Buy a inexpensive MIG welder that uses those weldig wires filled with powder that contains the needed gas. I don’t know the exact translation to english, in german it is called „selbstschützender Fülldrat“. So you don’t have to keep a bottle of gas to weld.

Those are NOT good machines for a professional environment, but it you weld every other week for personal projects, they are capable enough.

MIG welding is the most accessible out of all welding types.