DETERMINATION OF THE BEHAVIOR OF 6063 ALUMINUM IN THE FRICTION WELDING PROCESS USING MATHEMATICAL MODELS

2012 ◽  
Vol 1381 ◽  
Author(s):  
F. García ◽  
P. del C. Zambrano Robledo ◽  
M.P. Guerrero ◽  
F. García-Vazquez
Keyword(s):  
Mechanical Strength ◽  
Mathematical Models ◽  
Strain Rate ◽  
Friction Welding ◽  
Welded Joint ◽  
Welding Process ◽  
Plastic Model ◽  
Rate Dependent ◽  
Ideal Process

AbstractIn this work, it was used a Johnson-Cook elastic-plastic model to represent the behavior in the friction welding process of 6063 aluminum. Temperature and strain rate dependent laws were used to determine the behavior of the material. The results determined that the amount of heat transferred into the material dictates the quality and the microstructure of the welding and the mechanical strength of the welded joint in an ideal process.

Determination of Strain Rate Depended Stress and Strain Fields in PVD Coatings on Cemented Carbide Inserts during the Repetitive Impact Test

2020 ◽  
Vol 404 ◽  
pp. 45-52
Author(s):  
Antonios Bouzakis ◽  
Georgios Skordaris ◽  
Konstantinos Dionysios Bouzakis ◽  
Mehmet Gökhan Gökcen ◽  
Apostolos Boumpakis ◽  
...  
Keyword(s):  
Strain Rate ◽  
Cemented Carbide ◽  
Stress And Strain ◽  
Strain Fields ◽  
Rate Dependent ◽  
Impact Forces ◽  
Repetitive Impact ◽  
Carbide Inserts ◽  
Fatigue Endurance

Recently, stress, strain, strain-rate dependent curves for cemented carbide have become an established tool for evaluating the mechanical properties. In this paper, related strain-rate dependent data of a K05 insert were employed to define the developed stress and strain fields occurring in the compound coating-substrate at impact forces of various durations. In this way, the occurring maximum strains at various impact loads and times were analytically calculated. These maximum values and related fatigue endurance coating strain-rate dependent limits were consequently used to validate published coating fatigue critical impact forces associated with certain impact times.

Velocity of Torsional Waves in Metals Stressed Statically into the Plastic Range

1968 ◽  
Vol 10 (2) ◽  
pp. 153-164 ◽  
Author(s):  
E. Convery ◽  
H. LI. D. Pugh
Keyword(s):  
Strain Rate ◽  
Strain Curve ◽  
Plastic Range ◽  
Stress Strain Curve ◽  
Rate Dependent ◽  
Torsional Waves ◽  
Dependent Theory ◽  
Velocity Of Propagation ◽  
Elastic Shear

This paper is concerned with the determination of the velocity of propagation of torsional plastic waves in metals stressed statically into the plastic range. A new method was developed in which a tubular test specimen together with a concentric bar of a brittle material was twisted slowly such that when the specimen was stressed beyond its yield the brittle bar broke suddenly and transmitted a plastic torsional stress increment along the specimen. It was found that the velocity of propagation both in copper and mild steel was the same as the elastic shear wave velocity. Although consistent with the strain-rate dependent theory, the result can be explained in terms of the strain-rate independent theory provided the stress-strain curve for the appropiate strain rate is used.

Residual Stresses Evaluation on Radial Friction Welded Joints

2005 ◽  
Author(s):  
Rosa Irene Terra Pinto ◽  
Telmo Roberto Strohaecker
Keyword(s):  
Residual Stresses ◽  
Friction Welding ◽  
Deformation Gradient ◽  
Welding Process ◽  
Hole Drilling ◽  
Welding Parameters ◽  
Hole Drilling Method ◽  
Joint Quality ◽  
Welding Processes

The Radial Friction Welding (RFW) is a solid-state welding process in which two long elements of several metallic alloys can be joined, without the occurrence of common problems to the conventional welding processes that include fusion. During friction welding the temperature evolution is directly related with the deformation gradient, and these fields govern the joint properties. In this work, the finite element method was used to solve the full coupled termomechanical problem in order to determine the deformation and the stress fields and the variation of the temperature during RFW process. The simulation of the RFW process permitted to establish the influence of the welding parameters, like rotation and approximation speed, on the joint quality. Furthermore, the knowledge of the temperature gradient and cooling rates allowed the prediction of the resulting microestruture and determination of the level of residual stresses of the joint. To verify the analytical results the determination of the residual stresses was accomplished by the hole drilling method in several points along the perimeter of two welded workpieces.

scholarly journals Determination of emission of iron oxides from the welding process on the basis of mathematical models

2021 ◽  
Vol 93 (2) ◽  
pp. 35-42
Author(s):  
Jarosław Mikołajczyk ◽  
Karolina Pikulik
Keyword(s):  
Mathematical Models ◽  
Iron Oxides ◽  
Welding Process ◽  
Welding Current ◽  
Test Results ◽  
Negative Effects ◽  
Average Value ◽  
Harmful Emission ◽  
R Program

Oxygen in metals is most often present in the form of oxides, including: FeO, Fe2O3, Fe3O4. The complexity of the welding process means that oxygen compounds can enter both the liquid metal and the atmosphere, causing negative effects. A welder is exposed to harmful emission of oxides entering the human body through the respiratory system or pores in the skin. The essence of the problem is so serious that standards for air purity and determination of amount of oxides at workplaces have been introduced. The article presents the results of research on the influence of the welding current intensity on the emission of air pollutants (in particular the emission of iron oxides) of the inhalable and respirable fractions. The bench tests were carried out on the basis of the applicable standards for air quality at welding stations. Based on the test results, on the basis of the R program, mathematical models of the emission of iron oxides generated during the welding process were developed. It was observed that with the increase of the welding current, the average value of the emission of iron oxides – both the inhalable and respirable fractions – increases. For both fractions, it was also noted that the model values ​​are closer to the values measured in the model No. 1.

Determination of Mechanical Properties for Microhardness Mapping in a 5052 Aluminum Alloy Welded by Mig Process

2018 ◽  
Vol 930 ◽  
pp. 356-361
Author(s):  
José Costa de Macêdo Neto ◽  
Juarez Viégas Silva ◽  
Guilherme dos Santos Moreira ◽  
João Evangelista Neto ◽  
Flavio Silveira ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Tensile Test ◽  
Mechanical Strength ◽  
Optical Microscopy ◽  
Weld Pool ◽  
Gas Flow ◽  
Filler Metal ◽  
Welded Joint ◽  
Transfer Mode

Aluminum alloys are widely used in shipbuilding, it is a material with good mechanical strength, high corrosion resistance and good conformation. In this study we used the filler metal 5183 aluminum alloy, groove angle 80°, root opening 0,5mm, stick-out 12 a 14mm, voltage 23V, torch 99,99%Ar, transfer mode Pulsed, current 220A, wire speed 30cm/min, gas flow 25l/min. The aim of this study was to research the mechanical strength in a welded joint naval 5052 aluminum alloy welded by Metal Inert Gas-MIG process using a mapping microhardness and software images. They were also carried out the tensile test, chemical analysis of the studied alloy and optical microscopy. The results of microhardness showed that the weld pool showed lower values. Optical microscopy showed that the weld pool had bubbles and the tensile test was presented fracture in the welded joint.

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