Simulation of Wind Influence on the Thermal Processes in Gas-Shielded Welding

2014 ◽  
Vol 682 ◽  
pp. 91-95 ◽  
Author(s):  
Dmitry A. Chinakhov ◽  
A.V. Vorobyev ◽  
Yu.M. Gotovshchik
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Heat Affected Zone ◽  
Consumable Electrode ◽  
Thermal Processes ◽  
Shielding Gas ◽  
Thermal Fields ◽  
Wind Influence ◽  
Welding Processes

A set of various factors and phenomena defines the quality of welded joints. This is especially noticeable for outdoor welding. A numerical simulation of welding processes with consumable electrode with traditional and two-jet gas shielding was carried out to study the influence of wind speed on the movement of the shielding gas (CO2) and the change of thermal processes in the heat affected zone. It is established that the use of two-jet shielding in welding with a consumable electrode leads to an increase in hardness of the shielding gas stream and lower offset of thermal fields in the welded product in the wind direction. It testifies to a better quality of shielding and smaller probable changes in symmetry of structure formation and mechanical properties of the heat affected zone.

Effect of Laser Welding on the Mechanical Properties AISI 1018 Steel

MRS Advances ◽  
2017 ◽  
Vol 2 (64) ◽  
pp. 4031-4039 ◽  
Author(s):  
M. A. Carrizalez-Vazquez ◽  
M. Alvarez-Vera ◽  
A. Hernández-Rodríguez ◽  
J. M. Orona-Hinojos ◽  
Gabriel Sandoval-Vázquez ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Fusion Zone ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Laser Power ◽  
Steel Plates ◽  
Welding Joints ◽  
Welding Processes

AbstractLaser welding processes offer significant advantages such as high welding speed, narrow heat affected zone and quality of the welding joint. In this study, the process parameters of laser power and welding speed were modified for AISI 1018 steel plates of 8 mm thickness and compared using finite element method. The results of cross-section microstructure, heat affected zone and fusion zone were characterized. The grain refinement was affected as the parameters were modified. Tensile and microhardness tests were performed to determine the mechanical properties of the welding joints. Microhardness increased in fusion zone and decreased in heat affected zone. Tensile test showed ductile fracture in heat affected zone of the welding joints. The simulated profiles were compared with the experimental observations showing a reasonable agreement.

Study of Wind Velocity Impact upon the Quality of Shielding and upon the Thermal Processes under MAG Welding

2015 ◽  
Vol 770 ◽  
pp. 253-257
Author(s):  
Dmitry A. Chinakhov ◽  
A.V. Vorobyev ◽  
E.G. Grigorieva ◽  
E.I. Mayorova
Keyword(s):  
Wind Velocity ◽  
Gas Flow ◽  
Mag Welding ◽  
Thermal Processes ◽  
Shielding Gas ◽  
Thermal Fields ◽  
The Impact ◽  
The Given ◽  
Active Shielding

In the given paper we consider the impact of wind velocity upon the active shielding gas flow and changes of thermal processes in the MAG welding area. The authors completed numerical simulation of consumable electrode welding under traditional and two-jet gas shielding. It was established that application of two-jet gas shielding for MAG welding increases the hardness of the shielding gas jet and reduces wind-related displacement of thermal fields in the welded item. This ensures more qualitative shielding of the welding area under the windy conditions and uniform heat distribution in the welded item which leads to more homogeneous structure of weld and HAZ metal in comparison to the traditional (one-jet) gas shielding.

scholarly journals Research into special technological effects for formation of wear resistant coatings using mineral raw materials of the far eastern region

2018 ◽  
Vol 56 ◽  
pp. 03027
Author(s):  
Viktor Makienko ◽  
Igor Romanov ◽  
Pavel Sokolov ◽  
Alexander Atenyaev ◽  
Dmitry Pervakov
Keyword(s):  
Mechanical Properties ◽  
Raw Materials ◽  
Experimental Studies ◽  
Eastern Region ◽  
Mineral Raw Materials ◽  
Wear Resistant Coatings ◽  
Thermal Fields ◽  
Additional Influence ◽  
Far Eastern

The results of the study of the possibility of using additional technological influence in the formation of doped coatings are presented. The distribution of thermal fields has been calculated, which makes it possible to estimate and predict the influence of additional influence on the formation of the coating in a simplified manner. Experimental studies have shown that additional technological influence promotes mixing of the melt, leading to an increase in the transition of alloying elements, as well as an increase in the mechanical properties and quality of the weld metal.

scholarly journals Experimental Research and Numerical Simulation of Weld Repair with High Energy Spark Deposition Method

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 980 ◽  
Author(s):  
Yingjie Zhang ◽  
Kai Yang ◽  
Jianping Zhao
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Residual Stress ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
High Energy ◽  
Repair Welding ◽  
Repair Processes ◽  
Repair Technology ◽  
Surface Repair

For long-serviced pressure equipment that is under severe working conditions such as a high temperature, high pressure, and corrosion, the material properties and structure will be unavoidably damaged or degraded, especially cracks and other damages at key positions such as welded joints, which seriously threaten the safe operation of the equipment. In order to promote the sustainable development of industries such as the chemical and petrochemical industries, remanufacturing technology has emerged worldwide, and various surface repair processes have also rapidly developed. As an important branch of surface repair technology, the high energy spark deposition (HESD) process is a new pulse cold welding repair technology developed from electro-spark deposition, which combines the advantages of multiple surface repair processes. The HESD process has the characteristics of a smaller heat affected zone and lower welding residual stress. It is a new type of repair method that is worthy of popularization and application. The process has been initially applied in the fields of surface modification and die steel repair. In this paper, the application of the HESD process to the repair of welded joints was introduced, the mechanical properties of the joints and the residual stress distribution after welding were analyzed, and the feasibility of HESD as a repair welding method for pressure structures was discussed. First, a numerical simulation of the temperature and stress field of HESD was proposed by using ABAQUS and the related subprograms, and the validity of the simulation results was verified by the residual stress test with the indentation strain method. Due to the precise control of the heat and pulse discharge working mode, the heat-affected zone and deformation caused by the HESD were extremely small, and the residual stress that was generated was low and only concentrated on the repair welding seam. Second, according to the numerical simulation and the test results of the mechanical properties of the welded joint, the optimal repair welding process parameters were obtained through the orthogonal experiment: peak current 45 A, pulse width 90 ms, and output voltage 10 V.

Numerical simulation of air purging conditions during steel sheet temper rolling process

2017 ◽  
Vol 08 (01) ◽  
pp. 1750007 ◽  
Author(s):  
Siyu Dai ◽  
Yonglin Kang ◽  
Guoming Zhu ◽  
Xiaofei Zheng ◽  
Yuhui Wen
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Surface Quality ◽  
Working Conditions ◽  
Steel Sheet ◽  
Rolling Process ◽  
Simplified Model ◽  
Temper Rolling ◽  
Structured Grids

The application of the lubricant in the temper rolling process of tinplate manufacturing improves the mechanical properties and surface quality of the steel sheet. The removal of the residual lubricant deserves and has rarely been studied via numerical simulation. A simplified model of a single stand temper mill was established and was discretized into cells of block-structured grids. The criterion whether the lubricant could be removed was decided via multiphase simulation of a smaller model. Three parameters, the gap between the deflector and the rolls, the length of an additional baffle and the velocity of the purging air, were considered and scores of different working conditions were performed. The shapes of the steel sheet between the temper rolls and the bridle roll were also studied to screen out the conditions that the sheet could move steadily.

Microstructural evolution and properties of tungsten inert gas and fiber laser welded SUS445 ferritic stainless steel

2021 ◽  
Vol 112 (9) ◽  
pp. 687-694
Author(s):  
Ching-Wen Lu ◽  
Huei-Sen Wang ◽  
Chih-Chun Hsieh ◽  
Jie-Jyun Wu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Fiber Laser ◽  
Ferritic Stainless Steel ◽  
Heat Affected Zone ◽  
Volume Fraction ◽  
Inert Gas ◽  
Laves Phases ◽  
Welding Processes

Abstract To determine the weldability of SUS445 ferritic stainless steel, two welding approaches, tungsten inert gas and fiber laser welding processes, were used and compared. After the welding processes, the microstructure, mechanical properties, and corrosion resistance of the welds were investigated. In the weld fusion zones of these two welding approaches, different morphologies of the grains were obtained. No obvious precipitation formed in these zones. In the heat affected zone of the tungsten inert gas welds, more volume fraction and larger grain sizes of the Laves phase and larger matrix grains were observed, which significantly affected its corrosion resistance and mechanical properties. However, in the heat affected zone of the fiber laser welds, only small amounts Laves phases and a relatively narrow matrix grain growth area were observed, which offers better corrosion resistance and mechanical properties.

Shielding Gas: Performance Improvement of MIG and TIG Welding of Aluminum Alloys

2019 ◽  
Author(s):  
J.M. Fortain ◽  
S. Gadrey
Keyword(s):  
Surface Tension ◽  
Aluminum Alloys ◽  
Aluminium Alloy ◽  
Welded Joints ◽  
Filler Metal ◽  
Shielding Gas ◽  
Health Related ◽  
Convection Patterns ◽  
Welding Processes

Welded aluminium alloy products are widely used in the construction and packaging sectors: in this context, in order to be competitive, the welding processes must offer valid solutions from both the productivity and quality viewpoints in addition to health-related aspects with regard to welders and operators. In this context, the technological goals of Air Liquide have been focused on improving the quality of welded joints made using the MIG and TIG processes. The approach adopted here is to examine the various gas mixtures from the viewpoint of influence on electrical parameters (voltage), regularity of filler metal transfer, the surface tension of the melt bath and the convection patterns present in the latter.

Prediction of heat affected zone and other mechanical properties of welded joints of HSLA A588-B of jet blast deflector

2019 ◽  
Vol 16 (4) ◽  
pp. 438-444 ◽  
Author(s):  
Utkarsh Waghmare ◽  
A.S. Dhoble ◽  
Ravindra Taiwade ◽  
Jagesvar Verma ◽  
Himanshu Vashishtha
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Welding Process ◽  
High Strength ◽  
Generation Process ◽  
Content Type ◽  
Welding Processes ◽  
Scanning Electron

Purpose The purpose of this paper is to predict and optimize the width of heat affected zone (HAZ) with better mechanical properties using suitable welding process and parameters for the fabrication of jet blast deflector (JBD) (high strength low alloy material of grade A588-B was used for fabrication) so that the JBD can sustain high exhaust parameters, because there are different welding zones formed due to the rapid cooling of weld metals. Out of the various zones of welding, HAZ remains the weakest zone in the entire weldment. Design/methodology/approach The present work describes the modeling, simulation, Modeling of three-dimensional plate and mess generation process are carried out using ICEM CFD software. FLUENT 16.0 software is used for ANSYS simulation where various models are used for analysis and results are validated with the experimental outcomes. High strength low alloy plates are welded by using shielded metal arc welding and tungsten inert gas (TIG) welding processes with two different electrodes. Optical microscopy and scanning electron microscopy were used for metallurgical study. The mechanical properties were evaluated by tensile strength test, vickers microhardness test and impact test. The corrosion resistance was evaluated by performing the potentiodynamic polarization test. Findings The present study indicated for better mechanical properties and improved corrosion resistance for TIG welded joints with type 308 L filler. Practical implications In aeronautical, defense, space and research organizations. Originality/value It can be shown from the scanning electron microscope technique that sound weld joint is produced with very good mechanical properties and joint also showed better corrosion resistance.

Impact of Metallurgical Size Effects on Plasticity of Thin Metallic Materials

2014 ◽  
Vol 783-786 ◽  
pp. 2290-2295
Author(s):  
Eric Hug ◽  
Clément Keller ◽  
Anne Marie Habraken
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Grain Size ◽  
Size Effects ◽  
Moderate Increase ◽  
Metallic Materials ◽  
Softening Effect ◽  
Final Shape ◽  
Thin Wires

Three examples involving size effects are presented with implications concerning the formability: small Ni-20wt.%Cr resistive bridges, magnetic micro-sensors performed with (Ni, Co, Fe) based alloys and copper clad aluminum thin wires. The mechanical properties are directly linked to the ratio thickness over grain size (t/d ratio) of the parts. These metallurgical considerations must be taken into account when we are concerned by the numerical simulation of the process of such components. It is shown that the simulations can correctly reproduce the softening effect linked to a decrease in thickness and in number of grains across the thickness: the quality of the final shape strongly depends on the number of grains across the thickness. Finally the effect of a moderate increase in temperature on these results will be briefly reported.

scholarly journals Welding Capabilities of Nanostructured Carbide-Free Bainite: Review of Welding Methods, Materials, Problems, and Perspectives

2019 ◽  
Vol 9 (18) ◽  
pp. 3798 ◽  
Author(s):  
Aleksandra Królicka ◽  
Andrzej Ambroziak ◽  
Andrzej Żak
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Process Parameters ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
State Of The Art ◽  
High Carbon ◽  
Weld Metals ◽  
Temperature Heat ◽  
Welding Processes

This article presents state-of-the-art welding methods and the weldability aspect of steels, particularly high-carbon nanobainitic (NB) steels, without carbide precipitates (CFB—carbide-free bainite). On the basis of research conducted to date, all welding methods with parameters and weld metals for NB CFB are presented. It was found that the process parameters significantly affected the mechanical properties of the welds, which were determined primarily by the properties of the low-temperature heat-affected zone. The microstructures of welded joints in the heat-affected and fusion zones are also described. The general requirements for welding processes, as well as problems and perspectives for further research, are presented.

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