Calculation of the Heat Content of the Electrode Metal Droplet When Applying Power Supplies for Manual Arc Welding with Different Volt-Ampere Characteristic

2015 ◽  
Vol 756 ◽  
pp. 101-104 ◽  
Author(s):  
D.P. Il’yashchenko ◽  
Dmitry A. Chinakhov ◽  
Yu.M. Gotovshchik
Keyword(s):  
Arc Welding ◽  
Heat Content ◽  
Metal Droplet ◽  
Active Surface ◽  
Power Supplies ◽  
Active Surface Area ◽  
Metal Arc Welding ◽  
Manual Arc Welding ◽  
Welding Power Supply ◽  
Electrode Metal

In the paper the authors provide the method for calculating the heat content of the molten electrode metal droplets according to the energy parameters of the power supplies for manual metal arc welding. It was established that the type of the welding power supply has a significant impact upon the temperature, mass and active surface area of the electrode droplets.

Regulating splashing of electrode metal in manual arc welding

2007 ◽  
Vol 21 (2) ◽  
pp. 157-159 ◽  
Author(s):  
I N Vornovitsky ◽  
B V Semendyaev ◽  
M I Kucherova ◽  
D V Arsyukov
Keyword(s):  
Arc Welding ◽  
Manual Arc Welding ◽  
Electrode Metal

Investigation of Fast-Flowing Processes of Heat and Mass Transfer during Arc Welding with a Melting Electrode under Conditions of Laser Coherent Radiation

2018 ◽  
Vol 938 ◽  
pp. 119-123
Author(s):  
Y.N. Saraev ◽  
A.G. Lunev ◽  
A.S. Kiselev ◽  
Anton S. Gordynets ◽  
V.M. Semenchuk
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Arc Welding ◽  
High Speed ◽  
Light Emission ◽  
Video Recording ◽  
Metal Droplet ◽  
Video Cameras ◽  
Video Frames ◽  
Electrode Metal

The results of the development and manufacturing of a unique research complex for investigating fast-flowing processes of heat and mass transfer during arc welding with a melting electrode are presented. The advantages of the developed complex over traditionally used ones are shown using cinema and video cameras by shadowing the image of heat and mass transfer of a metal. Studies of fast processes using high-speed video recording require powerful backlighting, such as a scattered laser beam, which enhances the visualization of the observed object, namely, the process of melting and transferring each electrode metal droplet under conditions of intense light emission from the electric arc. The article contains explanatory diagrams, control algorithms, video frames of a separate welding microcycle, and examples of recorded oscillograms and the graphical representations of the changes in their quantitative values.

Influence of Arc Welding Power Supply on Structural Phase Composition of X12CrNiTi 18-9 (DIN) Weld

2015 ◽  
Vol 770 ◽  
pp. 70-75 ◽  
Author(s):  
D.P. Il’yaschenko ◽  
Dmitry A. Chinakhov ◽  
V.I. Danilov ◽  
G.V. Schlyakhova
Keyword(s):  
Power Supply ◽  
Arc Welding ◽  
Structural Phase ◽  
Austenitic Steels ◽  
Thermal Impact ◽  
Impact Zone ◽  
Fine Grained ◽  
Manual Arc Welding ◽  
Fine Grained Structure ◽  
Welding Power Supply

The paper presents the results of studies improve efficiency of manual arc welding of austenitic steels. It is in arc welding of austenite steels the use of inverter power supply furthers obtaining more fine-grained structure of added metal and thermal impact zone, shortens thermal impact zone; that improves corrosion resistance of joint weld.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

Sign in / Sign up

Export Citation Format

Share Document