Cop­per and aluminum

When join­ing mate­ri­als of dif­fer­ent types such as alu­minum with cop­per, good process man­age­ment is extra­or­di­nar­i­ly essen­tial. If the two mate­ri­als mix too much, inter­metal­lic phas­es are formed that are brit­tle and unde­sir­able. If the weld­ing depth is too low, the con­nec­tion cross-sec­tion is no longer suf­fi­cient to achieve the desired ten­sile strength. In this appli­ca­tion exam­ple, we found an approach to deter­mine the mix­ing of the mate­ri­als dur­ing weld­ing indi­rect­ly. The pic­ture shows the top view of the seam. It can be seen that the under­ly­ing curve of our sig­nal cor­re­lates with the alu­minum con­tent on the top of the weld seam.