The steel plow was one of the most important advances in agriculture. Before, wooden plows were used but they were not as efficient because they could not cut through rocky soil or cut very deep and they wore out faster.
Yep, you can weld steel to stainless and you can weld stainless to steel. You can use steel or stainless welding rod in either case but the steel or steel welding rod will of course rust.
There are many different types of stainless steel..440c,ATs34, 303, etc..so it heavily depends on what type you're referring to.Ferritic stainless steels would be the ones that have the best...