Which device or method is approved for fastening steel joists to other steel members?

Fastening steel joists to other steel members can be accomplished through various approved methods, each offering distinct advantages depending on the specific application and requirements.

Welding is a widely used method for attaching steel components due to its ability to create a strong, permanent bond. It ensures that the connection can withstand significant loads and stresses, making it suitable for structural applications where durability is essential.

Self-tapping screws are another effective fastening solution. They can be used for quick assembly and disassembly, which is beneficial in construction environments where speed is important. These screws can penetrate the steel surfaces and create a robust connection that holds well under various conditions.

Steel pins can also be employed, providing another option for fastening. They generally serve as mechanical connectors that can handle tension and shear forces effectively.

By recognizing that all these methods are valid and approved for fastening steel joists to other steel members, it becomes clear why the most comprehensive answer is that they can all be used. Each method may be preferred in different scenarios based on factors such as the design requirements, environmental conditions, and specific load capacities needed for the project.