Influence of welding processes for underground pipeline repair on welder safety

Nataliia Vasyliv, Yaroslav Semchuk


The object of research is the welder safety during the repair and construction of underground pipelines. It is established that manual electric welding is characterized by significant influence on the human body, since the distance from the place of welding to the welder is 20–30 cm, the temperature in the pillar of the welding arc reaches 6500 K. It is contributes to the allocation in the surrounding space of a significant amount of metal vapor and fine particles (welding aerosol and toxic gases). Theoretical and experimental investigations of the initial part of the welding torch (at a height of 0.4–0.5 m) using manual, semi-automatic welding in the environment of protective gases and welding under a layer of flux have been carried out.

Dependencies for determining axial temperatures and velocities are proposed. It is substantiated that the spreading of aerosols during welding of pipelines in the trench is determined by the physical processes of spreading the welding torch. The hygienic characteristics of the electrodes of the ANO type in the welding processes are investigated. It is established that the total amount of aerosol in the process of welding using ANO-4 electrodes with basic coating reaches 31 g/kg and toxic substances in aerosol up to 9 g/kg. The amount of gases in front of the welder shield during the welding of electrodes by ANO-8 reaches 20 mg/m3.

Empirical equations for determination of aerosols concentration and gaseous concentration of harmful substances are obtained. In addition, an equation for determining the index of workplace pollution of welders, which made it possible to predict individual parameters of working conditions, is obtained.

The mechanism of propagation of aerosols in the trench requires a special consideration, which can be carried out by the method of mathematical modeling, because such physical and chemical processes, as longitudinal and transverse dispersion, molecular diffusion play a role.

The analysis of empirical formulas which can be recommended for determination of parameters in the initial section of a welding torch using flash welding of a pipeline in a trench is done.


welder safety; welding torch; main gas pipelines; convective heat; concentration of aerosol


Hinds, W. C. (1999). Aerosol technology: properties, behavior, and measurement of aiborne particles. A Wiley-Interscience publication, 464.

Vincent, J. H. (2007). Aerosol sampling: science, standarts, instrumentation and applications. Chichtster: John Wiley & Sons Ltd, The Atrium, Southern Cate, 616. doi:

Mandryk, O. M., Tyrlysh, V. V., Mykhailiuk, Yu. D. (2014). Determination of Multifactor Dependencies of Change of Exhaust Gases Composition in Different Modes of Gas Pumping Unit Operation. Scientific Bulletin Al Centrului Universitar Nord Din Baia Mare, XXIX (2), 71–83.

Elterman, V. M., Braude, M. Z. (1965). K voprosu modelirovaniia dvizheniia chastic v konvektivnom potoke vozdukha. Vodosnabzhenie i sanitarnaia tekhnika, 1, 9–12.

Elterman, V. M. (1980). Ventiliaciia khimicheskikh proizvodstv. Moscow: Khimiia, 288.

Pisarenko, V. L., Roginskii, M. L. (1981). Ventiliaciia robochikh mest v svarochnom proizvodstve. Moscow: Mashinostroenie, 120.

Polukarov, Yu. O. (2005). Modeliuvannia pylovoho navantazhennia na orhany dykhannia zvarnyka dlia otsinky ryzyku profesiinoi zakhvoriuvanosti. Kyiv, 140.

Levchenko, O. H., Bulat, A. V., Bezushko, O. M. (2009). Vplyv skladu osnovnoho metalu na hihiienichni kharakterystyky aerozoliv, shcho utvoriuiutsia pry zvariuvanni vysokolehovanykh stalei pokrytymy elektrodamy. Problemy okhorony pratsi v Ukraini, 17, 95–101.

Kurovets, Ya. V., Semchuk, Ya. M. (2011). Modeliuvannia poshyrennia aerozoliv v protsesi ruchnoho zvariuvannia pry remonti ta budivnytstvi liniinoi chastyny mahistralnykh truboprovodiv u polovykh umovakh. Rozvidka i rozrobka naftovykh i hazovykh rodovyshch, 4 (40), 57–62.

Levchenko, O. G. (1996). Processy obrazovaniia aerozolei. Avtomaticheskaia svarka, 4, 17–22.

Grudz, V. Ia., Tymkiv, D. F., Iakovlev, E. I. (1991). Obsluzhivaniia gazotransportnykh sistem. Kyiv, 160.

Taraevs’kyy, O. S. (2010). Maintaining the Reliable Operation of Oil and Gas Pipelines With Account for Mechanochemical Degradation. Technical sessions on welding. Madrid, 28–32.

GOST Style Citations

Copyright (c) 2019 Nataliia Vasyliv, Yaroslav Semchuk

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

ISSN (print) 2664-9969, ISSN (on-line) 2706-5448