نتایج جستجو برای: welding fume

تعداد نتایج: 17135  

Journal: :British journal of industrial medicine 1981
A P Freedman S E Robinson K O'Leary L Goodman J M Stellman

Magnetopneumography was used to measure non-invasively the concentration of the ferrimagnetic fraction of retained welding fume in the thoraces of steel arc welders. This was done by measuring the remanent magnetic fields due to ferrimagnetic particles. The 11 welders studied had concentrations of thoracic ferrimagnetic mineral several orders of magnitude greater than three machinists, 16 forme...

Journal: :Occupational medicine 2009
Zeeba Loukzadeh Seyed Akbar Sharifian Omid Aminian Ahmad Shojaoddiny-Ardekani

BACKGROUND Spot welding is a type of resistance welding in which pieces of metals are pressed together and an electric current is passed through them. Spot welders are at risk of contact with some potentially hazardous agents but there are few studies about the respiratory effects of spot welding. AIMS Our objective was to study lung function and respiratory symptoms among spot welders and of...

Journal: :Industrial health 2005
Takeshi Iwasaki Yuki Fujishiro Yuji Kubota Jun Ojima Nobuyuki Shibata

Recently, open-type push-pull ventilation systems have been widely employed as effective substitutes for the conventional local exhaust ventilation system, and have prevailed at many welding workshops in Japan. In this study, the effect of the uniform velocity on carbon dioxide (CO2) shielding arc welding was examined by laboratory experiments. The ventilation system examined in the experiments...

2010
Mansour Ahmed Balkhyour Mohammad Khalid Goknil

Welding is a major industrial process used for joining metals. Occupational exposure to welding fumes is a serious occupational health problem all over the world. The degree of risk to welder's health from fumes depends on composition, concentration, and the length of exposure. The aim of this study was to investigate workers' welding fume exposure levels in some industries in Jeddah, Saudi Ara...

2016
Bor-Cheng Han I-Jung Liu Hsiao-Chi Chuang Chih-Hong Pan Kai-Jen Chuang

Welding fume exposure is associated with heart rate variability (HRV) reduction. It is still unknown whether respirator can reduce effect of welding fume on HRV among welding workers in a shipyard. We recruited 68 welding workers with respirator and 52 welding workers without respirator to measure HRV indices, including standard deviation of normal-to-normal intervals (SDNN) and square root of ...

Journal: :Toxicological sciences : an official journal of the Society of Toxicology 2001
I J Yu K S Song H K Chang J H Han K J Kim Y H Chung S H Maeng S H Park K T Han K H Chung H K Chung

To investigate the disease process of pneumoconiosis induced by welding-fume exposure, a lung fibrosis model was established by building a stainless steel arc welding fume generation system and exposing male Sprague-Dawley rats for 90 days. The rats were exposed to welding fumes with concentrations of 57-67 mg/m3 (low dose) and 105-118 mg/m3 (high dose) total suspended particulates for 2 h per ...

Journal: :British journal of industrial medicine 1979
P L Kalliomäki S Sutinen V Kelhä E Lakomaa V Sortti

This study describes various post-mortem examinations of the lungs of a shipyard arc welder. These investigations comprised morphological methods, including gross pathology and radiography, histological and ultrastructural examinations, chemical analysis of lung tissue, and sensitive magnetic measurements, which can now be used to detect magnetic contaminants, such as welding fume, in human tis...

Journal: :Journal of environmental monitoring : JEM 2007
A Dale Marcy Pamela L Drake

Workers who perform routine welding tasks are potentially exposed to fume that may contain manganese. Manganese may cause respiratory problems and is implicated in causing the occurrence of Parkinson-like symptoms. In this study, a field colorimetric method for extracting and measuring manganese in welding fume was developed. The method uses ultrasonic extraction with an acidic hydrogen peroxid...

Journal: :Human pathology 2002
Mindy J Hull Jerrold L Abraham

Chronic exposure to high concentrations of fumes during aluminum arc welding causes a severe pneumoconiosis characterized by diffuse pulmonary accumulation of aluminum metal and a corresponding reduction in lung function. Aluminum fume-induced pneumoconiosis is a rarely reported entity, of which the true incidence is unknown. We report the clinical, radiographic, microscopic, and microanalytic ...

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