Movement of Liquid Metal in a Weld Pool when Welding with Pulsed Arc 

2014 ◽  
Vol 682 ◽  
pp. 386-391 ◽  
Author(s):  
A.G. Krampit ◽  
A.V. Dmitriyeva
Keyword(s):  
Carbon Dioxide ◽  
Liquid Metal ◽  
Weld Pool ◽  
Arc Welding ◽  
High Speed ◽  
Consumable Electrode ◽  
Pulsed Arc Welding ◽  
Pool Surface ◽  
Carbon Dioxide Gas ◽  
Pulsed Arc

High-speed shooting records of consumable electrode pulsed arc welding in an atmosphere of carbon dioxide gas help to obtain data of changes on a weld pool surface.

The Oscillation Behaviour of Liquid Metal in Arc Welding

2007 ◽  
Vol 539-543 ◽  
pp. 3877-3882 ◽  
Author(s):  
M.J.M. Hermans ◽  
B.Y.B. Yudodibroto ◽  
Yoshinori Hirata ◽  
G. den Ouden ◽  
I.M. Richardson
Keyword(s):  
Liquid Metal ◽  
Weld Pool ◽  
Arc Welding ◽  
High Speed ◽  
Numerical Models ◽  
Experimental Studies ◽  
Intermediate Step ◽  
Filler Wire ◽  
Research Activities ◽  
Penetration Control

This paper gives an historic overview and new developments of research activities in the field of the oscillatory behaviour of liquid metal in arc welding. Early work focused on the oscillation behaviour of the weld pool in Gas Tungsten Arc Welding (GTAW). Agitated weld pools exhibit specific modes of oscillation, the frequency of which can be measured from the arc voltage data and is conditioned by the geometry of the weld pool and the properties of the liquid metal. Of technological interest is the alteration of the oscillation behaviour for partially and fully penetrated situations, which can be used for penetration control during welding. A logical extension of the research activities was related to the influence of filler wire addition on the oscillation behaviour. An intermediate step towards the description of Gas Metal Arc Welding (GMAW), is the situation of GTAW with cold filler wire supply. It was found that both the liquid weld pool and the pendant liquid droplet at the tip of the filler wire experience an oscillation, which obscures the influence of the individual contributions of both liquid masses on the voltage data. It was shown that online penetration control is still possible, provided that the metal is transferred in an uninterrupted way, i.e. the filler wire flows smoothly into the weld pool. For GMAW, in which detached droplets collide with the weld pool surface, the difficulties are even more prominent. Recent work is related to this issue. Monitoring of the phenomena occurring at the weld pool and the pendant droplet become problematic by means of the voltage data. Observations by means of high-speed video imaging will be discussed. Apart from the experimental studies, efforts are undertaken in numerical simulations of the processes. A good correlation is obtained between experimental data and the results of the numerical models.

The Development and Practical Application of Adaptive Pulse-Arc Welding in the Manufacturing and Repair of Metal Structures Responsible Function

2014 ◽  
Vol 682 ◽  
pp. 332-338 ◽  
Author(s):  
Yu.N. Saraev ◽  
V.A. Lebedev ◽  
S.A. Solodsky
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Spatial Position ◽  
Practical Significance ◽  
Practical Application ◽  
Pulsed Arc Welding ◽  
Metal Structures ◽  
Kinetics Of ◽  
Electrode Metal ◽  
Pulsed Arc

This paper deals with issues related to the development and practical application of adaptive pulse-arc welding in the manufacture and repair of metal for critical applications. Created methods of adaptive pulsed arc welding into account the results of studies of the kinetics of melting and transfer of electrode metal into the weld pool, which is of great theoretical and practical significance. These methods ensure defect-free formation of root, fill and cap welds in manufacturing steel in different spatial position.

scholarly journals Measurement of weld pool oscillation in pulsed TIG welding - Study on pulsed arc welding (Report 5)

1985 ◽  
Vol 3 (3) ◽  
pp. 457-464 ◽  
Author(s):  
Hiroshi Maruo ◽  
Yoshinori Hirata ◽  
Toshikuni Kusano ◽  
Ikuo Okano
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Tig Welding ◽  
Pulsed Arc Welding ◽  
Pulsed Tig Welding ◽  
Pulsed Arc

Definition of Peak Value of Welding Current at Pulsed Arc Welding

2014 ◽  
Vol 682 ◽  
pp. 397-400 ◽  
Author(s):  
N.Yu Krampit ◽  
M.A. Krampit ◽  
L.N. Zubenko
Keyword(s):  
Carbon Dioxide ◽  
Arc Welding ◽  
Welding Current ◽  
Pulsed Arc Welding ◽  
Metal Drop ◽  
Drop Detachment ◽  
Definition Of ◽  
Electrode Metal ◽  
Pulsed Arc ◽  
Peak Value

Pulsed arc welding is one of the ways to control the process of an electrode metal drop transfer actively. Conditions of an electrode metal directional transfer during a pulse-arc welding were investigated, and provided the basis for welding current peak value calculation. Theoretical conditions of an electrode metal drop detachment during a pulse-arc carbon dioxide welding were proved experimentally.

Features of structure formation and properties of joints of S460M steel, made by pulsed-arc welding

2020 ◽  
Vol 2020 (6) ◽  
pp. 11-16
Author(s):  
A.V. Zavdoveev ◽  
◽  
V.D. Pozdnyakov ◽  
M. Rogante ◽  
S.L. Zhdanov ◽  
...  
Keyword(s):  
Structure Formation ◽  
Arc Welding ◽  
Pulsed Arc Welding ◽  
Pulsed Arc

Pulsed TIG Welding of Aluminum

2019 ◽  
Author(s):  
S. Katoh
Keyword(s):  
Arc Welding ◽  
High Performance ◽  
Control Function ◽  
Tig Welding ◽  
Inert Gas ◽  
Pulsed Arc Welding ◽  
Scope Of Application ◽  
Practical Performance ◽  
Pulsed Tig Welding ◽  
Pulsed Arc

As a consequence of developments in the electronic control of welding power sources, there has been a trend for even inexpensive and widely used metal inert gas (MIG) and tungsten inert gas (TIG) welding machines to be equipped, as standard, with a high performance pulsed current waveform control function. Meanwhile advances in understanding of pulsed arc welding phenomena and the clarification of the associated functional effects have resulted in a gradual expansion of its scope of application and of improvements in practical performance. Thus inert gas shielded arc welding is entering an epoch when full scale pulsed arc welding will become standard. In this article, the progress of the development of pulsed TIG welding of aluminium is introduced, followed by a description of the main characteristics and finally examples of recent research concerning the improvement of weld quality are introduced.

scholarly journals Relationship among Welding Defects with Convection and Material Flow Dynamic Considering Principal Forces in Plasma Arc Welding

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1444
Author(s):  
Huu Loc Nguyen ◽  
Anh Van Nguyen ◽  
Han Le Duy ◽  
Thanh-Hai Nguyen ◽  
Shinichi Tashiro ◽  
...  
Keyword(s):  
Weld Pool ◽  
Material Flow ◽  
Arc Welding ◽  
Welding Current ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Flow Dynamic ◽  
Pool Surface ◽  
Welding Defects ◽  
Marangoni Force

The material flow dynamic and velocity distribution on the melted domain surface play a crucial role on the joint quality and formation of welding defects. In this study, authors investigated the effects of the low and high currents of plasma arc welding on the material flow and thermodynamics of molten pool and its relationship to the welding defects. The high-speed video camera (HSVC) was used to observe the convection of the melted domain and welded-joint appearance. Furthermore, to consider the Marangoni force activation, the temperature on the melted domain was measured by a thermal HSVC. The results revealed that the velocity distribution on the weld pool surface was higher than that inside the molten weld pool. Moreover, in the case of 80 A welding current, the convection speed of molten was faster than that in other cases (120 A and 160 A). The serious undercut and humping could be seen on the top surface (upper side) and unstable weld bead was visualized on the back side (bottom surface). In the case of 160 A welding current, the convection on the weld pool surface was much more complex in comparison with 80 A and 120 A cases. The excessive convex defect at the bottom side and the concave defect at the top surface were observed. In the case of 120 A welding current, two convection patterns with the main flow in the backward direction were seen. Almost no welding defect could be found. The interaction between the shear force and Marangoni force played a solid state on the convection and heat transportation processes in the plasma arc welding process.

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