Study on the Arc Shape in the Wire Arc Spray Process

2010 ◽  
Vol 154-155 ◽  
pp. 109-112
Author(s):  
Jia Ying Zhang ◽  
Bin Shi Xu
Keyword(s):  
High Speed ◽  
Short Circuit ◽  
Digital Camera ◽  
Wire Arc Spray ◽  
Properties Of Coatings ◽  
Spray Process ◽  
Arc Spray ◽  
Arc Shape ◽  
The Wire ◽  
Metal Wires

Being the heat source of arc spray, the characteristics of arc are of importance for properties of coatings. In this paper, the arc shape in the wire arc spray process was analyzed in the aid of high-speed digital camera. It is testified that the arc has the elliptical shape. This type of shape is favorable for heating the metal particles. The arc isn’t always in burning state and it is extinguished frequently. There are two kinds of reasons for arc extinguish. The first one is that the two metal wires short circuit. The second one is that the imperfect melted metal stretches the arc long, and then this part melted and broken away from the metal wires’ tips. If we can control the metal wires state, the properties of coatings will be improved.

Diagnostic Development for Control of Wire-Arc Spraying

1997 ◽  
Author(s):  
J. Sheard ◽  
J. Heberlein ◽  
K. Stelson ◽  
E. Pfender
Keyword(s):  
Molten Metal ◽  
High Speed ◽  
Metal Droplet ◽  
Arc Spraying ◽  
Voltage Fluctuations ◽  
Arc Voltage ◽  
Spray Process ◽  
Arc Spray ◽  
Labview Software ◽  
The Wire

Abstract This research has focused on characterization of the wire arc spray process with the goal of achieving improved process controls. Arc voltage and current traces have been analyzed on-line using an oscilloscope and a personal computer with LabView software. The characteristic features of the arc voltage fluctuations are correlated with the molten metal droplet formation process using a high speed Laser Strobe video system operating in synchronization with the oscilloscope trigger. Voltage minima occur when larger globules of molten metal leave the wire tip. Analysis of the voltage fluctuations indicate that they are neither random nor periodic, and that they can be described based on chaos theory. This approach may be used for achieving a further understanding of the dynamic nature of the process, and for the development of control algorithms.

Investigation about the Chrome Steel Wire Arc Spray Process and the Resulting Coating Properties

2007 ◽  
Vol 16 (5-6) ◽  
pp. 759-767 ◽  
Author(s):  
J. Wilden ◽  
J. P. Bergmann ◽  
S. Jahn ◽  
S. Knapp ◽  
F. van Rodijnen ◽  
...  
Keyword(s):  
Steel Wire ◽  
Wire Arc Spray ◽  
Coating Properties ◽  
Chrome Steel ◽  
Spray Process ◽  
Arc Spray

Investigations of Arc Behavior and Particle Formation in the Wire Arc Spray Process Using High Speed Photography

2000 ◽  
Author(s):  
N.A. Hussary ◽  
J. Heberlein
Keyword(s):  
Thermal Spray ◽  
High Speed ◽  
Imaging System ◽  
Metal Droplet ◽  
Droplet Formation ◽  
Operating Conditions ◽  
Arc Spraying ◽  
High Speed Photography ◽  
Spray Process ◽  
The Wire

Abstract The wire arc spraying process, one of several thermal spray processes, gained a sizable part of the thermal spray market, however, more control is needed for this process to be used for high precision coatings. This study is aimed at investigating the liquid metal droplet formation process in order to identify methods for droplet trajectory control. A high speed Kodak imaging system has been used to observe the droplet formation for different operating conditions. Decreasing the upstream pressure and the current levels lead to the reduction in the asymmetric melting of both anode and cathode. By decreasing the interactions of the large eddy structures with the formed metal agglomerates one can achieve better control of the particle trajectories and jet divergence. Thus, coatings can be obtained with higher definition and improved reliability.

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