Effect of arc breaks and short circuits on lack of fusion formation at sidewalls of groove during multi-pass weaving of pipelines

2021 ◽  
pp. 343-347
Author(s):  
A.E. Filyakov
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Lack Of Fusion ◽  
Arc Power ◽  
Side Walls ◽  
Short Circuits ◽  
Arc Welding Process ◽  
Short Time ◽  
Transverse Oscillations

To evaluate the effect of the short-time arc breaks along the side-walls of grove during multi-pass welding virtual study of this effect is performed using deterministic mathematical model of arc welding process. It is established that breaks in arc burning lead to the appearance of craters, which may not be remelted during the subsequent pass. It is shown that the effect of the duration of the arc breaks on the craters depth increases with increase in the amplitude and period of oscillations. The effect of breaks is more noticeable if they occur when approaching the groove face than if they occur when moving from the groove face to the center of the pass. When analyzing the welding monitoring data, it is necessary to take into account not only the arc power, but also the parameters of transverse oscillations of the torch, including the phase of arc breaks relative to these oscillations.

Development of Exothermic Flux for Enhanced Penetration in Submerged Arc Welding

2020 ◽  
Vol 19 (01) ◽  
pp. 131-146
Author(s):  
Aditya Kumar ◽  
Kulwant Singh
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Graphical Form ◽  
Welding Parameters ◽  
Weld Penetration ◽  
Agglomeration Process ◽  
Arc Welding Process ◽  
Submerged Arc

An exothermic flux for submerged arc welding process has been developed which is capable of enhancing weld penetration of the joint. For this purpose, thermit mixture in different proportions (20% and 40%) has been added to the parent flux by agglomeration process. Beads on plate were deposited using parent and developed exothermic fluxes for a comparative study. EH14 filler wires in combination with parent and exothermic fluxes were used in this investigation. The effects of welding parameters and exothermic flux on weld penetration were investigated and the results have been presented in this paper. It has been found that the penetration increases from 2.95 to 3.51[Formula: see text]mm with 40% thermit mixture addition to the parent flux. It is further observed that penetration increases with increase in the amount of thermit mixture added. A mathematical model has been developed to predict weld penetration or select suitable welding parameters to obtain the desired penetration. The significance of coefficients was tested using Student’s [Formula: see text]-test and the adequacy of developed model was tested using [Formula: see text]-test. The effects of various parameters on penetration have been presented in graphical form for better understanding.

scholarly journals A Study on On-line Mathematical Model to Control of Bead Width for Arc Welding Process

2017 ◽  
Vol 174 ◽  
pp. 68-73 ◽  
Author(s):  
Joon Sik Son ◽  
Jong-Pyo Lee ◽  
Min-Ho Park ◽  
Byeong-Ju Jin ◽  
Tae-Jong Yun ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Bead Width ◽  
On Line ◽  
Arc Welding Process

A mathematical model of the submerged-arc welding process and phenomena in the arc cavity

2013 ◽  
Vol 27 (8) ◽  
pp. 629-637 ◽  
Author(s):  
V.A. Sudnik ◽  
V.A. Erofeev ◽  
A.V. Maslennikov ◽  
D.V. Slezkin ◽  
R.V. Tsvelev
Keyword(s):  
Mathematical Model ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Arc Welding Process ◽  
Submerged Arc

The Determination of Noxes Emissions in Case of Manual Arc Welding Process with Coated Electrode

2018 ◽  
Vol 69 (7) ◽  
pp. 1826-1829
Author(s):  
Claudiu Babis ◽  
Augustin Semenescu ◽  
Oana Roxana Chivu ◽  
Maria Alina Gligor ◽  
Gabriel Iacobescu ◽  
...  
Keyword(s):  
Production System ◽  
Arc Welding ◽  
Welding Process ◽  
Practical Method ◽  
Machine Building ◽  
Short Exposure ◽  
Metal Bath ◽  
Coated Electrode ◽  
Manual Arc Welding ◽  
Arc Welding Process

The occupational risk assessment of a machine building company must cover each activity and workstation, taking into account each component of the production system (work system), each workload, work equipment and the work environment. This assessment is an extremely complicated and complex issue since the production system of such an enterprise is particularly complex and complicated. Welding assembly is a highly polluting technology process, especially of the atmosphere and soil. The formation of gases in the welding process is the result of burning of the electrodes, powders, forming the molten metal bath and making the weld seam. Welding operators are exposed to smoke and toxic gases resulting from the welding process, which can in many cases be hazardous to health. Many acute intoxications that may be caused by excessive exposure to or short exposure to smoke and gas resulting from the welding process have been studied over time. In the paper are presented the elements of risk related to the welding process and the most widespread occupational diseases that can occur in the ranges of the welding operators. The following are presented the noxious emissions from welding and are determined by a practical method the emission of noxious at welding deposition of a welding sample, using the manual arc welding process with coated electrode.

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