scholarly journals Effect of Current on the Microstructural and Mechanical Properties of Mig Welded Aa6061 Aluminum Alloy

2020 ◽  
Vol 8 (5) ◽  
pp. 4727-4732
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Fusion Zone ◽  
Filler Metal ◽  
Base Material ◽  
Thermal Conditions ◽  
Mig Welding ◽  
Metal Solidification ◽  
Columnar Grains ◽  
Aa6061 Aluminium Alloy

Aluminium and its alloy has very wide area of application i.e. aerospace, automobile and structural industries. The present investigation aimed to study the effect of MIG welding on microstructural and mechanical properties of AA6061 aluminium alloy. The characteristics of fusion zone is typical coarse columnar grains structure because of the prevailing thermal conditions during weld metal solidification. In this work, plates of 5mm thickness have been used as the base material for preparing single pass butt welded joints at different-different current values. The filler wire used for joining the plates is AA4043 (Al-5%Si by wt.) grade aluminium alloy. From this investigation, it was found that the hardness of fusion zone was degraded significantly due to usage of lower hardness filler metal. The precipitation evolution in the heat-affected zone was characterized by XRD which improves the tensile properties of the welded AA6061 alloy.

Improvement of Welding Repair Aluminium Alloy 6082T6 by MIG Welding Process

2016 ◽  
Vol 872 ◽  
pp. 8-12
Author(s):  
Nitipon Nimaeh ◽  
Prapas Muangjunburee
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloy ◽  
Pulse Current ◽  
Welding Process ◽  
Mechanical Tests ◽  
Mig Welding ◽  
Repair Welding ◽  
Better Than

The repair welding of aluminium alloy 6082T6 with two fillers 4043 and 5356 were studied by using MIG welding process with pulse current at frequency 5 Hz. After that, macrostructure and microstructure were investigated and the density of porosity and testing of mechanical properties were determined. The results found that the density of new weld was less than repair weld. The results of mechanical tests showed that the new weld were better than the repair weld.

Study on the Microstructure and the Mechanical Properties of TA2

2012 ◽  
Vol 472-475 ◽  
pp. 2655-2658
Author(s):  
Xiao Dong Hu ◽  
Sen Zhang ◽  
Yong Zhang ◽  
Ya Jiang Li
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Arc Welding ◽  
Weld Zone ◽  
Base Material ◽  
Annealing Treatment ◽  
Welding Joint

The microstructure and the mechanical properties of welding joint with the material of TA2 have been studied in this paper with the specimens made with the method of argon-arc welding. The microhardness of the welding joint has been compared with the hardness in the same position of the weld joint after annealing. Conclusions have been obtained as follows: The organizations of the welding joint include base material, recrystallization zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as M-shape with the softest point located at the center, and the hardest is located at the overheated zone; the annealing treatment can enhance the weld joint hardness mainly at the center, and the hardness of other zones change little.

Effect of Process Variables on Microstructure and Mechanical Properties of Wide-Gap Brazed IN738 Superalloy

2005 ◽  
Vol 297-300 ◽  
pp. 2876-2882 ◽  
Author(s):  
Yong Hwan Kim ◽  
Il Ho Kim ◽  
C.S. Kim
Keyword(s):  
Mechanical Properties ◽  
Metal Powder ◽  
Filler Metal ◽  
Rupture Life ◽  
Base Material ◽  
Material Strength ◽  
Main Process ◽  
Process Variables ◽  
Microstructure And Mechanical Properties ◽  
Wide Gap

This study investigated the microstructure and mechanical properties of a wide-gap region brazed with various process variables. The IN738 and DF 4B alloy powders were used as additive and filler metal powder for the brazing process. The wide-gap brazing process was carried out in a vacuum of 2×10-5 torr. The wide-gap region brazed with 60wt.% IN738 additive powder had a microstructure consisting of IN738 additive and (Cr, W)2B. The fracture strength of the wide-gap region (60 wt.% additive and 40 wt.% filler metal powder) brazed at 1230°C for 30hr was as high as 862MPa (93% of base material strength). It was observed that the brazing temperature was the main process variable affecting the mechanical properties of the wide-gap brazed region. The creep rupture life of the region brazed with 60wt.% additive and 40 wt.% was longer than that of other brazed samples. The Cracks in the wide-gap brazed region initiated at the (Cr, W)2B and propagated through them. It was found that the (Cr, W)2B and the pore in the brazed region are important microstructural factors affecting the mechanical properties of the wide-gap brazed region.

Study on the Microstructure and the Mechanical Properties of Zr R60702

2012 ◽  
Vol 510 ◽  
pp. 679-682 ◽  
Author(s):  
Xiao Dong Hu ◽  
Sen Zhang ◽  
Yong Zhang ◽  
Ya Jiang Li
Keyword(s):  
Mechanical Properties ◽  
Fusion Zone ◽  
Weld Joint ◽  
Arc Welding ◽  
Weld Zone ◽  
Base Material ◽  
Annealing Treatment ◽  
Welding Joint

The microstructure and the mechanical properties of welding joint with the material of R60702 have been studied in this paper with the specimens made with the method of argon-arc welding, and the according mechanical properties of the weld joint have been compared with the annealed microstructure at the temperature of 600.Conclusions have been obtained as follows: The organizations of the welding joint include base material, normalizing zone, overheated area, fusion zone and the weld zone; the hardness tendency of the weld joint is depicted as W-shape with the hardest point located at the center, and the softest points is located at the normalizing zone; the annealing treatment can improve the ductility and soften the weld joint mainly at the center.

Mechanical Properties of Forged Ti-6Al-4V Structure by Electron Beam Welding

2012 ◽  
Vol 455-456 ◽  
pp. 308-313
Author(s):  
Hong Yu Qi ◽  
Jian Xie ◽  
Shao Lin Li ◽  
Xiao Guang Yang
Keyword(s):  
Mechanical Properties ◽  
Electron Beam ◽  
Fusion Zone ◽  
Electron Beam Welding ◽  
Welded Joint ◽  
Base Material ◽  
Structure Design ◽  
Large Gradient ◽  
Welded Structure ◽  
Aero Engine

The blisk (bladed disk) is a new structural component of the modern aero-engine and plays an important role in improving its performance. Ti-6Al-4V alloy joints welded by electron beam have been widely used for compressor blisk in advanced aero engine. It is necessary to analyze microstructure and mechanical properties of Ti-6Al-4V welded structure by electron beam welding (EBW) for failure analysis and structure design of blisk. Microstructure of Ti-6Al-4V welded structure by EBW was investigated by microscopic observation and micro indentation testing. Experiment results show grain coarsening in fusion zone (FZ) and heat affected zone (HAZ) appears large gradient organization structure, which presents significant local heterogeneity. On the centerline perpendicular to the welding direction, Vickers microhardness was measured in increments of 1mm, 0.5mm, 0.25mm and 0.1mm. Due to the presence of martensite, microhardness of the fusion zone is about 20% higher than that of the base material. The size of joints in different regions was acquired, 2.5 to 3.0-mm-wide in FZ and about 0.7-mm-wide in HAZ respectively. Three different types of EBW samples were designed for tensile test, including welded structure, welded joint and base material. Three different stress-strain curves of specimens were acquired, including welded joint. The experiment data indicates that the tensile strength of welded joints is 8% more than that of the base metal.

Microstructure Characteristics and Properties of 1561 Aluminum Alloy Weldments Processed by Different MIG Welding

2017 ◽  
Vol 893 ◽  
pp. 163-168
Author(s):  
Shan Guo Han ◽  
Shi Da Zheng ◽  
De Tao Cai ◽  
Yao Yong Yi ◽  
Zi Yi Luo
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Weld Zone ◽  
Base Material ◽  
Particle Phase ◽  
Mig Welding ◽  
Single Wire ◽  
Microstructure Characteristics ◽  
Different Characteristics ◽  
Scanning Electron

The mechanical properties and microstructural features of 1561 aluminum alloy weldments processed by single-wire MIG welding and CMT TWIN welding are investigated. The microstructure and mechanical properties of welded joints were studied by nondestructive testing, metallurgical test, scanning electron microscopy test, fatigue and tensile test. It is revealed that the welding efficiency of CMT TWIN welding is more than six times as much as single-wire MIG welding. It can be easy to find weld zone (WZ), fusion line (FL), heat affected zone (HAZ) and base metal (BM) with different characteristics in the metallographic specimen. In weld zone, the particle phase sizes are smaller than that of base material, but the densities of particle phase are increased. The sample fatigue strength of CMT TWIN welding is higher than the singe-wire MIG welding. It is suggested that the CMT TWIN welding has several advantages compared with single-wire MIG welding.

Research on GTAW/SMAW Weldability of ADI/DI Using Electrodes ENi-Cl and ENiFe-Cl-A

2015 ◽  
Vol 1128 ◽  
pp. 242-253
Author(s):  
Ioan Catalin Mon ◽  
Mircea Horia Tierean ◽  
Adel Nofal
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Ductile Iron ◽  
Arc Welding ◽  
Filler Metal ◽  
Welded Joint ◽  
Base Material ◽  
Mechanical Tests ◽  
X Rays ◽  
Gtaw Process

The present research is dedicated to weldability of Austempered Ductile Iron (ADI) and Ductile Iron (DI) using Shielded Metal Arc Welding (SMAW) and Gas Tungsten Arc Welding (GTAW) methods. The welds were done using the arc welding process with Nickel base filler materials: ENi-Cl and ENiFe-Cl-A. Each weldment was examined visually, with X-rays and mechanical tests. After the mechanical tests, tensile test and impact properties of the welded joint are lower than mechanical properties of the ADI base material using ENiFe-Cl-A filler metal and GTAW process. This type of filler metal ENiFe-Cl-A can be applied successfully only for repair by welding of ADI parts. Using ENi-Cl filler metal with GTAW process applied to DI, the mechanical tests, tensile test and hardness of the welded joint are greater than mechanical properties of the DI base material. This procedure can be applied for welding. In case on DI welded using SMAW with ENi-Cl electrodes, the hardness of the welded joint is lower than the hardness of base material. This procedure can be applied only for repair by welding.

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