What are multi-run welds used for?

Multi-run welds are primarily utilized to enhance the penetration of the weld. This technique involves making multiple passes over the same joint, which allows for deeper fusion into the base materials. A single weld pass may not achieve the desired depth of penetration, especially in thicker sections of metal. By employing multiple runs, the welder can ensure that the joint is adequately filled and that the weld has a strong metallurgical bond with the base materials.

This method is particularly important in applications where structural integrity is critical, as deeper penetration typically results in a more robust and reliable joint. The ability to control the heat input and fill gaps that may exist in previous passes also contributes to the overall quality of the weld. Thus, the focus on improving penetration through multi-run techniques is essential in ensuring effective and lasting welds in engineering applications.