Which of the following is a benefit of fusion welding?

Fusion welding offers the significant benefit of being able to be automated, which streamlines the welding process and enhances overall efficiency. Automation in fusion welding allows for higher precision and consistency in welds, reducing the potential for human error and improving the quality of the finished product. This can lead to faster production times and can help in scaling operations, making it an attractive option for many manufacturing and construction processes.

The other options highlight drawbacks rather than benefits. Increased material costs would deter the use of fusion welding in many scenarios, longer construction times can negatively impact project timelines, and requiring more labor could increase operational costs and reduce the efficiency gains that automation provides. Thus, the ability to automate fusion welding stands out as a significant advantage in various settings.