scholarly journals Physical Mechanisms and Mathematical Models of Bead Defects Formation During Arc Welding

Arc Welding ◽  
10.5772/30803 ◽  
2011 ◽  
Author(s):  
Wladislav Sudnik
Keyword(s):  
Mathematical Models ◽  
Arc Welding ◽  
Physical Mechanisms

Mathematical models of transport phenomena associated with arc-welding processes: a survey

1994 ◽  
Vol 2 (5) ◽  
pp. 995-1016 ◽  
Author(s):  
P G Jönsson ◽  
J Szekely ◽  
R T C Choo ◽  
T P Quinn
Keyword(s):  
Mathematical Models ◽  
Arc Welding ◽  
Transport Phenomena ◽  
Welding Processes

Physical mechanisms of fluid flow and joint inhomogeneity in variable-polarity plasma arc welding of thick aluminum alloy plates

2021 ◽  
Vol 33 (8) ◽  
pp. 087103
Author(s):  
Bin Xu ◽  
Shinichi Tashiro ◽  
Manabu Tanaka ◽  
Fan Jiang ◽  
Shujun Chen
Keyword(s):  
Aluminum Alloy ◽  
Fluid Flow ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Physical Mechanisms ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc

Modified Mathematical Models for Melting Rate in Submerged Arc Welding

2007 ◽  
Vol 40 (4) ◽  
pp. 21 ◽  
Author(s):  
Abhay Sharma ◽  
Navneet Arora ◽  
Bhanu K. Mishra
Keyword(s):  
Mathematical Models ◽  
Arc Welding ◽  
Melting Rate ◽  
Submerged Arc Welding ◽  
Submerged Arc

scholarly journals MEASURING THE PROCESS EFFICIENCY OF CONTROLLED WELDING PROCESSES

2012 ◽  
pp. 248-254
Author(s):  
M. SAQUIB ANWAR ◽  
S P UNTAWALE
Keyword(s):  
Mathematical Models ◽  
Liquid Nitrogen ◽  
Arc Welding ◽  
Process Efficiency ◽  
Transfer Processes ◽  
Welding Processes

This The process efficiency in Seem and Arc Welding is a crucial input to Mathematical models of the process and requires the use of an accurate welding calorimeter. In this paper we compare a liquid nitrogen calorimeter with an insulated box calorimeter for measuring the process efficiency of Fronius CMT, Lincoln STT and Rapid Arc, Kemppi FastRoot and standard pulsed GMAW. All the controlled dip transfer processes had a process efficiency of around 85% when measured with the liquid nitrogen calorimeter.

scholarly journals The Tree-Level Viscoelastic Model: Analysis of the Influence of the Packing Defect Energy to the Response of Materials under Complex Loading

2020 ◽  
pp. 60-73
Author(s):  
D. S Gribov ◽  
P. V Trusov
Keyword(s):  
Mathematical Models ◽  
Solid Mechanics ◽  
Kinetic Equations ◽  
Complex Loading ◽  
Metals And Alloys ◽  
Tree Level ◽  
Slip Systems ◽  
Complex Deformation ◽  
Physical Mechanisms ◽  
Dislocation Densities

The development of new and improvement of existing modes of thermomechanical treatment of metals and alloys in present conditions is impossible without development of appropriate mathematical models, that allow determining material characteristics during technological processes. Constitutive equations are the core, the main components that determine the quality of such models. Macrophenomenological theories of plasticity relying on processing the results of experiments on macrosamples, have become widespread as such in solving applied problems of solid mechanics. Taking into account the need to describe the memory of processes, the equations of this class have a complicated mathematical structure, require expensive tests (generally speaking, for complex loading) for each material, due to which they are not universal. In the past 15-20 years, constitutive models based on the introduction of internal state variables, of a multilevel approach, and physical theories of inelasticity (plasticity, viscoplasticity) became very popular. Models of this class are focused on describing the evolving structure (including microstructure), which ultimately determines the physical and mechanical properties of materials and constructions. As the physical mechanisms and their carriers are identical for wide classes of materials, the models of this class have significant versatility, including the prediction of behavior of new, not yet existing materials, to study the physical mechanisms of the occurrence of various effects, observed in macro experiments. Hardening is one of interesting effects observed in experiments on complex (including cyclic) loading (as compared to directional loading) of samples, made of various metals and alloys, arising from a significant evolution of the microstructure. Empirical data analysis made it possible to establish that the tendency to manifest this effect is usually experienced by metals and alloys with a low stacking fault energy (SFE). The paper provides a brief analysis of the experimental work and mathematical models describing the response of a material to complex deformation. It is noted that macrophenomenological theories do not allow one to describe in an explicit form the evolution of the microstructure and the carriers of plastic deformation and hardening mechanisms, thus they do not provide an opportunity to explain the physical reasons for the above effects. The purpose of this work is to develop, study and implement a multilevel elasto-visco-plastic model that allows describing the evolution of crystal lattice defects in materials with different SFE under different thermomechanical processing, different strengthening mechanisms at different structural-scale levels. In the framework of constructing a constitutive model, special attention is paid to the development of a submodel, focused on description of the evolution dislocations and barrier densities on slip systems. Kinetic equations for dislocation densities on slip systems make it possible to analyze the nucleation of dislocations due to the activation of Frank - Read sources, annihilation of dislocations of different signs on one slip system, interaction of split dislocations of intersecting slip systems with the formation of barriers. Relations for the description of hardening are given, taking into account the current density of dislocations and barriers. The general structure of the model and the relationship between the parameters of submodels of different levels are considered. An algorithm and a program of implementing the model were developed, the evolution of dislocation densities on slip systems was analyzed, and the intensity of hardening and the formation of barriers on split dislocations were obtained depending on the type of loading.

Appication of the Complete Material Balance Method to Estimate the Transition of Elements in Flux Cored Arc Welding

2020 ◽  
Vol 299 ◽  
pp. 559-564 ◽  
Author(s):  
M.P. Shalimov ◽  
E.B. Votinova
Keyword(s):  
Comparative Analysis ◽  
Weld Metal ◽  
Mathematical Models ◽  
Arc Welding ◽  
Material Balance ◽  
Cored Wire ◽  
Flux Cored Arc Welding ◽  
Manual Arc Welding ◽  
Material Balance Method ◽  
Coated Electrodes

The paper addresses mathematical models of element transition into overlaying metal and weld metal in different methods of arc welding: stir welding, welding taking account the transition coefficients, empirical, kinetic, and thermodynamic welding. Their comparative analysis is made, their advantages, disadvantages, as well as various applications, are demonstrated. The approach to creation of mathematical models of manual arc welding with coated electrodes and flux cored wire, based on the method of complete material balance, is grounded.

Strain analysis with nanometer resolution using a conventional transmission electron microsopy technique: electron diffraction contrast imaging revisited

1995 ◽  
Vol 53 ◽  
pp. 168-169
Author(s):  
Koenraad G F Janssens ◽  
Omer Van der Biest ◽  
Jan Vanhellemont ◽  
Herman E Maes ◽  
Robert Hull
Keyword(s):  
Electron Diffraction ◽  
Strain Field ◽  
Elastic Strain ◽  
Strain Analysis ◽  
Local Strain ◽  
Contrast Imaging ◽  
Strain Characterization ◽  
Physical Mechanisms ◽  
Diffraction Contrast ◽  
Transmission Electron

There is a growing need for elastic strain characterization techniques with submicrometer resolution in several engineering technologies. In advanced material science and engineering the quantitative knowledge of elastic strain, e.g. at small particles or fibers in reinforced composite materials, can lead to a better understanding of the underlying physical mechanisms and thus to an optimization of material production processes. In advanced semiconductor processing and technology, the current size of micro-electronic devices requires an increasing effort in the analysis and characterization of localized strain. More than 30 years have passed since electron diffraction contrast imaging (EDCI) was used for the first time to analyse the local strain field in and around small coherent precipitates1. In later stages the same technique was used to identify straight dislocations by simulating the EDCI contrast resulting from the strain field of a dislocation and comparing it with experimental observations. Since then the technique was developed further by a small number of researchers, most of whom programmed their own dedicated algorithms to solve the problem of EDCI image simulation for the particular problem they were studying at the time.

Arc welding

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2015 ◽  
Keyword(s):  
Arc Welding
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