Like Clemsonfor, I started with the HF $90 AC flux core wire welder. Everything I repaired with that has stayed welded but the welds look crude and lots of splatter to grind off. Then I found a yard sale $50 AC-230 amp ancient unit. Those are indestructible, there's nothing inside but a big transformer with massive windings. That size has the power to burn down through rust on heavy material using 6011 rods. Its the classic old-school farmer's welder, for fabrication and especially for where the need was to get critical equipment repaired and back in service right now with minimal prep. A modern welder will make prettier welds.
I now mostly use a HF-180 'mig' wire welder that the first owner extensively modified to make it almost as good as name-brand. I run flux-core only, just for the simplicity.
Watch welders on Craigslist and buy an old unit from a reputable company. You will find it easier to use compared to a new cheap unit. Avoid old blue HF welders.
If you decide to buy a welder, here are some photos for an idea what to expect at the beginner/amateur level and with inexpensive welding gear. (Over $1,000 is a whole different world!)
Photo: weld made with HF 90 amp AC, flux core. That is a component of
this lifter I built for my spike harrow.
Two pieces of rusty scrap spliced to make the drawbar that pulls the spike harrow's chains. Used the AC-230 and 6011 deep-penetration rod for this.
Another rusty-scrap project with the AC-230, rear forks for the QHitch. I ground the weld areas as clean as possible. 10+ years use now and nothing has broken.
The welders I used back then.
The modified HF-180, also a tig-capable welder I bought off Craigslist a couple of years ago. About $100 for both after replacing missing spool, plugs, cables.
Recent flux-core project with the HF-180. Put a hitch on the YM186D bucket.
Get a welder! You will wonder how you ever got along without it!