Numerical models of in-service welding of gas pipelines

Sabapathy, Prakash Niranjan; Wahab, Muhammad Abdul; Painter, M. J.

doi:10.1016/s0924-0136(01)01032-9

Cited by 42 publications

(19 citation statements)

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“…The thermal distribution being a quasi-stationary problem [2,4,5] (i.e. the thermal distribution does not change in a local reference associated to the heat source), excepted near the border of the welded plates, 2D calculations are often preferred.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Experimental and numerical investigation of the weld repair of superplastic forming dies

Branza

Duchosal

Fras

et al. 2004

Journal of Materials Processing Technology

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Superplastic forming process (SPF) is an advanced process conducted at high temperature using moderate strain rates, typically used for shaping TA6V sheets for aerospace applications. Thermomechanical stresses on the forming dies due to successive forming cycles may result in the early degradation and even fracture of SPF tools through fatigue crack propagation. To reduce cost and extend service life, dies are generally weld-repaired and subsequently re-used in the typical severe conditions of SPF. The implementation of robust, easy processing welding techniques resulting in high quality repair able to sustain cumulative thermomechanical stresses is of utmost concern to SPF parts manufacturers. The paper focuses on the development of an automated TIG technique to weld repair high nickel, high chromium heat resistant alloys based on a complementary approach including thermal instrumentation, numerical simulation using Sysweld TM and metallurgical investigation; this former being performed on either as-received, repaired and repaired plus damaged materials.

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Section: Numerical Simulationmentioning

confidence: 99%

“…The heat-source distribution is given by the model developed by Goldak et al [2], often called double ellipsoidal heat source [4], which defines a volumic distribution of heat flux q in each point of coordinates (x, y, z):…”

Section: Heat-source Modelmentioning

confidence: 99%

Experimental and numerical investigation of the weld repair of superplastic forming dies

Branza

Duchosal

Fras

et al. 2004

Journal of Materials Processing Technology

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“…Sabapathy et al (2003) and Wahab et al (2005) emphasized the importance of root pass in pipeline failure. First pass into the liner pipe results in a fine back surface inside the pipe and then other passes are conducted to fill the groove.…”

Section: Introductionmentioning

confidence: 99%

Optimization procedures for GMAW of bimetal pipes

Torbati

Miranda

Quintino³

et al. 2011

Journal of Materials Processing Technology

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“…In 2001, in a series of work by Sabapathy et al [7][8][9] developed a numerical procedure to predict failure during the 'in-service' welding of gas pipelines where a preliminary burn-through model of 'in-service' welding, using a non-linear thermal stress modeling was presented with an encouraging result. In their work, they presented a new mathematical description of the heat-source for manual metal arc (MMA) welding and some limited data related to temperature profile for the in-service welding.…”

Section: Introductionmentioning

confidence: 99%