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KMID : 0895420020120010007
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Journal of Korean Society of Occupational and Enviromental Hygiene
2002 Volume.12 No. 1 p.7 ~ p.17
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Welding Fumes, Metal Exposures, and Metal Contents Of Gas Metal Arc Welding in the Heavy Construction Machinery Shop
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Abstract
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This study was conducted on the heavy construction machinery shop in Ulsan city from january to June, 2000. Study factors were welding positions, welding currents, and helmet to arc distances, and exposure variables were welding fumes, metals(iron, manganese, copper), and metal contents. The results of this study are summarized up as follows.
Exposure concentrations of welding fumes, iron, copper, and manganese by the working positions were 8.63㎎/㎥(p＜0.05), 3.72㎎/㎥(p＜0.05), 0.05㎎/㎥(p＜0.05), and 0.73㎎/㎥(p＜0.05) respectively. Exposure concentrations of welding fumes, iron, copper, and manganese were affected by the welding positions.
Percentages of iron, copper, and manganese to welding fumes were 43.66%, 0.53%, and 8.55%(p＜0.05) respectively. The highest exposure concentration of welding fumes, iron, copper, and manganese.
The highest percentages of iron, copper, and manganese to welding fumes by the welding currents were 45.13% in 251-300 ampere, 0.56% in 251-300 ampere, and 8.85% below 250 ampere respectively but here were no significant differences(p＜0.05). Considering this results in gas metal arc welding, percentages of iron, copper, and manganese to welding fumes were not affected by the welding currents.
Relationships of welding currents with exposure concentrations of welding fumes, iron, copper, and manganese were positive and correlation coefficients were 0.818(p＜0.05), 0.769(p＜0.05), 0795(p＜0.05), and 0.716(p＜0.05) respectively.
The highest exposure concentrations of welding fumes, copper, and manganese by the helmet to arc distances were 15.81㎎/㎥(p＜0.05) below 40㎝, 6.93㎎/㎥(p＜0.05) below 40㎝, and 1.18㎎/㎥(p＜0.05) below 40㎝ respectively. Considering this results in gas metal arc welding, closer helmet to are distances will be resulted in higher exposure concentrations of welding fumes, iron, copper, and manganese.
The highest percentages of ron, copper, and manganese to welding fumes by the helmet to arc distances were 44.33% in but there were no significant differences(p＜0.05). Considering this result in gas metal arc welding with th erange of helmet to arc distances, the percentages of ron, copper, and manganese to welding fumes were not affected by the helmet to arc distances.
Relationships of helmet to arc distances with exposure concentrations of welding fumes, iron, copper, and manganese were negative and correlation coefficients were -o.695(p＜0.05), 0.677(p＜0.05), -0.678(p＜0.05), and -0.630(p＜0.05) respectively.
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