Welded Joints In Austenitic Steels Research Articles

Crack resistance of welded joints of austenitic steel at cryogenic temperature

On the basis of experimental, numerical and analytical results, functional dependences of such crack resistance characteristics as critical opening of cracks in the temperature range from 300 K to 77 K and thickness of welded joints of the steels under study were obtained. The functional dependences of the parameters of the kinetic diagrams of low-cycle fracture on the mechanical properties of the material for a wide class of welded joints of austenitic stainless cyclically stable steels are given.

Features of Acoustic Emission in Tensile Testing of Dissimilar Welded Joints of Pearlitic and Austenitic Steels

This paper presents a study of acoustic emission (AE) during the deformation of dissimilar welded joints of austenitic steel to pearlitic steel. One of the specific problems in these welded joints is the presence of decarburized and carbide diffusion interlayers, which intensively increase in width during long-term high-temperature operation. The presence of wide interlayers negatively affects the mechanical properties of welded joints. Moreover, welded defects are difficult to diagnose in welded joints containing interlayers: due to the high structural heterogeneity, interlayers create structural noises that can hinder the detection of defects such as cracks, pores, or a lack of penetration. The AE method may become a complex decision for diagnosing dissimilar welded joints due to applicability to the testing of heterogenic materials with a complex microstructure. Specimens cut from dissimilar welded joints of austenitic steel to pearlitic steel were tested by tension to rupture, with parallel AE data registration. According to the research results, the characteristic features of the AE were revealed for specimens containing defects in the form of lack of penetration as well as for specimens with diffusion interlayers. The results obtained show that the AE method can be used to test both typical welding defects and diffusion interlayers in welded joints of steels of different structural classes.

Influence of deformation degree of austenitic steels welded joints on structural state and internal stresses felds in weld line zone

Nowadays initial assessment of welding quality is performed by testing equipment with increased loads (high pressure) at technical devices of hazardous production facilities. Test requirements are regulated by standardized documents of the Federal Service for Environmental, Technological and Nuclear Oversight of Russia (Rostekhnadzor). Recently, along with traditional tests, a “stress test” was used – the essence of which is to load pipeline section to the yield point, followed by leak test. However, in scientifc publications there is practically no information about physical processes occurring in the base metal and in welded joints during such tests. In addition, effect of preload (deformation) on the parameters of substructure and internal stresses feld in welded joints of austenitic steels and, consequently, on the further trouble­free operation of the tested equipment was not evaluated. The paper analyzes changes in structural state and values of internal stresses in the samples of austenitic steel under the action of high loads. It substantiates the use of modulated current welding with automatic control of heat input process in molten weld pool. The admissible limits values of plastic deformation are argued when testing technical devices with high pressure for this type of steel. In order to reduce the risk of damage to austenitic steels welded joints of technical devices of hazardous industrial facilities, performed by pulsed welding with small­drop transfer, and to exclude formation of microdefects in them, high pressure tests (stress test) can be performed under loads that create deformations in metal, not exceeding 5 %. For joints welded by manual arc welding, deformations should be less than 5 %. Welded joints made by pulsed welding with large­drop transfer (with and without defects) are not recommended to be tested with high pressure.

Statistical thermodynamic analysis of the structural composition of welded joints in austenitic steels

Statistical thermodynamic analysis of the structural composition of welded joints in austenitic steels

Ultrasound inspection of welded joints in austenitic steels

(1999). Ultrasound inspection of welded joints in austenitic steels. Welding International: Vol. 13, No. 4, pp. 329-332.

Structure and corrosion resistance of welded joints in austenitic steels after laser surface treatment

Structure and corrosion resistance of welded joints in austenitic steels after laser surface treatment

Hot cracking resistance of welded joints in austenitic steels produced by high-speed laser welding

(1997). Hot cracking resistance of welded joints in austenitic steels produced by high-speed laser welding. Welding International: Vol. 11, No. 2, pp. 149-151.

Formation of macroband structures in deformed welded joints in austenitic steels

Formation of macroband structures in deformed welded joints in austenitic steels

Static strength and ductility of welded joints in austenitic steels with undercutting at 77K

Static strength and ductility of welded joints in austenitic steels with undercutting at 77K

Effects of stabilisers and ferrite phase on the corrosion resistance and ductility of welded joints in austenitic steels with an increased silicon content

Effects of stabilisers and ferrite phase on the corrosion resistance and ductility of welded joints in austenitic steels with an increased silicon content

Effects of relaxation of the stresses in welded joints in austenitic steels on their susceptibility to local breakdown during short cycle creep

Effects of relaxation of the stresses in welded joints in austenitic steels on their susceptibility to local breakdown during short cycle creep

Determination of ferrite-phase content of welded joints of austenitic steel carried out by automatic welding

Determination of ferrite-phase content of welded joints of austenitic steel carried out by automatic welding

Relieving stresses in welded joints of austenitic steel

Relieving stresses in welded joints of austenitic steel