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Risk assessment of welding operations and processes in terms of ultrafine particles emissions

2021Book part Open access
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dc.contributor.authorGomes, João
dc.contributor.authorMiranda, Rosa M.
dc.contributor.authorEsteves, Helder M.
dc.contributor.authorAlbuquerque, Paula
dc.date.accessioned2023-05-18T10:40:45Z
dc.date.embargo2025-05-18
dc.date.issued2021
dc.description.abstractWelding is extensively used in metallic construction worldwide, in spite of being able to produce dangerous fumes that may be hazardous to the welder’s health. It is estimated that, presently, 1-2% of workers from different professional backgrounds (which accounts for more than 3 million persons) are subject to welding fume and gas action. Recently, studies have proved the existence of ultrafine particle emissions, from welding processes, thus increasing the health risks to exposed welders. In particular, it was found that the amount of emitted particles (measured by particle number and alveolar deposited surface area) is clearly dependent on the distance to the welding front, and also on the main welding parameters, namely the applied current intensity, heat input, nature of base metal, nature of addition metal, and nature of welding gases used. The emission of airborne ultrafine particles increases with the increase of current intensity as the fume-formation rate does. In regards to welding gas mixtures, higher emissions are observed for more oxidant mixtures, that is, mixtures with a higher CO2 content, which result in higher electric arc stability. These mixtures originate higher concentrations of ultrafine particles (as measured by the number of particles per cm3 of air) and higher values of the alveolar deposited surface area of particles, thus resulting in more severe worker exposure. Combining the obtained data, it is possible to compare different welding processes and operating conditions, in order to assess different levels of welder’s exposure. Also, the graphical representation of measured concentrations of airborne ultrafine particles, with time and distance, allows us to define “safe” and “critical” regions within a welding workshop in terms of welder exposure. This information may be combined with the results of risk analysis derived by control banding and helps to categorize the sites where regulatory measures such as operation containment or dedicated exhaust ventilation need to be implemented.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationGomes JF, Miranda RM, Esteves HM, Albuquerque P. Risk assessment of welding operations and processes in terms of ultrafine particles emissions. New York: Nova Science Publishers; 2021. chapter 7.pt_PT
dc.identifier.doihttps://doi.org/10.52305/HNYO7041pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/16072
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherNova Science Publisherspt_PT
dc.relation.publisherversionhttps://novapublishers.com/shop/risk-management-an-overview/pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectOccupational healthpt_PT
dc.subjectOccupational exposurept_PT
dc.subjectUltrafine particlespt_PT
dc.subjectWelding operationspt_PT
dc.subjectRisk assessmentpt_PT
dc.titleRisk assessment of welding operations and processes in terms of ultrafine particles emissionspt_PT
dc.typebook part
dspace.entity.typePublication
person.familyNameGomes
person.familyNameAlbuquerque
person.givenNameJoão
person.givenNamePaula
person.identifier60203
person.identifier.ciencia-id0212-E6D6-566C
person.identifier.ciencia-id9512-CE2D-AB39
person.identifier.orcid0000-0003-2579-6669
person.identifier.orcid0000-0002-7636-1756
person.identifier.ridL-1465-2013
person.identifier.scopus-author-id56113031900
person.identifier.scopus-author-id57201758122
rcaap.rightsembargoedAccesspt_PT
rcaap.typebookPartpt_PT
relation.isAuthorOfPublicatione44cd72e-bcbb-4612-a274-60cb1915bc0c
relation.isAuthorOfPublicationdc5d92f4-3eb8-47c1-b202-834201ef26bf
relation.isAuthorOfPublication.latestForDiscoverydc5d92f4-3eb8-47c1-b202-834201ef26bf

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