Selection of Filler Materials to Minimize Preferential Weld Corrosion in Pipeline Steels

2010 ◽  
Author(s):  
Sudhakar P.V. Mahajanam ◽  
Michael W. Joosten
Keyword(s):  
Filler Materials ◽  
Pipeline Steels ◽  
Weld Corrosion ◽  
Selection Of

scholarly journals Solidification Cracking Assessment of LTT Filler Materials by Means of Varestraint Testing and µCT

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2726
Author(s):  
Florian Vollert ◽  
Maximilian Thomas ◽  
Arne Kromm ◽  
Jens Gibmeier
Keyword(s):  
Crack Depth ◽  
Hot Cracking ◽  
Filler Materials ◽  
Crack Network ◽  
Additional Information ◽  
Model Following ◽  
Hot Crack ◽  
Maximum Crack ◽  
Material Volume ◽  
Selection Of

Investigations of the weldability of metals often deal with hot cracking, as one of the most dreaded imperfections during weld fabrication. The hot cracking investigations presented in this paper were carried out as part of a study on the development of low transformation temperature (LTT) weld filler materials. These alloys allow to mitigate tensile residual stresses that usually arise during welding using conventional weld filler materials. By this means, higher fatigue strength and higher lifetimes of the weld can be achieved. However, LTT weld filler materials are for example, high-alloyed Cr/Ni steels that are susceptible to the formation of hot cracks. To assess hot cracking, we applied the standardized modified varestraint transvarestraint hot cracking test (MVT), which is well appropriate to evaluate different base or filler materials with regard to their hot cracking susceptibility. In order to consider the complete material volume for the assessment of hot cracking, we additionally applied microfocus X-ray computer tomography (µCT). It is shown that by a suitable selection of welding and MVT parameter the analysis of the complete 3D hot crack network can provide additional information with regard to the hot cracking model following Prokhorov. It is now possible to determine easy accessible substitute values (e.g., maximum crack depth) for the extent of the Brittleness Temperature Range (BTR) and the minimum critical strain P m i n .

The Essential Welding Variable Approach and its Application to the Welding of X80 Line Pipe Steels

2014 ◽  
Author(s):  
Yaoshan Chen ◽  
Jim Gianetto ◽  
Fateh Fazeli ◽  
Yongli Sui ◽  
Haicheng Jin
Keyword(s):  
Welding Parameters ◽  
Pipe Steels ◽  
Thermal Cycles ◽  
Pipeline Steels ◽  
Variable Approach ◽  
Weld Properties ◽  
Girth Welds ◽  
Welding Consumables ◽  
Pipe Materials ◽  
Selection Of

A weld quality control approach developed for the welding of high-strength pipeline steels has demonstrated its effectiveness in achieving reliability and consistency in the mechanical performance of girth welds. Using a predictive tool that can relate cooling times of welding thermal cycles with welding parameters and with the knowledge of microstructure responses of both pipe materials and weld metals to welding thermal cycles, the approach can evaluate the effects of welding parameters on weld properties and identify the essential welding variables. As a result, the essential welding variable approach can be used to optimize and help shorten the process of welding procedure development. The current paper presents the application of the essential welding variable approach to the girth welding of X80 pipeline steels. The application started with the selection of pipe materials, welding consumables, and candidate welding procedures. The selection of actual weld procedures and a welding matrix were made after the candidate welding procedures were analyzed in terms of cooling times. Girth welds for two X80 pipes of different chemical compositions, outside diameters, and wall thicknesses were made with single and dual torch GMAW-P processes and a range of welding consumables. The welding parameters were monitored and recorded for all welds; and the thermal cycles of selected welds were measured by thermocouples. Small-scale testing, including all-weld-metal tensile test, Charpy impact toughness and CTOD fracture toughness tests, were evaluated and correlated with microstructures formed in the HAZ of the girth welds. The material responses of heat-affected zone (HAZ) to thermal cycles of typical GMAW-P single and dual torch processes were experimentally simulated (Gleeble®). Detailed welding thermal cycle analyses were conducted based on the measured welding parameters. Cooling times of welding thermal cycles for the girth welds were calculated and correlated with the material responses, of X80 pipe steels to welding thermal cycles. The correlation demonstrated very good consistency between the cooling times, the results of the Gleeble simulation, and the mechanical properties of the girth welds. The dependency of the weld properties on welding parameters was analyzed in terms of cooling times, and the optimization strategy for development of welding procedures that offer more balanced welding properties between strength and toughness was evaluated by adjusting the essential welding variables. In summary, the process of applying the essential welding variable approach and the results from the tests and the analyses showed that the approach is capable of evaluating the effects of welding parameters on weld properties, identifying the essential welding variables, and ultimately optimizing welding procedures.

scholarly journals Welding supports of pins in mobile platforms

2020 ◽  
Vol 92 (4) ◽  
pp. 25-29
Author(s):  
Abilio Silva ◽  
Bożena Szczucka-Lasota ◽  
Tomasz Węgrzyn ◽  
Adam Jurek ◽  
Krzysztof Ireneusz Wilczyński
Keyword(s):  
Chemical Composition ◽  
Heat Affected Zone ◽  
High Strength ◽  
Welding Parameters ◽  
Filler Materials ◽  
Mobile Platforms ◽  
Varying Thickness ◽  
Welding Defects ◽  
Movable Platform ◽  
Selection Of

The demand for mixed joints of hard-welded steels used in civil engineering and transport is increasing. An example of this can be welding of pins of high-strength steel S690 QL (1.8928) with the arms of a movable platform made of DOCOL 1200M steel from the AHSS group. This joint is difficult to make properly, due to significant differences in the thickness of welded elements and different chemical composition of both steels. The thickness of the cylindrical pin is 40 mm, the diameter of the pin is 50 mm. The thickness of the metal sheet used for the mobile platform arm is 2 mm. . Joints of varying thickness and chemical composition may have cracks in the heat affected zone and in the weld. The purpose of the article is to determine the most appropriate welding parameters and the selection of filler materials that will allow to obtain the correct joint without welding defects.

Significant Alloy Elements in Welded Steel Structures of Car Body

2012 ◽  
Vol 57 (1) ◽  
pp. 45-52 ◽  
Author(s):  
T. Węgrzyn ◽  
R. Wieszała
Keyword(s):  
Steel Structure ◽  
Steel Structures ◽  
Filler Materials ◽  
Main Role ◽  
Welded Steel ◽  
Car Body ◽  
Welding Method ◽  
Welding Steel ◽  
Selection Of

Significant Alloy Elements in Welded Steel Structures of Car Body Structure, safety and exploitation conditions of welding steel in car body depend on many factors. The main role of that conditions is connected with car body material, welding technology, state of stress and temperature. Because of that, a good selection of steel and welding method is very important for proper steel structure. Low alloy steel is used for car body structure, very often with small amount of carbon and the amount of alloy elements such as Ni, Mn, Mo, Cr and V in car body and welded joints. Depending on the kind of steel which is used, a proper welding method and adequate filler materials should be applied. The present paper describes the influence of Mn, Ni, Mo, Cr, V in WMD (Weld Metal Deposit) on the behaviour of steel structure especially for low temperature service.

Repair Welding of Crane Wheels in Steelworks Smederevo

2016 ◽  
Vol 1138 ◽  
pp. 180-185 ◽  
Author(s):  
Drakče Tanasković ◽  
Branislav Đorđević ◽  
Mihajlo Aranđelović ◽  
Simon Sedmak ◽  
Aleksandar Sedmak ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Comparative Analysis ◽  
Economic Analysis ◽  
Filler Materials ◽  
Repair Welding ◽  
Repair Procedure ◽  
Crane Wheel ◽  
Selection Of ◽  
Repair Techniques

Comparative analysis of a repaired and a new crane wheel, was performed in Steelworks Smederevo, including an economic analysis and technological procedures. The repair procedure for a crane wheel is presented, along with the selection of filler materials, as well as testing of mechanical properties performed on samples taken from hard faced welds. The advantages of repair techniques compared to the manufacturing of a new wheel are shown, but also the flaws that may affect the worklife and integrity of wear-damaged elements and components.

Some Aspects on West-East Gas Transmission Pipeline Steels and Pipes

2002 ◽  
Author(s):  
Yaorong Feng ◽  
Chunyong Huo ◽  
Qiurong Ma ◽  
Helin Li
Keyword(s):  
General Situation ◽  
Operating Pressure ◽  
Pipeline Steels ◽  
Related Research ◽  
Transmission Pipeline ◽  
Pipeline Project ◽  
Fracture Control ◽  
Submerged Arc ◽  
Selection Of ◽  
Grade Steel

The general situation of West-East Gas Transmission Pipeline Project has been introduced. The selection of operating pressure, material grade, steel pipe type, microstructure and the fracture control of the pipeline have been discussed according to international gas pipeline developing trends and related research achievements. The research and production of X70 grade acicular ferrite pipeline steels and spiral submerged arc welded pipes have been introduced finally.

Thermal Conductivity and Contact Resistance Measurements for Adhesives

2007 ◽  
Author(s):  
Peter Teertstra
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Contact Resistance ◽  
Thermal Contact Resistance ◽  
Bulk Material ◽  
Thermal Contact ◽  
Filler Materials ◽  
Bonded Joint ◽  
Linear Fit ◽  
Selection Of

Thermal adhesives that contain large concentrations of high thermal conductivity filler materials, such as ceramics or metals, are widely used by the electronics industries in a variety of applications. The thermal properties of these materials, such as the thermal contact resistance across a bonded joint and the thermal conductivity of the bulk material, are critical to the selection of the “best” material. A method is presented for the measurement of these thermal properties using a steady-state, guarded heat flux meter test apparatus based on the well-documented and familiar ASTM test standard D-5470. Five different adhesive materials are tested and a linear fit of the resulting resistance versus thickness data are used to determine the bulk thermal conductivity and contact resistance values. Four of the five materials tested had conductivity values of less than 1 W/mK, and the data demonstrates that a small but significant thermal contact resistance exists between the adhesive and the substrate for each of the adhesives.

Study and Selection of the Most Appropriate Filler Materials for an Al/Cu Brazing Joint in Cooling Circuits

2011 ◽  
Vol 26 (2) ◽  
pp. 236-241 ◽  
Author(s):  
Carlos Berlanga-Labari ◽  
A. Albístur-Goñi ◽  
P. Balerdi-Azpilicueta ◽  
M. Gutiérrez-Peinado ◽  
J. Fernández-Carrasquilla
Keyword(s):  
Filler Materials ◽  
Selection Of

Cognitive gadgets and cognitive priors

2019 ◽  
Vol 42 ◽  
Author(s):  
Gian Domenico Iannetti ◽  
Giorgio Vallortigara
Keyword(s):  
Cognitive Neuroscience ◽  
Selection Of

Abstract Some of the foundations of Heyes’ radical reasoning seem to be based on a fractional selection of available evidence. Using an ethological perspective, we argue against Heyes’ rapid dismissal of innate cognitive instincts. Heyes’ use of fMRI studies of literacy to claim that culture assembles pieces of mental technology seems an example of incorrect reverse inferences and overlap theories pervasive in cognitive neuroscience.

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