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Explosive welding allows joining metals and alloys in almost any combinations unlike various types of fusion welding. It provides the ability of manufacturing products with a combination of service properties of applied materials with a high level of strength, tightness, fatigue strength, etc. In addition to bimetals produced in fairly large volumes for chemical and oil equipment, explosive welding is used to manufacture products with special characteristics for different industries. Producing coaxial joints (welding is performed along generatrices of axisymmetric coaxial tubes) can be attributed to a special class of tasks, since they are more economical than alternative methods of their production. In some cases, a permanent joint can be created by explosion compression without welding of elements to be joined. This work presents a number of technological processes for manufacturing coaxial products developed at the PWI, which use both welding and explosive compression. The presented developments testify that a wide range of practical tasks can be solved with the help of explosion. [ABSTRACT FROM AUTHOR]

The most common defect in the axles of wheelsets of railroad cars of the RU1Sh type is damage or wear of M20 threaded holes for bolts for fixing the locking strips of roller bearings. It is proposed that such threaded holes be repaired by cladding them with a restoring sleeve and then cutting a new thread. Fatigue tests of the repaired threaded holes showed that their durability practically corresponds to the basic values for new axles. The repair technology was tested on two full-scale axles mounted on a railcar bogie and subjected to route tests. The railcar with repaired axles traveled 35,000 km without damaging or wearing the restored threaded holes. [ABSTRACT FROM AUTHOR]