Research on the Technology for DC CMT Welding of AZ31B Magnesium Alloy

2013 ◽  
Vol 483 ◽  
pp. 18-22
Author(s):  
Rui Ying Zhang ◽  
Yun Yan Hu ◽  
Jun Wang
Keyword(s):  
Magnesium Alloy ◽  
Welding Speed ◽  
Orthogonal Experiment ◽  
Testing Machine ◽  
Weld Zone ◽  
Welding Current ◽  
Alloy Sheet ◽  
Arc Length ◽  
Az31b Magnesium Alloy ◽  
Cmt Welding

Orthogonal experiment method was used on DC CMT welding of AZ31B magnesium alloy sheet. The tensile test was carried out on the CMT5305 microcomputer control universal testing machine .The effect regular of welding current, arc length correction and welding speed on tensile strength and elongation was analyzed and acquired the optimal combination of process parameters. That is, welding current is 62A, arc length correction is +30% and welding speed is 50cm/min. The microhardness test on joints was carried out. Its found that the curve of microhardness is "W" shaped and the micro-hardness of HAZ is minimum and that of weld zone is maximum.

The Microstructure and Properties of TIG Welded Joint of AZ31B/Cu Dissimilar Metal

2014 ◽  
Vol 941-944 ◽  
pp. 2047-2052
Author(s):  
Shuang Ming Du ◽  
Jie Hu ◽  
Tian Lan
Keyword(s):  
Magnesium Alloy ◽  
Welded Joint ◽  
Weld Zone ◽  
Central Area ◽  
Welding Current ◽  
Hardness Test ◽  
Micro Hardness ◽  
Az31b Magnesium Alloy ◽  
Metal Plates ◽  
Metallurgical Defects

AZ31B magnesium alloy and T2 Cu metal plates with the thickness of 2mm were bonded by argon tungsten arc welding (TIG) under the conditions that the welding current is 100A and the welding speed is 150 mm/min. The microstructure, phase composition and properties of welded joint were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness test. The results show that AZ31B magnesium alloy and T2 Cu combined well with no cracks, porosities, incomplete penetration and other metallurgical defects. A transition zone composed of equiaxed and columnar crystals of α-Cu exists between the weld metal and base metal Cu, its width is about 80μm. The central area of the weld is made up of α-Mg matrix and Mg-Cu eutectic. The joint consists of α-Cu, α-Mg, Cu2Mg, Mg2Cu and little MgO, CuO phase. The micro-hardness of weld zone is significantly higher than that of the base metals, and its heat affected zone appears softening phenomenon.

A Study on the Formability of AZ31B Magnesium Alloy Sheet with Experiment and Simulation

2009 ◽  
Vol 620-622 ◽  
pp. 173-176
Author(s):  
Jung Han Song ◽  
Geun An Lee ◽  
Hye Jin Lee ◽  
Nak Kyu Lee ◽  
S.H. Kim ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Testing Machine ◽  
Alloy Sheet ◽  
Forming Limit ◽  
Limit Curve ◽  
Forming Limit Curve ◽  
Initial Shape ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Hemispherical Punch

This paper is concerned with formability of AZ31B magnesium alloy sheets at various temperatures. In order to acquire the forming limit curve for quantifying the formability of the magnesium alloy sheet, hemispherical punch forming tests are performed under various temperatures. The initial shape of the blank is rectangular and six different types of specimens are used with their length along the rolling direction of 175mm and widths along the transverse direction of 25, 50, 75, 100, 120 and 175mm. With the equipment of on a SIMADZU 100-ton universal testing machine, hemispherical punch forming tests are performed and a forming limit diagram is constructed at the temperature of 100°C, 200°C and 250°C. FE analyses of hemispherical punch forming tests are also conducted by considering ductile failure model in order to compare the forming limit curve obtained from the experiment and numerical analysis. The comparison examines problems in the current material model and it suggests a future research direction.

INVESTIGATION OF PULSE FREQUENCY ON FUSION ZONE CHARACTERISTICS OF GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Subravel V
Keyword(s):  
Magnesium Alloy ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Welding Speed ◽  
Pulse Frequency ◽  
Pulsed Current ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Different Levels

In this investigation an attempt has been made to study the effect of welding on fusion characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of welding speed (105 mm/min –145 mm/min). From this investigation, it is found that the joints fabricated using a welding speed of 135 mm/min yielded superior tensile properties compared to other joints. The formation of finer grains and higher hardness in fusion zone and uniformly distributed precipitates are the main reasons for the higher tensile properties of these joints

Influence of Hot-Extrusion on Mechanical Properties of AZ31B Magnesium Alloy Sheet

2005 ◽  
Vol 15 (1) ◽  
pp. 25-30
Author(s):  
Yong-Gil Kim ◽  
Hak-Kyu Choi ◽  
Min-Cheol Kang ◽  
Hae-Yong Jeong ◽  
Cha-Hurn Bae
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Hot Extrusion ◽  
Alloy Sheet ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Az31b Magnesium Alloy Sheet

Double-Electrode GMAW Welding Process Research Based on the DSC

2013 ◽  
Vol 668 ◽  
pp. 321-324 ◽  
Author(s):  
Guo Hong Ma ◽  
Jun Nie ◽  
Chao Yang Zhang ◽  
Jia Ye
Keyword(s):  
Magnesium Alloy ◽  
Welding Process ◽  
Alloy Sheet ◽  
Process Research ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Double Electrode ◽  
Az31b Magnesium Alloy Sheet ◽  
Gmaw Welding

Through a large number of technology experiments, finding out the matching parameters of the DE-GMAW welding of the AZ31B magnesium alloy sheet based on the DSC. This paper simply controls the motor based on the DSC to control the welding torches moving comfortably to make the welding process stable to obtain the good weld.

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