FAQ Rumore
Calculation of the protective equipment
for welding as a function of the distance
developed by Andrea Bogi, Nicola Stacchini, Iole Pinto -
"USL Toscana Sudest" Tuscany Agency- Public Health Laboratory of Siena
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USER GUIDE SHOW AN EXEMPLE GMAW_MIG (200 A) PERFORM CALCULATION |
* Effective irradiance measured values
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Choose the PPE graduation for welding EN 169 
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Choose the PPE graduation for ultraviolets EN 170 (1992)
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| not attenuated | UNI EN 169 | UNI EN 170 | |||
| UV (S) [W/m2] | |||||
| Percentage of ELV [%] | |||||
| Max time of exposure [sec] | |||||
| UVA [W/m2] | |||||
| Percentage of ELV [%] | |||||
| Max time of exposure [sec] | |||||
| Blu [W/m2] | |||||
| Percentage of ELV [%] | |||||
| Max time of exposure [sec] |
For exposure times above c seconds it is necessary to protect also the skin
SYSTEM TABLES
| EN 169 - welding - transmission requirements | |||||
| current | shade number | t-313 | t-365 | tv | tA 780-1400 |
| 1.2 | 0.00030 | 50 | 90 | 69 | |
| 1.4 | 0.00030 | 35 | 65 | 52 | |
| 1.7 | 0.00030 | 22 | 50 | 40 | |
| 2 | 0.00030 | 14 | 35 | 28 | |
| 2.5 | 0.00030 | 6.4 | 24 | 15 | |
| 3 | 0.00030 | 2.8 | 13 | 12 | |
| 4 | 0.00030 | 0.95 | 6 | 6.4 | |
| 5 | 0.00030 | 0.3 | 2.2 | 3.2 | |
| 6 | 0.00030 | 0.1 | 0.8 | 1.7 | |
| 7 | 0.00030 | 0.05 | 0.3 | 0.81 | |
| 8 | 0.00030 | 0.03 | 0.08 | 0.43 | |
| 5-20 | 9 | 0.00030 | 0.01 | 0.04 | 0.2 |
| 20-40 | 10 | 0.00030 | 0.01 | 0.02 | 0.1 |
| 40-100 | 11 | 0.00030 | 0.00320 | 0.00600 | 0.05 |
| 100-175 | 12 | 0.00030 | 0.00120 | 0.00220 | 0.03 |
| 175-250 | 13 | 0.00030 | 0.00044 | 0.00080 | 0.01 |
| 250-400 | 14 | 0.00016 | 0.00016 | 0.00030 | 0.01 |
| 15 | 0.00006 | 0.00006 | 0.00011 | 0.00300 | |
| 16 | 0.00002 | 0.00002 | 0.00004 | 0.00300 | |
| EN 170 - Shade number of UV absorbing filters | |||||
| shade number | t-313 | t-365 | tv | ||
| 2 – 1,2 | 0.0003 | 0.3 | 88 | ||
| 2 – 1,4 | 0.0003 | 0.3 | 65 | ||
| 3 – 1,2 | 0.0003 | 50 | 88 | ||
| 3 – 1,4 | 0.0003 | 35 | 62 | ||
| 3 – 1,7 | 0.0003 | 22 | 50 | ||
| 3 – 2 | 0.0003 | 14 | 35 | ||
| 3 – 2,5 | 0.0003 | 6.4 | 24 | ||
| 3 – 3 | 0.0003 | 2.8 | 13 | ||
| 3 – 4 | 0.0003 | 0.95 | 5.8 | ||
| 3 – 5 | 0.0003 | 0.3 | 2.2 | ||
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