Assessing the degree of danger of defects in the welded joints

Defects of welded joints create great risks during long-term of steel pipelines operation, concentrating of mechanical stress and having an ability to propagate quickly and unpredictably, leading to unexpected destruction. In fracture mechanics, for an objective assessment of the danger of a metal defect in a steel pipeline detected by technical means of flaw detection...

Inspecting and recovering the metal of drilling pipes residual service life

The drilling pipes are usually produced from extra strong grades of steel, the high mechanical properties of ones are provided by intensive alloying and hardening of the metal. The Metalurgists are knows that the higher the degree of hardening the more unstable state of metal structure is obtained...

Mechanical stress of railways metal inspection

The mechanical stress accumulated by the metal in local areas of steel rails during long period of time are gradually results to cracks appearance, so they cause the main reason of major accidents on the railways...

Residual stress of steel pipes inspection and relaxation

When the overhaul of the underground steel pipeline is carried out, each pipe of one to be welded in should be preliminarily inspected. If even minimal cracks in the metal detected the pipe is not to be approved for use. However the cracks are frequently appeared in the metal immediately after welding...

Diagnosting the steel pipelines during recovery of protective insulation

The common task of steel pipelines diagnostics is residual service life (life time) predication for each pipe, which is carried on the results of most dangerous defects linear features evaluation...

Steel vessels the metal stressed state inspection

A steel vessels and industrial liquid containers have large surface of cover and exposed permanently to different factors causing the metal to complex plane (two-axial) stressed state...

Determining the causes of disbalanced gas turbines assemblies

During the gas turbines maintenance the mounting wheels of ones to the shaft is carried out by the way of pressuring the shaft cooled by the liquid nitrogen into the hub of wheel heated by the hot air jet...

Providing an optimal tightening effort of steel studs and bolts

General condition of reliability and durability of threaded joints in the housing power engineering equipment is the uniformity of steel studs and bolts tightening effort distribution...

Inspecting the magnetic systems of electrodynamic loudspeakers

Electrodynamic loudspeaker or simply loudspeaker - is the device transforming electrical signals to sound waves through oscillations of voice coil, driven...