scholarly journals Experimental Study of the Distribution of Temperature Fields in the Butt Contour of a Welded Joint Made of Carbon and High-Alloy Structural Steels

2021 ◽  
Vol 346 ◽  
pp. 01012
Author(s):  
Lubov Mironova ◽  
Ruclan Nigay ◽  
Evgenij Nigay
Keyword(s):  
Analytical Method ◽  
Arc Welding ◽  
Welded Joint ◽  
Structural Steels ◽  
Reference Points ◽  
Temperature Fields ◽  
High Alloy ◽  
Temperature Stresses ◽  
Thin Walled Tube ◽  
Electric Arc Welding

A graphic-analytical method for determining temperature fields in the butt contour of a welded joint of a thin-walled tube with a base is presented. The method is based on the experimental data of temperature measurement at the reference points of the structure. The features of the elements of the welded joint made of carbon and high-alloy structural steels and the modes of electric arc welding were taken into account. A graphic-analytical method for determining temperature fields is proposed, which, on the basis of the theory of welding strains and stresses, makes it possible to determine temperature stresses and strains, both in the elements of the joint and in the contour of the weld.

Experimental and Computational Method for Determining Temperature Stresses in the Welding of Structures Made of Carbon and High-Alloy Structural Steels

2021 ◽  
Vol 1037 ◽  
pp. 343-348
Author(s):  
Lubov Mironova ◽  
Ruslan Nigay ◽  
Evgeny Nigay
Keyword(s):  
Experimental Data ◽  
Welded Joint ◽  
Spline Approximation ◽  
Numerical Differentiation ◽  
Structural Steels ◽  
Reference Points ◽  
Computational Method ◽  
Temperature Fields ◽  
High Alloy ◽  
Temperature Stresses

A method for determining temperature stresses in a welded joint of a thin-walled pipe with a base is described. The method is based on experimental data of temperature measurement at reference points of the structure. The features of the elements of the welded joint made of carbon and high-alloy structural steels and the modes of electric arc welding were taken into account. The efficiency of using spline approximation of experimental data to obtain analytical dependences of the distribution of temperature fields and stresses, as well as to obtain a solution of the heat equation by numerical differentiation and integration for this case, is shown. Formulas for calculating temperature stresses for the case of an asymmetric temperature distribution in a cylinder under the action of a moving high-intensity heat source are obtained.

scholarly journals Methodology for the Study of Residual Temperature Stresses in the Butt Contour of a Welded Joint Made of Carbon and High-Alloy Structural Steels during Multi-Pass Welding

2022 ◽  
Author(s):  
L. Mironova
Keyword(s):  
Welded Joint ◽  
Structural Steels ◽  
Reference Points ◽  
High Alloy ◽  
Temperature Stresses ◽  
Welding Technology ◽  
Temperature Problem ◽  
Residual Temperature ◽  
Energy Theory ◽  
Shell Plate

Abstract. The method of investigation of residual temperature stresses in the butt contour of the welded joint "shell – plate" made of carbon and high-alloy structural steels during multi-pass welding is described. The temperature problem was solved on the basis of the obtained experimental data of temperature measurement at the reference points of the structure during the application of the rollers. A solution is proposed that takes into account several stages, each of which corresponds to a specific intermediate temperature field due to the peculiarities of welding technology. The evaluation of residual stresses was carried out on the basis of the energy theory of plasticity, taking into account the dependences of the yield strength and elastic modulus of welded metals on temperature.

Microstructure and Wearability of Surface Coating of Fe-Based Amorphous Core Welding Rod

2010 ◽  
Vol 154-155 ◽  
pp. 1384-1388
Author(s):  
Bin Wang ◽  
Zhen Yang ◽  
Dong Mei Zhou ◽  
Pei Shan Zhou
Keyword(s):  
Amorphous Alloy ◽  
Surface Coating ◽  
Arc Welding ◽  
Welded Joint ◽  
Coating Layer ◽  
Amorphous State ◽  
Electric Arc ◽  
Metallographic Analysis ◽  
Electric Arc Welding ◽  
Better Than

Based on the classic formula of J507 coated electrode，the welding rods were prepared by adding Fe41Co7Cr15Mo14C15B6Y2 Fe-based amorphous alloy or HO8A as welding core. The surface coating on Q235 was made by manual electric arc welding with two kinds of welding rods,while Ar2 gas is used to cool the weld layer. The microstructure and wearability of welded joint and the coating layer were investigated by the means of metallographic analysis, SEM,XRD and M-2000 wear tester.The results show that the coating layer is in the amorphous state,and the wearability of surface coating with Fe-based amorphous core welding rod is better than another.

Modeling of Heat Transfer in Pipeline Steel Joint Performed by Submerged Double-Arc Welding Procedure

2013 ◽  
Vol 814 ◽  
pp. 33-40 ◽  
Author(s):  
Dan Catalin Birsan ◽  
Elena Scutelnicu ◽  
Daniel Visan
Keyword(s):  
Heat Transfer ◽  
Arc Welding ◽  
Welded Joint ◽  
Pipeline Steel ◽  
Welding Process ◽  
Temperature Fields ◽  
Welding Procedure ◽  
Thermal Sources ◽  
Submerged Arc ◽  
Process Productivity

Submerged arc welding is the most applicable and productive procedure when thick sections have to be welded. Nevertheless, the manufacturers of pressure vessels, pipelines, ships and offshore structures keep on looking for new and modern design solutions of equipments and technologies which should lead to increase of welding process productivity. For instance, the longitudinal welds of pipelines are, mostly, performed by submerged arc welding procedure with multiple arcs and/or multi-wires, such as twin, tandem or twin-tandem, in order to increase the process productivity. However, achievement of optimal mechanical properties of the welded joint should remain the most important quality criteria. It is well known that dependence of the mechanical and metallurgical changes on heat transfer plays a major role in obtaining of safe welded structures and preserving of their structural integrity. That is why the investigation of heat transfer induced by the welding process is required. Furthermore, setting of distance between thermal sources and its influence on the overlapping phenomenon of temperature fields should be explored when submerged double-arc welding procedure is applied. Three dimensional finite element model of butt welded joint - used for simulation of heat transfer in pipeline steel joint performed by submerged double-arc welding process - is developed and described in this paper. Numerical results and a comparative analysis related to the temperature distribution, thermal history, and temperature variation in cross section of the welded joint at different time steps are discussed. Finally, important conclusions regarding the influence of distance between thermal sources on thermal effects and temperature fields overlapping are drawn.

Electric arc welding and surfacing in repair of rails of Kyiv underground

2018 ◽  
Vol 2018 (2) ◽  
pp. 30-33
Author(s):  
G.V. Kuzmenko ◽  
◽  
V.M. Taganovsky ◽  
V.L. Sidorenko ◽  
◽  
...  
Keyword(s):  
Arc Welding ◽  
Electric Arc ◽  
Electric Arc Welding

scholarly journals The influence of manual metal arc multiple repair welding of long operated waterwall on the structure and hardness of the heat affected zone of welded joints

2017 ◽  
Vol 62 (1) ◽  
pp. 327-333 ◽  
Author(s):  
J. Pikuła ◽  
M. Łomozik ◽  
T. Pfeifer
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Arc Welding ◽  
Power Plants ◽  
Welded Joint ◽  
Weld Bead ◽  
Boiler Steel ◽  
Metallographic Examination ◽  
Metal Arc Welding ◽  
High Degree

Abstract Welded installations failures of power plants, which are often result from a high degree of wear, requires suitable repairs. In the case of cracks formed in the weld bead of waterwall, weld bead is removed and new welded joint is prepared. However, it is associated with consecutive thermal cycles, which affect properties of heat affected zone of welded joint. This study presents the influence of multiple manual metal arc welding associated with repair activities of long operated waterwall of boiler steel on properties of repair welded joints. The work contains the results of macro and microscopic metallographic examination as well as the results of hardness measurements.

Data Mining for ERW Welded Tube Scheduling Rules Based on Decision Tree

2011 ◽  
Vol 403-408 ◽  
pp. 1804-1807
Author(s):  
Ning Zhao ◽  
Shao Hua Dong ◽  
Qing Tian
Keyword(s):  
Data Mining ◽  
Decision Tree ◽  
Arc Welding ◽  
Data Cleaning ◽  
Data Extraction ◽  
Electric Arc ◽  
Welded Tube ◽  
Electric Arc Welding ◽  
Decision Tree Method ◽  
Tree Method

In order to optimize electric- arc welding （ERW） welded tube scheduling , the paper introduces data cleaning, data extraction and transformation in detail and defines the datasets of sample attribute, which is based on analysis of production process of ERW welded tube. Furthermore, Decision-Tree method is adopted to achieve data mining and summarize scheduling rules which are validated by an example.

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