Load-carrying capacity of welded joints with defects in hard and soft welds

Shakhmatov, M. V.

doi:10.1080/09507118909446631

Welding International

1989

DOI: 10.1080/09507118909446631

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Load-carrying capacity of welded joints with defects in hard and soft welds

M. V. Shakhmatov

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1999

2009

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Cited by 4 publications

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“…The values of the relative dimensions of the ZTI, for which the welded joint is equal in strength to the base metal as a result of contact hardening, can be determined from a relationship derived from expression (6): (8) We obtain χ d = 0.18 from formula (8) when K u = 1.33 and l /B = 0; this is in good agreement with theoretical (χ d = 0.181) and experimental data from [11]. If the S and H segments of the welded joint are exposed to hardening, it is necessary to substitute 2k S = 2σ y S /√ 3 and K H = k H /k S , respectively, for 2σ u S /√ 3 and K u = σ u H /σ u S in expressions (6) and (8) to determine the average limiting stress σ av .…”

supporting

confidence: 75%

“…An external one-sided surface defect was simulated by acute notches. Satisfactory correspondence is obtained for the new theoretical and experimental values[11]. Optimal ranges are established for the dimensions of the soft interlayers, proceeding from the provision that the bearing capacity of the welded joints is at the strength level of the base metal.…”

mentioning

confidence: 82%

“…(7) Figure 3 shows the theoretical dependence of the relative average normal stresses σ y av /2k S of welded joints with dimensions of 400 × 95 × 25 mm on the relative length of a surface defect l/B, and also theoretical and experimental stress values from [11] for titanium alloys ( (7).…”

mentioning

confidence: 99%

“…Here, the first arc is fed by a dc current, and the remaining arcs by an ac current. In 2004, a system for automated maintenance of welding-arc conditions was Comparison of computed and experimental strength data for welded joints in titanium alloys: ---) results from[11]; --) from formula…”

mentioning

confidence: 99%

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Static Strength of Mechanically Nonuniform Welded Joints with a One-Sided Surface Defect Subject to Ductile Failure

Ostsemin

Dil'man

2005

Chem Petrol Eng

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A new formula is proposed for calculation of the average limiting stress of a welded joint in a thin-wall cylindrical pipe or plate; this formula takes into account the magnitude of mechanical nonuniformity, the dimensions of the softened interlayer, and the depth and width of a surface defect located in the zone of thermal influence of the welded seam. The range of relative depths of a surface defect in a welded joint in pipes, for which the welded joint has a strength equal to the base metal, is determined theoretically.When static loads act on a uniform welded joint formed from metals with a high plasticity, defects of short length and shallow depth will cause a reduction in the strength of the joint approximately proportional to the relative size (or area) of the defect [1, 2]. If the welded joint is mechanically nonuniform, the effect of defects on static strength will be determined by their magnitude and location, as well as by structural-geometric parameters and the degree of the joint's mechanical nonuniformity.Basic causes of defect formation in pipes are poor-quality metal, welding wire, and flux, and imperfection of production, forming, and welding procedures.At the present time, rigid standards (Construction Rule and Regulation 2.05.06-85 "Arterial Pipelines"), which prohibit crack-like defects (lack of penetration, incomplete fusion, undercuts, slag inclusions, cracks, leading-edge extensions, and craters in seams) are established for permissible defects. A considerable volume of repair work is therefore conducted to correct welding defects. These measures cannot be recognized as correct, since experience gained with the service of large-diameters pipes indicates that in the majority of cases, welding defects exceeding existing standards, do not lead to a reduction in the bearing capacity of welded joints in arterial pipelines. Assessment of the service reliability of welded joints in pipes and plates where defects exist, and development of recommendations for determination of degree of risk for crack-like defects assume major practical significance.Various deviations from the assigned procedures, as a result of which the volume of work required to correct welding defects in pipelines increases significantly, however, arise during construction and assembly operations; investigation of the effect of a plane surface defect in the zone of thermal influence (ZTI) of plates and pipes, where plasticity (relative elongation and contraction) reaches a minimum value, is therefore an urgent problem.Dil'man and Ostsemin have investigated the stress state and strength of welded seams in large-diameter straight-and helical-seam pipes with and without defects, and the strength of a mechanically nonuniform welded seam in a pipeline with different defect arrangements in [1-4] and [5], respectively. They present [6] a detailed theoretical analysis of the bearing

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supporting

confidence: 75%

mentioning

confidence: 82%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Static Strength of Mechanically Nonuniform Welded Joints with a One-Sided Surface Defect Subject to Ductile Failure

Ostsemin

Dil'man

2005

Chem Petrol Eng

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“…4, we show the theoretical dependence obtained according to relation (18) and the experimental values of strength of welded joints with incomplete fusion at the center of the weld 400 95 25 × × mm in size [26]. In these joints, an alloy of the titanium-aluminum-vanadium system with ultimate strength σ u S = 875 MPa serves as the base metal and the soft slot-groove welds are made with an admixture of VT5 alloy (σ u SI = 660 MPa) for K u =1 33 .…”

mentioning

confidence: 89%

Strength and stressed state of asymmetric mechanically inhomogeneous welded joints with incomplete fusion at the center of the weld under biaxial loading

Ostsemin¹

2009

Strength Mater

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An approximate solution of the plane problem of the theory of plasticity for main pipelines, cylindrical vessels, and shell structures subjected to biaxial loading is proposed which allows one to perform theoretical analysis aimed at evaluation of strength and stressed state of asymmetric mechanically inhomogeneous welded joints with incomplete fusion at the center of the weld in the case of ductile fracture. Regulating the degree of mechanical inhomogeneity and thickness of the soft interlayer, it is possible to get the uniform strength of welded joints with incomplete fusion and shift fracture processes to the base metal under biaxial tension. We also determine the range of sizes of the domain of incomplete fusion for which the uniformity of strength is attained for the joint with asymmetric mechanical inhomogeneity of the butt weld with incomplete fusion.Keywords: butt joint, soft interlayer, incomplete fusion, ultimate tensile force, contact hardening, asymmetric mechanical inhomogeneity, tangential stresses on the fusion line of the weld, coefficients of mechanical inhomogeneity.The durability and reliability of welded structures in the process of their operation are determined, together with numerous other factors, by the presence of stress and strain concentrators. The role of concentrators is played, e.g., by the events of incomplete fusion in the middle of the weld in the case of two-sided butt welding and in the root of the weld for one-sided welding, the events of faulty fusion between the layers in the case of multilayer welding and along the edges, as well as by the notches, pores, slag and oxide inclusions, and the defective form of strengthening of the weld [1]. These technological defects are often encountered in the process of welding of structures and, hence, the possibility of objective evaluation of their influence on the strength of the joint is an urgent problem that should be solved in designing and monitoring new welded structures.The strength of homogeneous welded joints of low-carbon steels and Kh18N9T steel under conditions of static tension is determined by the net section [1][2][3]. In the case where mechanically inhomogeneous welded joints contain sections with lowered resistance to plastic deformation (soft butt welds), the technological defects of welding are responsible for the complex nonlinear character of changes in static strength [4,5]. This can be explained by the development of three-dimensional stressed state near the defect and in the soft interlayer (weld) as a whole due to the effect of contact hardening of the latter [6,7]. The well-known experimental [1,8,9] and theoretical [5,10] investigations are devoted to the evaluation of the effect of incomplete fusion on the strength of the welds in uniaxial tension.In [1,8], one can find a survey of experimental investigations of the effect of incomplete fusion on the strength of the welds.A zone of incomplete fusion located in the central part of the soft interlayer (in the zone of maximum stiffness of the stressed state) is...

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Analysis of the load-carrying capacity of an operating transmission oil pipeline in the presence of defects in a longitudinal welded joint

Ostsemin¹

1999

Welding International

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Load-carrying capacity of welded joints with defects in hard and soft welds

Cited by 4 publications

References 1 publication

Static Strength of Mechanically Nonuniform Welded Joints with a One-Sided Surface Defect Subject to Ductile Failure

Static Strength of Mechanically Nonuniform Welded Joints with a One-Sided Surface Defect Subject to Ductile Failure

Strength and stressed state of asymmetric mechanically inhomogeneous welded joints with incomplete fusion at the center of the weld under biaxial loading

Analysis of the load-carrying capacity of an operating transmission oil pipeline in the presence of defects in a longitudinal welded joint

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