How did welding improve the joining of steel structural members?

Welding significantly improved the joining of steel structural members by enabling the creation of continuous, rigid connections that distribute stresses more effectively between components like beams and columns. Unlike traditional fastening methods such as riveting, which were often disadvantageous for certain applications, welding allows for the fusion of steel shapes, resulting in structures that can be both lighter and longer.12

Key advancements and impacts include:

• Structural Efficiency: By fusing members, welding allows columns and beams to work together as a unified system rather than as independent post-and-lintel elements. This provides greater rigidity and allows for larger spans with fewer, lighter members.2
• Prefabrication: Welding is essential for the production of standard steel components, such as open-web joists and rigid frames, which are widely used in pre-engineered metal buildings.3
• Construction Versatility: It facilitates the creation of complex structural types, such as welded rigid frames for medium spans, and allows for the efficient attachment of roof and floor deck panels to supporting steel members.43

While shop welding is now standard for high-quality, efficient fabrication, field connections often still utilize bolting due to the complexities of quality control and labor costs at construction sites.3