Multifactor mathematical model of criticality of welding process of products from aluminum- magnesium alloys

2020 ◽  
pp. 12-18
Author(s):  
F.A. Urazbahtin ◽  
A.YU. Urazbahtina
Keyword(s):  
Mathematical Model ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Welding Process ◽  
Welding Equipment ◽  
Equipment Operation ◽  
Aluminum Magnesium Alloys ◽  
Aluminum Magnesium Alloy ◽  
Welding Materials

A multifactor mathematical model of the welding process of products from aluminum-magnesium alloys, consisting of 71 indicators that assess the quality of the weld, the welding process, costs, equipment operation and quality of the welded material. The model can be used to control and optimize the welding process of products from aluminum-magnesium alloys. Keywords welding, products, aluminum-magnesium alloy, indicators, process parameters, welding equipment, welding materials, electrode sharpening, lining [email protected]

scholarly journals RESEARCH OF PLASMA SPRAYING PROCESS ON ALUMINUM-MAGNESIUM ALLOY / ALIUMINIO-MAGNIO LYDINIO PLAZMINIO PURŠKIMO PROCESO TYRIMAS

2016 ◽  
Vol 7 (6) ◽  
pp. 619-623
Author(s):  
Patricija Kavaliauskaitė ◽  
Raimonda Lukauskaitė ◽  
Gerda Vaitkūnaitė ◽  
Jelena Škamat
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Plasma Spray ◽  
Mechanical Treatment ◽  
Micro Hardness ◽  
Aluminum Magnesium Alloys ◽  
Plasma Sprayed ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Aluminum Magnesium Alloy

The article examines plasma sprayed 95Ni-5Al coatings on alu-minum-magnesium (Mg ≈ 2,6‒3,6 %) alloy substrate. Alumi-num-magnesium samples prior spraying were prepared with mechanical treatment (blasting with Al2O3). 95Ni-5Al coatings on aluminum-magnesium alloys were sprayed with different parameters of process and coating‘s thickness, porosity, micro-hardness and microstructure were evaluated. Also numerical simulations in electric and magnetic phenomena of plasma spray-ing were carried out. Straipsnyje nagrinėjamos plazminiu būdu užpurkštos 95Ni-5Al dangos ant aliuminio-magnio (Mg ≈ 2,6–3,6 %) lydinio substrato. Aliuminio-magnio substratų paviršiai prieš purškimą buvo apdorojami mechaniniu apdorojimo būdu (srautinimas Al2O3 dalelėmis). Naudojant skirtingus plazminio purškimo proceso parametrus, buvo užpurkštos nikelio-aliuminio dangos ant aliuminio-magnio lydinių. Nustatytas užpurkštų dangų storis, akytumas ir mikrokietis. Buvo atlikta užpurkštos 95Ni-5Al dangos mikrostruktūros analizė. Darbe taip pat atliktas plazminio purškimo elektrinių ir magnetinių reiškinių skaitinis modeliavimas.

scholarly journals Contributions Regarding the Use of Mechanical Vibrations in Order to Improve the Properties of Steels and Welded Joints Used in Metal Constructions

2020 ◽  
Vol 21 (2) ◽  
pp. 67-71
Author(s):  
Gheorghe Novac ◽  
Bogdan Novac
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Significant Contribution ◽  
Welding Process ◽  
Internal Stresses ◽  
Welding Equipment ◽  
Welding Technology ◽  
Submerged Arc ◽  
Very High

The paper presents aspects regarding the influence of vibrations on the mechanical properties of welded joints, made with basic materials of Spanish and Romanian origin. In this research is presented the practical way to make the necessary assemblies for the proposed tests. The tests show that vibrations have a significant contribution to the quality of welded joints. This is explained by the appearance of several crystallization centres which makes the structure finer. By using vibrations, the atoms are rearranged in the structure, ensuring a proper de-tensioning. The stresses induced in welded metals are significantly reduced by the use of vibration during welding process. The addition materials have a significant contribution to the emergence of stresses in welded joints as well. These stresses can contribute to the appearance of microstructural constituents with significant hardness. The welding equipment and technologies used also have a significant contribution to the emergence of the remaining stresses. For example, the submerged arc welding technology (SAF) can introduce very high internal stresses. By using vibrations during the welding process, it is achieved a fine structure and a significant reduction of remaining stresses in the welded joints.

The Influence of Burnishing Parameters on the Surface Quality of Bars Made from AZ61 Magnesium Alloy

2013 ◽  
Vol 837 ◽  
pp. 135-140
Author(s):  
Gheorghe Mustea ◽  
Gheorghe Brabie
Keyword(s):  
Magnesium Alloy ◽  
Surface Quality ◽  
Magnesium Alloys ◽  
Working Process ◽  
Turning Operation ◽  
Az61 Magnesium Alloy ◽  
Burnishing Process ◽  
Abrasive Tools ◽  
Machined Surfaces

In the machining of the magnesium and magnesium alloys, some difficulties are encountered during working process. Thus, in the case of turning operation, when phenomena like: splinter self-ignition and flank built-up occur during machining, special tools and coolants are required in order to diminish the effects of such phenomena. In the case of grinding operation of the magnesium and its alloys, other phenomena like: adhesion between the abrasive tools and processing materials can cause explosions and hence such operation must be conducted in special conditions. A solution that can be applied to avoid such phenomena and effects is represented by the utilization of the burnishing operation. In the present study, the influence of the burnishing process on the quality of the machined surfaces of parts made from AZ61 magnesium alloy was performed. The quality of the burnished surfaces was analyzed in terms of the roughness and hardness parameters, the parameters with the greatest influence on surfaces roughness and hardness being the burnishing feed, burnishing speed and burnishing pressure

Fast Electroless Ni-P Coating on AM60 Magnesium Alloy at Low Bath Temperature

2011 ◽  
Vol 418-420 ◽  
pp. 756-759 ◽  
Author(s):  
Guo Bing Mao
Keyword(s):  
Growth Rate ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Electroless Plating ◽  
Corrosion Test ◽  
Bath Temperature ◽  
Test Results ◽  
Electroless Ni

The Ni-P coatings were deposited on AM60 magnesium alloy by electroless plating process without or with accelerators. Without accelerators, the deposition rate is slow and required high bath temperature to obtain compact coating. There have many defects on the surface of the Ni-P coatings which deposited at high bath temperature. The composite accelerators were introduced into the bath for improving the growth rate and the quality of the Ni-P coating. Uniform, with no pores or cracks, “cauliflower-like” structure and complete Ni-P coatings were deposited only taken 20 min with additives at low bath temperature. The XRD result indicates that the structure of the Ni-P coating is amorphous nickel. The corrosion test results indicated that the corrosion resistance of this coated AM60 magnesium alloys increases distinctly as compared to bare alloys.

Kiss-Point Position Control of Solidification Layer and Process Optimization for Twin-Roll Casting of Magnesium Alloys

2011 ◽  
Vol 189-193 ◽  
pp. 3844-3851
Author(s):  
Wen Ping Weng ◽  
Kang Deng ◽  
Zhong Ming Ren ◽  
Qi Chen ◽  
Zhi Dong Chi ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Process Optimization ◽  
Strip Thickness ◽  
Alloy Strip ◽  
Roll Speed ◽  
Twin Roll Casting ◽  
Roll Casting ◽  
Twin Roll

The solidification and process optimization for twin-roll casting of magnesium alloys have been studied. Effects of roll speed, roller diameter, setback length and strip thickness on the position of the solidification front and the surface quality of strip were analyzed through experiments. A kiss-point model which considers the strip thickness, set-back length and roll speed was established to optimize process and enhance the surface quality of magnesium alloy strip. Results showed that the twin-roll casting process could be effectively stabilized and optimized under the direction of the model, and the defectless magnesium alloy strip was obtained.

Research and Verification on Damping Performance of Magnesium Alloy

2013 ◽  
Vol 668 ◽  
pp. 794-798
Author(s):  
Yun Ni ◽  
Ya Ling Huang ◽  
Wei Tan
Keyword(s):  
Mathematical Model ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Strain Amplitude ◽  
Comparison Test ◽  
Material Deformation ◽  
Alloy Material ◽  
The Mathematical Model

The paper analyzes the length variety of the crystal gain and sub-crystal gain of magnesium alloy materials during the strain amplitude augmentation in the linearity stage of the material deformation, and then based on G-L model derives the mathematical model of the damping variety durign the strain amplitude augmentation in the linearity strain stage of the magnesium alloys. Consequently, magnesium alloy damping mechanism is studied theoretically. It is proved that the magnesium alloy material has the advantages of high damping capacities. In addition, a comparison test in terms of damping performance is made between magnesium alloy and other alloys, which further confirms the high damping of magnesium alloy and the rightness of the theoretical deduced conclusion.

Increasing the Quality of Welded Joints of Al-Si 6082 Alloys by Introducing Forced Vibrations

2017 ◽  
Vol 907 ◽  
pp. 231-237
Author(s):  
Mihai Alexandru Bodeanu ◽  
Teodor Machedon-Pisu
Keyword(s):  
Longitudinal Vibration ◽  
Welding Process ◽  
Solidification Process ◽  
Forced Vibrations ◽  
Major Influence ◽  
Material Structure ◽  
Welding Equipment ◽  
Welded Structure ◽  
Surface Welding

The solidification process of aluminum alloys welded area has a major influence on the quality of the joining material. Based on this fact, the introduction of forced vibrations during welding aims to prevent the formation of increase tensions inside the welded structure and diminish the presence of pinholes or pores as a result of material contraction of alloys containing metals with a different melting point / solidification point.To avoid this happening it is essential to know and control how the melted material is evolving during the solidification. This step requires that the Al-Si alloy to be welded on a surface with longitudinal vibration composed of a platform whose support can be controlled depending on the required frequency and un M.I.G welding equipment with mechanized welding torch setup to weld, the test peace, above the platform surface. Welding in a mechanical forced vibration environment, results in the formation of a more uniform and finer grain size microstructure with a more advanced diffusion in the affected zone. The diffusion process occurs faster resulting in decreased structural tensions. The presence of voids and pores inside the material structure is inferior for the oscillating welding process in comparison with the classic solution.

The Development of Control System for Lowcost Automatic Welding Equipment of Aluminum Radiator Head

2012 ◽  
Vol 485 ◽  
pp. 12-15
Author(s):  
Ju Lian Ma ◽  
Hao Bin Zhou ◽  
Xiang Qian Xu ◽  
Xiao Wei Wang
Keyword(s):  
Control System ◽  
Low Cost ◽  
Welding Process ◽  
Welding Parameters ◽  
Automatic Welding ◽  
Control Board ◽  
Manual Operation ◽  
Welding Equipment ◽  
Production Site

Considering the characteristic of welding process for all-aluminum radiator and meeting the needs of Chinese production site, low-cost automatic welding equipment for aluminum radiator head has been designed, and this paper focuses on its electrical controls. The microkernel of main control board is C8051F020. Based on this board the subsystems for the entire piece of this equipment has been established, which include LCD，automatic welding, manual operation , welding parameters setting ,etc. Through trial runs of the machine, it indicates that the design of the electrical controls for the equipment is rational, full-featured, and works reliably and efficiently. And the quality of welding is well.

Study on Horizontal TIG Welding Process of 1Cr18Ni9Ti Stainless Steel Tube

2018 ◽  
Vol 777 ◽  
pp. 377-380
Author(s):  
Min Hu
Keyword(s):  
Stainless Steel ◽  
Process Parameters ◽  
Welding Process ◽  
Steel Tube ◽  
Tig Welding ◽  
Stainless Steel Tube ◽  
Welding Operation ◽  
Hot Crack ◽  
Welding Materials

To improve the welding performance and guarantee the quality of welds, this paper mainly starts with reasonably selecting welding materials before welding, choosing appropriate welding process parameters, paying full attention to the welding operation skills of positioning welding, base coating, filling and cap welding, to study horizontal TIG welding process of 1Cr18Ni9Ti stainless steel tube, and prevent the generation of hot crack defects.

scholarly journals Modeling of chemical composition in the melt pool during laser welding of Aluminum / Magnesium alloys

2021 ◽  
Vol 321 ◽  
pp. 01008
Author(s):  
Sabrine Ben Halim ◽  
Wassim kriaa ◽  
Michel Autric
Keyword(s):  
Chemical Composition ◽  
Laser Welding ◽  
Magnesium Alloys ◽  
Chemical Elements ◽  
Welding Process ◽  
Intermetallic Phases ◽  
Transient Model ◽  
Melted Zone ◽  
Melt Pool ◽  
Aluminum Magnesium Alloys

Joining dissimilar metals is very difficult due to the formation of brittle intermetallic phases which may be detrimental to mechanical properties. The present work aims to investigate the transport phenomenon in the weld bead and to understand the materials mixing during laser welding process of dissimilar Aluminum-Magnesium alloys. A three-dimensional transient model based on fluid flow, heat and mass transfer has been developed to predict the formation of the weld and to study numerically and experimentally the diffusion of alloying elements in the melted zone. SEM analysis of chemical composition has been realized to map elements distribution in the melted zone. The results of simulation show the formation of a heterogeneous mixture in the melt pool. The elements distribution map and the presence of brittle intermetallic phases in the fusion zone were analysed. The formation of intermetallic compounds, comprising Al3Mg2 and Al12Mg17 phases were predicted by studying the chemical elements distribution in the weld pool. A good tendency between experimental and numerical results is noticed for the weld.

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