Which method is most commonly used to join steel beams?

Welding is the most commonly used method for joining steel beams due to its ability to create strong and continuous joints. When welding is performed correctly, it effectively fuses the steel parts together, resulting in a joint that can often be as strong as, or stronger than, the base materials themselves. This is particularly advantageous in structural applications where the integrity and load-bearing capacity of the joint are critical.

Welding is also a versatile method that can accommodate various structural designs and configurations, making it suitable for a wide range of construction scenarios. Additionally, once the welds are made, they can often be ground smooth and finished, contributing to an aesthetically pleasing appearance and reducing potential stress concentration points.

While bolting is popular for certain applications due to its ease of assembly and disassembly, as well as for conditions where heat from welding could cause problems, it does not provide the same level of continuity in the joint as welding. Riveting was a common method in the past, particularly in bridge construction, but has largely been replaced by welding in modern steel fabrication. Screwing, while useful in wood or light metal applications, is not typically used for steel beams due to the high forces and loads they must bear.