What to do if you are not satisfied with the result of an existing set of tube mill rolls? Maybe the strip edges are not parallel or wavy when entering the welding pass. The question is: Where do I have to modify the rolls in order to improve the result?
A possible way is to redesign the respective forming sequence and roll tools in order to start simulation calculation using the DTM software.
The round tube segment shown in the picture was taken from a tube mill just before the welding pass.
If we try to analyise the material deformation within the forming stands before the welding pass (fin passes) we won´t get any information about a possible overworking of the material.

Only the analysis of the full forming sequence - starting with the first break down pass - will give us a strain diagram showing that respective strip edge buckling shown in the photograph might result from the first forming stands.
Indeed - after having modified the break down passes in practice the buckling effect was gone.
This example shows how simulation technology can influence the result in tube and pipe production. There are a lot of companies still in doubt about efficiency of simulation technology. Only few companies are already using digital simulation systems in order to decrease time and costs for development and production.