sure your new Miller machine will give you many years of good service. Especially after I looked at the specs for your welder I am convinced you will be able to make good welds pretty fast if you have even a small modicum of skill. That machine will make a lot of decisions for you so that making good welds will be easier. The specs say it can weld 3/16 steel with one pass. This means, with proper preparation and skill, you will be able to weld at least 1/4 inch thick steel with multiple passes. With pre-heating, such as with a weed burner torch, you should be able to weld 5/16 thick steel.
Eric