In steel structure engineering, welding remains the most commonly used method of joining components. Its popularity stems from several advantages: welded joints have a straightforward configuration, the welding process can be highly automated, and the resulting connections are tight and reliable. Welding also accommodates a wide variety of steel member shapes and dimensions. For elements that must resist large bending moments or require exceptionally strong joints, welding is often the optimal solution.
However, welding is not without drawbacks. The heat generated during the process creates a relatively large heat-affected zone, which can cause deformation near the weld. Residual stresses from welding may also influence the member’s load-bearing performance. For these reasons, selecting welding as the connection method should involve careful consideration of the structural system, loading conditions, construction environment, and overall safety requirements.
High-strength bolts are another widely used form of connection in steel construction. They are particularly suitable for heavily loaded joints, such as those found in long-span roofs or tall buildings. High-strength bolted connections offer advantages, including high tensile capacity, favorable elasticity, and straightforward installation procedures. Nevertheless, their behavior under large dynamic forces or when transmitting bending moments requires close attention to ensure the joint performs as intended.
In summary, welding and high-strength bolting are the two dominant connection techniques in steel structure projects. The choice between them should always be based on a comprehensive evaluation of project-specific factors to achieve both safety and structural effectiveness.
