SciELO - Scientific Electronic Library Online

vol.14 issue1Welding procedure effect on the properties of microalloyed steel welded joints for metal fabricationSelf-feed device behaviour valuation designed for assessment of operability of covered electrodes author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Soldagem & Inspeção

Print version ISSN 0104-9224On-line version ISSN 1980-6973


RAMOS MORALES, Félix et al. Necessary calorific energy, during the in-service welding of pipelines for petroleum transport. Soldag. insp. (Impr.) [online]. 2009, vol.14, n.1, pp.47-57. ISSN 0104-9224.

The thermal behavior during in service repair welding of oil transportation pipes was studied by finite element analysis in the present paper. Regression equations that relate peak temperature at the inner surface of the pipe and cooling time between 800 and 500ºC in the heat affected zone to the welding heat input, preheat temperature, and convection heat transfer coefficient were obtained. The former parameters govern, respectively, the possibility of burn through and cold cracking, and the latter parameters define the thermal behavior during welding. The existence of conditions that simultaneously satisfy the obtained equations, for different combinations of related variables, was proved. Graphical representations of relevant practical importance that were developed from the solution of obtained equations are presented.

Keywords : reparation; sleeves; burn through; cold cracking; finite elements.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License