INTRODUCTION the management of railway infrastructure, as well as any other body that is reliable for the supervision of the rail system, is responsible for the construction of the most innovative infrastructures, which tend to be financed by the Government, as well as the workload of maintenance throughout the whole rail system so that they are in the proper State for use both for conventional trains as the high-speedas well as the so-called load used primarily for maritime transport services. This task cannot be performed if the administration or agency in question is not equipped with adequate technological resources so that you can choose to certify and validate its suppliers and thus make the infrastructure of the quality needed for a delicate and strategic as the railway sector. The multiplication of the speeds reached by trains that are currently operating has resulted in a significant multiplication of dynamic tensions that tracks and all anchoring devices must withstand. Therefore, the purchase of any material, equipment or system must be subjected to demanding tests, which are carried out in order to verify that they are appropriate and to confirm that they comply with all the requirements that are demanded. In view of the fact that the components are not standard and vary greatly from one provider to another, not only in its form but also in their composition (metals, polymers, ceramics and composites), it is essential to carry out independent in each of these trials, as well as testing as a whole, in order to ensure that they adequately respond to all items that they interact with each other. Today, the fact that the materials supplied are solid and resistant is not enough, but that are also required to give passengers greater comfort trials of fatigue in welds of joints of high speed routes FERRAS there are a number of differences between typical welds and welds used in the railroad tracks: The composition, the types of stresses to which are subjected, processes of welding, etc these detailed characteristics will force to perform exact mechanical tests to make sure that the welding process is correct and that the mechanical properties of the joint are adequate.