Properties and Behaviour of MMA Welding Slag

1990 ◽  
Vol 22 (1) ◽  
pp. 8
Author(s):  
S. Bhattacharya
Keyword(s):  
Mma Welding ◽  
Welding Slag

Microstructure of the Acid Welding Slag

2012 ◽  
Vol 249-250 ◽  
pp. 914-917
Author(s):  
Yuan Bin Zhang ◽  
Kai Zhang
Keyword(s):  
Electron Microscope ◽  
Amorphous Matrix ◽  
Low Carbon Steel ◽  
Optical Microscope ◽  
Crystal Phase ◽  
Low Carbon ◽  
Extrusion Press ◽  
Transmission Electron ◽  
Welding Slag ◽  
Welding Electrode

Several E4303 type welding electrodes with different coating compositions were designed and manufactured using TL-25 welding electrode extrusion press. Welding slags of these electrodes were collected after welding on the low carbon steel, then the microstructure and the phase constitutes of the slags were investigated by optical microscope,scan electron microscope (SEM), electron probe microanalyzer (EPMA), Transmission electron microscope (TEM) and X-ray diffraction (XRD). It was indicated that the slags were mainly composed of amorphous matrix and Fe2MnTi3O10 crystal phase. Fe, Mn and Ti were the main elements to form the crystal phase, while Si, Al and Ca were mostly distributed in the amorphous matrix. The formation of the crystal phase in the slag could be controlled by adjusting the amount and the proportion of Fe, Mn and Ti in the welding rod coating.

scholarly journals RESEARCH OF SEAM DIMENSIONAL DEPENDENCE ON THE SHORT-CIRCUIT CURRENT IN MMA WELDING PROCESS / SIŪLĖS MATMENŲ PRIKLAUSOMYBĖS NUO TRUMPOJO JUNGIMO SROVĖS STIPRIO TYRIMAS, VIRINANT GLAISTYTAISIAIS ELEKTRODAIS

2013 ◽  
Vol 5 (6) ◽  
pp. 659-663
Author(s):  
Mindaugas Rimkus ◽  
Ivanas Višniakas ◽  
Česlovas Kazakevičius
Keyword(s):  
Arc Welding ◽  
Drop Size ◽  
Short Circuit ◽  
Welding Process ◽  
Short Circuit Current ◽  
Mma Welding ◽  
Metal Drop ◽  
Dimensional Dependence ◽  
Ridge Height ◽  
Weld Depth

In this article the changes of seams properties of steel S235J2(LST EN 10025:2004) were analyzed, produced by welding withdifferent technology are discussed. Samples were welded byhand arc welding, using AV-23 and AV-66 welding electrodes.The welded seams were made by changing short-circuit current.The duration of weld depth, ridge height, metal drop size, metaldrop frequency, short-circuit time and short-circuit current valueare determinated.The results of the research are given in graphs,final conclusions are also written. Santrauka Straipsnyje tiriami mažaanglio plieno S235J2 (LST EN 10025:2004) virintinių siūlių matmenų pokyčiai, apvirinant plieną skirtingais glaistytaisiais elektrodais įvairiais suvirinimo režimais. Tyrimų metu buvo naudojami AV-23 ir AV-66 glaistytieji elektrodai ir keičiamas trumpojo jungimo srovės stipris. Nustatytas ryšys tarp metalo įvirinimo gylio, rumbelės aukščio, išlydytų lašų dydžio ir kiekio, trumpojo jungimo trukmės ir srovės dydžio. Gauti tyrimų rezultatai, nubraižyti priklausomybių grafikai ir pateiktos išvados.

scholarly journals Welding Slag Clear Machine with Kinematic Linkage Indexer

2014 ◽  
Vol 16 (4) ◽  
pp. 65-68
Author(s):  
Akshay Mahale ◽  
◽  
Madhavrao Londhe ◽  
A. J Patil
Keyword(s):  
Welding Slag

Evaluation of HAZ Hardness in MMA Welding*

2014 ◽  
Vol 56 (10) ◽  
pp. 863-868
Author(s):  
Marius Bodea ◽  
Liviu Brânduşan ◽  
Radu Mureşan
Keyword(s):  
Mma Welding

Design on Cleaning Device for Slag of Narrow Gap Submerged Arc Welding

2013 ◽  
Vol 470 ◽  
pp. 404-407
Author(s):  
Wen Ming Zhang ◽  
Xiao Xu Li ◽  
Bin Wang
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Narrow Gap ◽  
Time Saving ◽  
Slag Removal ◽  
High Efficient ◽  
Cleaning Device ◽  
Welding Slag ◽  
Submerged Arc

At present, the Narrow Gap Submerged Arc Welding is an advanced welding technology. As the weld is very deep and narrow, the slag is difficult to clean and will have impact on the quality of welding seam. Therefore, a new kind of narrow gap submerged arc welding slag cleaning device is designed to clean the welding slag. It is consisted of welding walking tractor, height adjuster, slag masher, slag cleaner and slag collector. The narrow gap submerged arc welding slag removal device used for the welding process can realize the cleaning that manpower cannot finish. It is a kind of time-saving, energy-saving and high efficient welding cleaning method.

Influence of Addition of Fe2O3 and CaO on the Performance of Manual SHS Welding Slag

2016 ◽  
Vol 697 ◽  
pp. 741-744
Author(s):  
Zhi Zun Li ◽  
Feng Qi Han ◽  
Li Ming Sun ◽  
Xiao Feng Han ◽  
Wen Tong Xin
Keyword(s):  
Weld Metal ◽  
Mechanical Performance ◽  
Combustion Velocity ◽  
Second Phase ◽  
Metal Analysis ◽  
Solidification Temperature ◽  
Metallic Inclusions ◽  
The Matrix ◽  
Welding Slag ◽  
Adiabatic Combustion Temperature

Fe2O3、CaO have been added into the combustion system of manual SHS welding as slagging elements and the effects of their addition have been studied. Results showed that the combustion velocity and the adiabatic combustion temperature both became lower as the amount of the additives increased. The additives have dropped the density and the solidification temperature of the slag, which accelerated the separation of the slag and gas from the weld pool. (0.2~2.0) g of Fe2O3 and (0.2~1.2) g of CaO have been added into the rod. Experiments showed that the appropriate added amounts of Fe2O3 and CaO for each combustion weld rod were 1.2g and 0.6g respectively. The weld slag was honeycomb, brittle and easy to be removed from the weld metal. Analysis of the microstructure and composition showed that the matrix of the weld slag was glass, with some ceramics distrabuting on it. The ceramics had high content of Al2O3, which was created in the combustion reaction. The matrix of the weld alloy was α-Cu solid solution, on which a second phase with high content of Fe precipitated. There were no non-metallic inclusions in the weld metal ultimately. The weld joint had favorable mechanical performance, which tensile strength reached 400MPa, that fulfil the requirement of emergency welding.

scholarly journals Assessing MMA Welding Process Stability Using Machine Vision-Based Arc Features Tracking System

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 84
Author(s):  
Wojciech Jamrozik ◽  
Jacek Górka
Keyword(s):  
Tracking System ◽  
Welding Process ◽  
Reference Value ◽  
Complementary Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Mma Welding ◽  
Arc Length ◽  
Process Stability ◽  
Geometrical Properties ◽  
Arc Voltage

Arc length is a crucial parameter of the manual metal arc (MMA) welding process, as it influences the arc voltage and the resulting welded joint. In the MMA method, the process’ stability is mainly controlled by the skills of a welder. According to that, giving the feedback about the arc length as well as the welding speed to the welder is a valuable property at the stage of weld training and in the production of welded elements. The proposed solution is based on the application of relatively cheap Complementary Metal Oxide Semiconductor (CMOS) cameras to track the welding electrode tip and to estimate the geometrical properties of welding arc. All measured parameters are varying during welding. To validate the results of image processing, arc voltage was measured as a reference value describing in some part the process stability.

Exposure to Solid Aerosols During Regular MMA Welding and Grinding Operations on Stainless Steel

AIHAJ ◽  
1994 ◽  
Vol 55 (12) ◽  
pp. 1149-1153 ◽  
Author(s):  
Jan T. Karlsen ◽  
Torgrim Torgrimsen ◽  
Sverre Langård
Keyword(s):  
Stainless Steel ◽  
Mma Welding ◽  
Grinding Operations
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