That's just one example of many of the imaginative paths you can take as a creative metal worker. Additionally, my city Norfolk, VA builds massive steel ships in the harbor that sail all over the world, if that sounds interesting!
I'm not a welder but have several in my close family. As Aaron pointed out, some welders get to be super creative in a full-on artistic role. Likely, most welding jobs are going to involve less free-form creativity than building a multi-story art installation. Welding definitely is a heavy science field as success requires a firm grasp of welding techniques and metallurgy. Even if a welder's day job involves less creativity it certainly can lead to a side gig or hobby as a metal artist.