Manual plasma welding of aluminum with a reverse-polarity direct current

1979 ◽  
Vol 15 (11) ◽  
pp. 872-872
Author(s):  
A. A. Sychev ◽  
K. I. Belova
Keyword(s):  
Direct Current ◽  
Plasma Welding ◽  
Reverse Polarity ◽  
Manual Plasma

Improvement of Arc Properties in GTAW of Aluminium Alloys

2019 ◽  
Vol 970 ◽  
pp. 115-122
Author(s):  
Aleksey S. Kiselev ◽  
Anton S. Gordynets ◽  
Mikhail S. Slobodyan
Keyword(s):  
Direct Current ◽  
Welding Process ◽  
Alternating Current ◽  
Spatial Position ◽  
Reverse Polarity ◽  
Tungsten Electrode ◽  
Square Wave ◽  
Gas Tungsten Arc ◽  
Control Optimization ◽  
Wide Range

Gas tungsten arc welding (GTAW) is a widely used method of joining aluminium and its alloys. Despite the fact that a lot of research has been done in this area for several decades, there are many unresolved issues on the welding process control. Optimization of square wave alternating current profiles is one of them. This paper presents the results of studies on control of spatial position of an arc by an improved heat input algorithm taking into account the necessary relationship between direct current of straight and reverse polarity. It is shown that an increase in direct current reverse polarity to over 10 A contributes to expansion of a cathode spots space and, consequently, a greater deviation of the arc from the axis of a tungsten electrode. The spatial position of the arc is almost coaxial to the tungsten electrode when direct current reverse polarity is short-term reduced to 5 A at the final stage. These results are correct for a wide range of the square wave alternating current profiles.

Plasma Welding of Aluminum Alloys with the Use of Two Direct ARCS on Reverse-Polarity Current

Metallurgist ◽  
2016 ◽  
Vol 59 (11-12) ◽  
pp. 1234-1237 ◽  
Author(s):  
Yu. D. Shchitsyn ◽  
D. S. Belinin ◽  
V. Yu. Shchitsyn ◽  
S. D. Neulybin
Keyword(s):  
Aluminum Alloys ◽  
Plasma Welding ◽  
Reverse Polarity

scholarly journals Plasma welding of aluminum alloys when two arc plasma torch at current reverse polarity

2015 ◽  
pp. 61-70
Author(s):  
Iuri Shchitsyn ◽  
Ivan Gilev ◽  
Dmitrii Belinin ◽  
Sergei Neulybin ◽  
Aleksandr Bazhenov
Keyword(s):  
Aluminum Alloys ◽  
Plasma Torch ◽  
Arc Plasma ◽  
Plasma Welding ◽  
Reverse Polarity ◽  
Arc Plasma Torch

Manual plasma welding of VT1-0 titanium

1988 ◽  
Vol 24 (6) ◽  
pp. 323-326
Author(s):  
A. A. Sychev ◽  
R. M. Lobkovskaya ◽  
O. V. Ponomarev
Keyword(s):  
Plasma Welding ◽  
Manual Plasma

Investigation of mechanical properties of Al6061-T6 alloy by EAFSW with straight and reverse polarity of direct current

2020 ◽  
Author(s):  
Ivy Das Chowdhury ◽  
Kaushik Sengupta ◽  
Dilip K. Singh ◽  
Abhijit Daskarmakar ◽  
Swapna Roy ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Direct Current ◽  
Reverse Polarity

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

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