Research on Droplet Transfer of MIG Welding with Alternating Longitudinal Magnetic Field

The stress and motion state of droplet in MIG welding with alternating longitudinal magnetic field were analyzed, and the impact of alternating longitudinal magnetic field on the droplet transfer were studied by high-speed video camera. The results show that the droplet is spherical approximately and transfer to molten pool along the welding wire axis without external longitudinal magnetic field. When alternating longitudinal magnetic field was introduced into welding process, the droplet rotate around the welding wire clockwise and counter-clockwise alternately. Shape of droplet became flat and direction of transfer deviated from the welding wire axis under the action of magnetic field. As the exciting current increased, extent of deviation from the wire axis increases. When the exciting current is too large (I >20A), extent of deviation is too large and droplet are disintegrated into several small droplet during the transition. So droplet can not transfer into molten pool successfully and the bead can’t be formed.

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The Impact of Adscititious Longitudinal Magnetic Field on CO2 Welding Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.1447 ◽

2012 ◽

Vol 538-541 ◽

pp. 1447-1450 ◽

Cited By ~ 3

Author(s):

Shu Yuan Jiang ◽

Xiao Wei Wang ◽

Huan Ming Chen ◽

Pin Liu

Keyword(s):

Magnetic Field ◽

High Speed ◽

Longitudinal Magnetic Field ◽

Short Circuit ◽

Welding Process ◽

Welding Current ◽

High Speed Photography ◽

Current Decay ◽

Co2 Welding ◽

The Impact

Aiming at the welding arc can act with the magnetic field, has electrical quasi-neutral and electrical conductivity. This paper introduced an adscititious longitudinal magnetic field to control the CO2 welding process and used the Hanover Welding Quality Analyzer to acquire the real-time welding signal. Meanwhile, the short circuit behavior of CO2 welding under the adscititious longitudinal magnetic field, was monitored with the High-speed Photography System. The results show that when the excitation current in an optimal range, the welding current decay and the frequency of short circuit transition is uniform and faster, smaller droplet size and the welding process is more stability than welding without adscititious magnetic field.

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Droplet Transfer and Microstructure of Q235 Steel Thick Plate Using CO2 Welding with Additional Longitudinal Magnetic Field Controlling

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.102-104.451 ◽

2010 ◽

Vol 102-104 ◽

pp. 451-454

Author(s):

Qian Luo ◽

Duan Min Lu ◽

Jian Luo

Keyword(s):

Magnetic Field ◽

Thick Plate ◽

Longitudinal Magnetic Field ◽

Low Carbon Steel ◽

Welding Process ◽

Low Carbon ◽

Droplet Transfer ◽

Welding Seam ◽

Co2 Welding ◽

Welding Joints

In this paper, a new welding experiment is studied by applying an additional longitudinal electromagnetic field to CO2 welding process (abbr. LEM-CO2 welding).The characteristics of droplet transfer, macrostructure and microstructure are compared between LEM- CO2 welding and general CO2 welding on Q235 low carbon steel thick plate joint. The research results shows that, an additional longitudinal magnetic field can have a significant effect on properties of the droplet transfer in CO2 welding, the frequency and stability of the droplet transfer in LEM-CO2 welding are improved. The grains of welding seam are refined and welding joints has a higher quality. So the additional longitudinal magnetic field is a very simple and effective method to improve the properties of CO2 welding thick plate joint.

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Numerical Simulation of MIG Welding Arc with Longitudinal Magnetic Field

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.668 ◽

2011 ◽

Vol 704-705 ◽

pp. 668-673 ◽

Cited By ~ 1

Author(s):

Qi Wei Wang ◽

Sheng Zhu ◽

Feng Liang Yin ◽

Yuan Yuan Liang ◽

Xiao Ming Wang

Keyword(s):

Magnetic Field ◽

Numerical Simulation ◽

Current Density ◽

Longitudinal Magnetic Field ◽

Welding Process ◽

Three Dimensions ◽

Anode Surface ◽

Mig Welding ◽

Welding Arc ◽

Arc Pressure

In the study three dimensions finite element mathematical model of MIG welding with longitudinal magnetic field was established. By ANSYS FEA software the temperature and other physical characteristics of the arc were obtained including the distributions of current density and arc pressure on the anode surface. The simulated results show that when the additional longitudinal magnetic field was introduced into welding process, the temperature of arc decreased remarkably and peak value of temperature changed from 16 950K to 13 700K at a welding current of 120A. Under the action of longitudinal magnetic field, on the one hand, heat flux density and current density at the anode surface decrease in the arc core and rise at the edge of arc, on the other hand, arc pressure decrease and arc potential increase. Keywords: Numerical simulation; MIG welding arc; magnetic field

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Analysis on Thermal Efficiency and Softening Behavior of MIG Welding with Longitudinal Magnetic Field

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.148-149.326 ◽

2010 ◽

Vol 148-149 ◽

pp. 326-331 ◽

Cited By ~ 1

Author(s):

Sheng Zhu ◽

Qi Wei Wang ◽

Xiao Ming Wang ◽

Guo Feng Han

Keyword(s):

Magnetic Field ◽

Base Metal ◽

Thermal Efficiency ◽

Heat Input ◽

Longitudinal Magnetic Field ◽

Welding Current ◽

Mig Welding ◽

Softening Behavior ◽

Exciting Current ◽

The Magnetic Field

In the study, thermal efficiency in MIG welding of aluminum alloy with longitudinal magnetic field was analyzed, as well as softening behavior of heat-affected zone (HAZ) and base metal were investigated. The results showed that welding current decreased and resultingly total heat input reduced as the exciting current increased, meanwhile arc thermal efficiency increased and melting efficiency decreased. As a result of action of the magnetic field, the trend of grain growth of HAZ slowed down and the influence on base metal of heat input decreased. When the exciting current was 20A, microhardness of HAZ and base metal improved evidently. However, as the exciting current continued to increase, the effect of magnetic field on softening behavior did not change significantly.

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Influence of Alternative Magnetic Field Frequency on Microstructure and Properties of Surfacing Welding Layer of Aluminum Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.697-698.351 ◽

2011 ◽

Vol 697-698 ◽

pp. 351-355 ◽

Cited By ~ 3

Author(s):

S. Zhu ◽

Qi Wei Wang ◽

F.L. Yin ◽

Y.Y. Liang ◽

L. Chen

Keyword(s):

Magnetic Field ◽

Mechanical Property ◽

Aluminum Alloy ◽

Longitudinal Magnetic Field ◽

Welding Process ◽

Grain Refining ◽

Field Frequency ◽

Magnetic Field Frequency ◽

Microstructure And Properties ◽

Exciting Current

In order to optimize the MIG welding procedure of aluminum alloy with longitudinal magnetic field and improve the mechanical property, effect of longitudinal magnetic field frequency on microstructure and properties of surfacing layer were investigated. The results show that when the additional longitudinal magnetic field was introduced into welding process, grain was refined, the wear resistance and tensile strength of the surfacing layer were improved as longitudinal magnetic field frequency increased. When frequency of magnetic field is 20 Hz and exciting current is 15 A, effect of grain refining is the best and the mechanical property is the highest. But when exciting current continue to increase, grain became coarse and the mechanical property decreased. So it is concluded that grain was refined and the mechanical property of the surfacing layer were improved under longitudinal magnetic field. But magnetic field frequency has an optimal value; otherwise grain refining and the mechanical property can’t achieve the best effect.

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Solidification cracking susceptibility of aluminium alloy welds. Effects of descending molten pool temperature using double wire MIG welding process

Welding International ◽

10.1080/09507119909447431 ◽

1999 ◽

Vol 13 (9) ◽

pp. 677-682 ◽

Cited By ~ 1

Author(s):

J Nakata ◽

H Miyauchi ◽

T Shinoda ◽

Y Sugiyama

Keyword(s):

Aluminium Alloy ◽

Molten Pool ◽

Welding Process ◽

Solidification Cracking ◽

Mig Welding

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Metallurgical Characterization of API X65 Steel Joint Welded by MIG Welding Process with Axial Magnetic Field

Materials Research ◽

10.1590/1980-5373-mr-2016-0182 ◽

2017 ◽

Vol 20 (5) ◽

pp. 1174-1178 ◽

Cited By ~ 4

Author(s):

Constantino Natividad ◽

Rafael García ◽

Victor H. López ◽

Antonio Contreras ◽

Melchor Salazar

Keyword(s):

Magnetic Field ◽

Axial Magnetic Field ◽

Welding Process ◽

Mig Welding ◽

Steel Joint ◽

Api X65 Steel ◽

X65 Steel ◽

Metallurgical Characterization

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Study the Effect of Welding Heat Input on the Microstructure, Hardness, and Impact Toughness of AISI 1015 Steel

Al-Khwarizmi Engineering Journal ◽

10.22153/https://doi.org/10.22153/kej.2018.08.005 ◽

2018 ◽

Vol 14 (1) ◽

pp. 118-127 ◽

Cited By ~ 1

Author(s):

Emad Kh. Hamd ◽

Abbas Sh. Alwan ◽

Ihsan Khalaf Irthiea

Keyword(s):

Corrosion Rate ◽

Weld Joint ◽

Heat Input ◽

Plate Thickness ◽

Welding Process ◽

Welding Current ◽

Low Carbon ◽

Mig Welding ◽

The Impact ◽

Weld Heat

In the present study, MIG welding is carried out on low carbon steel type (AISI 1015) by using electrode ER308L of 1.5mm diameter with direct current straight polarity (DCSP). The joint geometry is of a single V-butt joint with one pass welding stroke for different plate thicknesses of 6, 8, and 10 mm. In welding experiments, AISI 1015 plates with dimensions of 200×100mm and edge angle of 60o from both sides are utilized. In this work, three main parameters related to MIG welding process are investigated, which are welding current, welding speed, heat input and plate thickness, and to achieve that three groups of plates are employed each one consists of three plates. The results indicate that increasing the weld heat input (through changing the current and voltage) leads to an increase in widmanstatten ferrite (WF), acicular ferrite (AF) and polygonal ferrite (PF) in FZ region, and a reduction in grain size. It is observed that the micro-hardness of welded AISI 1015 plate increases as the weld heat input decreases. As well as increasing the weld heat input results in an increase in the width of WM and HAZ and a reduction in the impact energy of the weld joint of AISI 1015 at WM region. Also, it is noted the corrosion rate of weld joint increases with increase of Icorr due to increasing in welding current (heat input), corrosion rate increased up to (0.126µm/yr.) with increasing of heat input up to (1.27 KJ/mm).

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