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Document ID (ISN)31838
CIS number 79-1268
ISBN(s) 91-7464-029-1
Year 1978
Convention or series no.
Author(s) Jansson L.
Title Determination of collection efficiency - Particle size distributions and concentrations during welding with and without different local exhausts, and performance of some collectors and ventilation systems
Original title Bestämning av infångningsförmåga - Partikelstorleksfördelningar och -koncentrationer vid svetsning med och utan olika punktutsug samt funktion hos några avskiljare och ventilationssystem [in Swedish]
Bibliographic information Arbete och hälsa - Vetenskaplig skriftserie 1978:18, Arbetarskyddsverket, Fack, 100 26 Stockholm, Sweden, Oct. 1978. 86p. Illus. 11 ref.
Abstract Collection efficiencies were determined for 15 different types of local exhausts. The air flows were 40-1000m3/h. 7 of the exhausts were tested with 2 air flows and in different locations. The tests were carried out in an air-conditioned room with constant particle concentration. Different electrodes were used, and the particle numbers were determined with and without exhaust in 10 size stages from 0.01 to 1µm and in 5 stages from 0.5 to 10µm. The collection efficiencies for arc welding were 97-99% for particles 0.1-1.4µm, but were lower for shielded-arc welding. Exhausts or welding guns had 70-90% efficiencies. The flow rates for these exhausts were limited by shielding gas requirements. There was a slight tendency for increasing efficiency with increasing particle size. 3 welding workshops with different air inlet systems had particle concentrations and size distributions similar to the test room without local exhaust. 5 welding fume filters gave increasing efficiencies with increasing particle size; efficiencies ranged from 86-99.99% for particles 0.1-0.18µm to 99.0-99.99% for particles 0.56-1.0µm.
Descriptors (primary) particle size distribution; number concentration; collection efficiency; arc welding and cutting; welding fumes; local exhaust
Descriptors (secondary) shielded-arc welding; manual arc welding; comparative study; filter dust collectors; metalworking industry; evaluation of equipment
Document type E - Books, reports, proceedings
Subject(s) Dust, aerosols and related diseases
Broad subject area(s)
Browse category(ies) Welding and cutting