What type of artwork made of welded steel is located at 1515 Poydras Street?

The artwork made of welded steel located at 1515 Poydras Street is indeed known as the Krewe of Poydras. This particular piece was created by artist John Scott and is significant as it represents New Orleans’ unique cultural heritage and the famed Mardi Gras krewes that are a vital part of the city's festive traditions. The Krewe of Poydras specifically honors the contributions of various krewes, celebrating the lively spirit and community engagement that Mardi Gras embodies.

Other options like the Liberty Monument and General Robert E. Lee are notable historical monuments, but they do not pertain to welded steel artwork at that specific location. The Latin American Heroes also represents a different artistic theme and is not related to the Krewe of Poydras artwork. Therefore, the Krewe of Poydras stands out as the correct answer due to its specific artistic focus and location.