Numerical analysis of welding residual stress using heat source models for the multi-pass weldment

Bae, Dong Ho; Kim, Chul Han; Cho, Seon Young; Hong, Jung Kyun; Tsai, C. L.

doi:10.1007/bf02984424

Cited by 24 publications

(16 citation statements)

References 7 publications

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“…In this study, the heat input model using ramp function as shown in Figure 6 based on the concept of Pavelic's disc model was employed [25,26]. The element rebirth technique [24] was applied to simulate the multi-pass weld metal deposition effect.…”

Section: Heat Source Model For Numerical Analysismentioning

confidence: 99%

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Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

Ahmad

Hwang

Lee

et al. 2017

Metals

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Abstract:The reliability of welded structure can be evaluated through welding residual stress analysis and fatigue strength assessment. In this study, welding residual stresses of multi-pass dissimilar material welded joint between alloy 617 and 12Cr steel were analyzed numerically and experimentally. Fatigue strength was then assessed in the air. Based on results of welding residual stress analysis and fatigue strength assessment, a fatigue design method considering welding residual stress was investigated. Welding residual stresses at the weld of dissimilar welded joints distributed complicatedly on longitudinal and transverse directions, showing differences but a very similar distribution tendency between numerical and experimental results. Numerical and experimental peak values of welding residual stresses at HAZ of the weld on the 12Cr steel side were predicted to be 333 MPa and 282 MPa HAZ, respectively. The fatigue limit of dissimilar material welded joint between alloy 617 and 12Cr steel was assessed to be 306.8 MPa, which was 40% of tensile strength (767 MPa) of dissimilar material welded joint. However, the stress range including welding residual stress was assessed to be 206.9 MPa, which was 14% lower than that calculated by including the effect of residual stresses.

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Section: Heat Source Model For Numerical Analysismentioning

confidence: 99%

“…In this study, the heat input model using ramp function as shown in Figure 6 based on the concept of Pavelic's disc model was employed [25,26]. In this case, the total amount of heat input is indicated as the combination of surface heat input and body heat input as shown in Equation (2):…”

Section: Heat Source Model For Numerical Analysismentioning

confidence: 99%

Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

Ahmad

Hwang

Lee

et al. 2017

Metals

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“…However, welding processes produce residual stresses and change the metal structure as a result of the large nonlinear thermal loading created by a moving heat source. These formidable residual stress generation and metallurgical change by fusion welding process increase the cracking driving force and reduce the resistance of brittle fracture as well as environmental fracture [1][2][3]. In particular, the welds are more sensitive to corrosive environments than base metal.…”

Section: Introductionmentioning

confidence: 98%

Assessment of the sulfide stress corrosion cracking characteristics in the multi-pass weld of the A106 Gr B steel pipe

2009

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Sulfide stress corrosion cracking (SSCC) in crude oil field environment containing hydrogen sulfide (H 2 S) has been recognized as a material degradation and damage mechanism. Laboratory data and field experience have demonstrated that extremely low concentration of H 2 S may be sufficient to lead to SSCC failure of susceptible materials. In some cases, sulfides may act synergistically with chlorides to produce SSCC failures. SSCC mechanism is a form of hydrogen embrittlement that occurs in high strength steels and in localized hard zones in weld of susceptible materials. In the heat-affected zones adjacent to the weld, there are often very narrow hard zones combined with regions of high residual stress that may become embrittled to such an extent by dissolved atomic hydrogen. On the basis of this understanding, SSCC tests were conducted with smooth specimens of the multi-pass welded ASTM A106 Gr B steel pipe used in the oil industries. And SSCC resistance according to the welding processes was evaluated. From the results, the weld by GTAW+FCAW showed the largest resistance against SSCC.

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“…And, these formidable residual stress generation and metallurgical change by the fusion welding process increase the cracking driving force and reduce the resistance of brittle fracture as well as environmental fracture (Achilles and Bulloch, 1987 ;ASTM Metals Hand Book, 1981: Jones. 1992Bae et al, 2002). In particular, Al06 Gr B steel, which is used in the nuclear power plant and heavy chemical plant, has been damaged during the service by various corrosion mechanisms such as corrosion fatigue, Therefore, investigating its electro-chemical corrosion mechanism and failure mechanism by the corrosion fatigue, and evaluating the fracture characteristics on the welds of the material are very important for the safety and integrity diagnoses of facilities, life prediction of the degraded materials, and establishment of the economical inspecting term.…”

Section: Introductionmentioning

confidence: 98%

Corrosion fatigue characteristics in the weld of multi-pass welded A106 Gr B steel pipe

Bae

Kim²

2004

KSME International Journal

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In order to investigate the corrosion fatigue characteristics in the weld of multi-pass welded A106 Gr B steel pipe, corrosion fatigue tests were performed under the various stress ratios and 3.5 wt% NaCI solution at room temperature. The corrosion fatigue characteristic curves were represented using crack closure concept. The obtained results are as follows; when the load frequency is 1.0 Hz, the crack opening point is transited in the region of Kmax=20 -32 MPa'm 1/z. In the low stress intensity factor range, the crack opening point is higher than that in air. However, in the high stress intensity factor range, it is lower than that in air. In the cases of 0.1 Hz and 0.01 Hz, the crack opening point gradually decreases to Kr~n with Kmax increase.

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Numerical analysis of welding residual stress using heat source models for the multi-pass weldment

Cited by 24 publications

References 7 publications

Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

Welding Residual Stress Analysis and Fatigue Strength Assessment of Multi-Pass Dissimilar Material Welded Joint between Alloy 617 and 12Cr Steel

Assessment of the sulfide stress corrosion cracking characteristics in the multi-pass weld of the A106 Gr B steel pipe

Corrosion fatigue characteristics in the weld of multi-pass welded A106 Gr B steel pipe

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