The joint surfaces for welding should be...

The joint surfaces for welding should be matching and smooth to ensure a proper bond between the materials being joined. When surfaces are smooth and match well, it allows for better penetration of the weld material into the base materials, which leads to stronger and more uniform welds. Smooth surfaces reduce the likelihood of inclusions, defects, and impurities being trapped in the weld seam, which can compromise the integrity of the welded joint.

Achieving a good fit between the joint surfaces minimizes gaps and areas where stress concentrations could occur, which is crucial for maintaining the strength and performance of the welded structure. Additionally, smooth surfaces can facilitate better heat transfer during the welding process, contributing to a more effective and consistent weld pool.

A surface that is roughened or textured can create inconsistencies in the weld and may not allow for the required material flow, resulting in weaker bonds. Therefore, smooth and matching surfaces are essential for effective welding to achieve high-quality, reliable joints.