TECHICAL Series MATHEMATICS • INFORMATICS • PHYSICS Series PHILOLOGY Series ECONOMIC SCIENCES Sereies EDUCATIONAL SCIENCES Series LAW AND SOCIAL SCIENCES Series
Stainless Steel and Welding Fume
(Otelurile aliate si vaporii de sudare)
Vol LXI • No. 1/2009
Cristiana Rizescu, Stoian Elena Valentina, Ionită Gheorghe
Universitatea Valahia din Târgoviste, Bulevardul Unirii Nr.18-20, Târgoviste, România
e-mail: valicirstea@yahoo.com

 Keywords   Hexavalent chromium, crom, nichel, mangan, silica, beriliu, cadmiu, oxizi, compusi de
fluor, cobalt, cupru, plumb, selenium, zinc, respirable fraction of particles, toxic gases may.

 Abstract
Welding "smoke" is a mixture of very fine particles (fumes) and gases. Many of the substances in welding smoke, such as chromium, nickel, arsenic, asbestos, manganese, silica, beryllium, cadmium, nitrogen oxides, phosgene, acrolein, fluorine compounds, carbon monoxide, cobalt, copper, lead, ozone, selenium, and zinc can be extremely toxic. Welding fume is a mixture of airborne fine particles. Toxic gases may also be generated during welding and cutting. More than 90% of the fume arises from vaporisation of the consumable electrode, wire or rod as material is transferred across the arc or flame. The range of welding fume particle size is shown in relation to more familiar types of dust and fume. The respirable fraction of particles (especially less than 3μm) are potentially more harmful as they can penetrate to the innermost parts of the lung. Various gases and fumes can be generated during welding. Welding fumes are metal-containing aerosols consisting of particles formed through complex vaporisation-condensation-(oxidation) or vaporisation-(oxidation)-condensation processes during welding. The fumes are therefore complex in their composition and their structure.

 Rezumat
"Fumul" de sudare este un amestec de particule foarte fine (vapori/aburi) şi gaze. Majoritatea substanţelor din fumul de sudare, precum CROM, nichel, azbest, mangan, silica, beriliu, CADMIU, oxizi de azot, fosgen, acroleina, compuşi de fluor, monoxid de carbon, COBALT, CUPRU, PLUMB, ozon, selenium şi ZINC pot fi extreme de toxici. Vaporii de sudare sunt un amestec de particule fine în suspensie. Gazele toxice pot fi generate de asemenea în timpul sudpării şi tăierii. Mai mult de 90% din vapori apar din vaporizarea electrozişlor consumabili, sârmă sau tijă întrucât materialul este transferat de-a lungul arcului sau flăcării. Domeniul de mărime a particulelor de vapori de sudare este arătat in raport cu mai multe tipuri de praf şi vapori. Fracţia respirabilă a particulelor (în special mai mici decât 3μm ) sunt potenţial mai dăunătoare deoarece ele pătrund în cele mai adânci părţi ale plămânului. Diverse gaze şi vapori pot fi generate în timpul sudării. Aburii de sudare sunt aerosoli - particule fine dispersate ca un atomizer de particule fine, conţinând metale constând în particule formate printr-un proces complex de condensare-vaporizare (oxidare) sau vaporizare -(oxidare)- condensare în timpul sudării. Aburii sunt prin urmare complecși în compoziţia şi structura lor.



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