What fabrication process should be used on column ends for a compression joint that relies on contact bearing for load transfer?

For a compression joint that relies on contact bearing for load transfer, milled ends are the most suitable fabrication process. This is because milling provides a flat, smooth surface that ensures full and uniform contact between the surfaces of the columns. This type of precision in achieving a well-defined bearing surface is crucial for effective load transfer, as it minimizes stress concentrations and potential failure points.

Milled ends allow for consistent bearing areas, enhancing the structural integrity of the joint by promoting even load distribution throughout the connection. This is essential in compression joints where the forces exerted on the connected elements can be significant. The quality of the milled surface aids in maintaining the necessary alignment and capacity of the joint when subjected to axial loads.

Other methods such as welded ends, cut ends, or forged ends may not offer the same level of precision and surface integrity. Welded ends can introduce irregularities and residual stresses that may affect load transfer, while cut ends may have a rough texture that could lead to inadequate contact. Forged ends are usually not relevant in this scenario, as they are typically used for forming complex shapes and do not guarantee the same flat contact surface needed for effective load transfer in compression joints.