Residual Stresses in Welded Components Following Post-weld Treatment Methods

Suominen, Lasse; Khurshid, Mansoor; Parantainen, Jari

doi:10.1016/j.proeng.2013.12.073

Cited by 34 publications

(22 citation statements)

References 10 publications

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“…Measured surface residual stresses after peening collected from literature and the analytical lower‐bound estimate σ res / f u = −9/32 (plane stress) predicted by Tirosh …”

Section: Fatigue Strength Prediction Of Peened Butt Weldsmentioning

confidence: 99%

A new proposal for assessment of the fatigue strength of steel butt‐welded joints improved by peening (HFMI) under constant amplitude tensile loading

Nykänen

Björk

2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T Experimental fatigue data for butt-welded joints in as-welded condition and under constant amplitude tensile loading were analysed using the effective notch stress system and a new master curve analysis that takes the local stress ratio, R local , into account. The local stresses needed for computation of R local are calculated with the notch strain approach in conjunction with the reference radius concept. The main focus was to predict with the derived master curve the fatigue strength of peened butt-welded joints. The lowest surface residual stresses after peening were first estimated based on reported measurements and an analytical lower bound result. The predictions showed quite similar strength dependences and FAT values as reported for high-frequency mechanical impact treated welds for applied stress ratio R = 0.1. The benefits of peening reduce faster for higher strength steels when R increases. When R = 0.5, the FATs are practically the same for all steel grades.Keywords butt joint; effective notch stress; fatigue; improvement; local stress ratio; residual stress. N O M E N C L A T U R EASW = as-welded condition ENS = effective notch stress approach FAT = IIW fatigue class, fatigue strength corresponding to two million cycles GMAW = gas metal arc welding HAZ = heat affected zone HFMI, HFP = high frequency mechanical impact treatment (generic term) HSS = high strength steel IIW = International Institute of Welding MSSPD = minimization of the sum of squared perpendicular distances from a line NS = nominal stress approach QC = quenched and cold-formable steel SINTAP = structural integrity assessment procedure SWT = Smith-Watson-Topper approach TIG = tungsten inert gas welding UP = ultrasonic peening (device name) C = fatigue capacity E = Young's modulus f u = ultimate strength, nominal f y = yield strength H = cyclic strain hardening coefficient K f = fatigue effective fatigue stress concentration factor between notch stress and nominal stress K HP = improvement factor K m = structural stress concentration factor Correspondence: T. Nykänen.

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“…Measured surface residual stresses after peening collected from literature and the analytical lower‐bound estimate σ res / f u = −9/32 (plane stress) predicted by Tirosh …”

Section: Fatigue Strength Prediction Of Peened Butt Weldsmentioning

confidence: 99%

A new proposal for assessment of the fatigue strength of steel butt‐welded joints improved by peening (HFMI) under constant amplitude tensile loading

Nykänen

Björk

2015

Fatigue Fract Eng Mat Struct

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“…X-ray diffractometer Xstress 3000 G3/G3R (figure 2) was used to measure residual stresses. Residual stresses in the building-up and the adjoining areas were determined by x-ray sin2 ψ-method [10,11]. The optical scheme of the x-ray photography with "omega" goniometer configuration was used to record the position of the diffraction maximum.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of residual stresses in lock valve elements of petrochemical productions

Николаева

Mashukov

2017

MATEC Web Conf.

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Abstract. Lock valves of the pipeline is an important and responsible product. It is designed to shut off the flow of liquid or gaseous fluid. During transportation ambient temperature reaches 400ᵒC, and the pressureover 30 MPa. Leakage of the fluid through the details and components of lock valves is not permitted. The batch of high-pressure valves was withdrawn after some time of its usage at the petrochemical enterprise. Premature wear of input branch pipe saddles was dis-covered. The cause of destruction of the input branch pipe saddles was erosion be-cause of abrasive particles, which are present in the working fluid. Locking node of the high-pressure armature is highly loaded element. The welding depositions are widely used to increase the strength of the valve locking node. It is established that under recommended heat treatment of the valve an ordered microstructure is formed and residual stress in the welding deposition zone is reduced. The article shows the relationship of residual stress with microstructure of the material. The magnitude of residual stresses in high-pressure valve locking node -in the brunch pipe saddle and the adjacent zoneswas determined by x-ray method.

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“…The magnitude of compressive residual stresses depends on the yield strength fy of the treated material and increases with increasing yield strength. Residual stress measurements [5][6][7][8][10][11][12][13][14] show that compressive residual stresses at the treated surfaces transverse to the welding direction can reach values of approximately 75 % of fy and values that are higher than fy because the local strength can be increased due to cold hardening. Induced compressive residual stresses can appear up to a depth of 1 to 2 mm from the treated surfaces.…”

Section: High Frequency Hammer Peeningmentioning

confidence: 99%