AWS F1.6:2017 pdf download.Guide for Estimating Welding Emissions for EPA and Ventil lation Permit Reporting
This guide outlines four methods of estimating airborne emissions from the arc welding process. This docu-ment does not cover disposal of collected wastes from the welding process, including collected welding fume. Emissions from sources other than the welding consumable (such as zinc oxide from galvanized material) cannot be estimated based upon process or consumable data alone and should be addressed by onsite testing (see 3.3.4). These estimates do not consider gaseous emissions that may be present in welding such as ozone, carbon dioxide, argon, oxides of nitrogen,or other gases.
This standard makes sole use of U.S. Customary Units. Approximate mathematical equivalents in the International Sys-tem of Units (SI) are provided for comparison in parentheses or in appropriate columns in tables and figures.
Work performed in accordance with this standard may involve the use of materials that have been deemed hazardous,and may involve operations or equipment that may cause injury or death. This standard does not purport to address all safety and health risks that may be encountered. The user of this standard should establish an appropriate safety program to address such risks as well as to meet applicable regulatory requirements. ANSI Z49. 1 should be considered when developing the safety program.
3.1.1 Reporting Requirements for the Components of the Welding Fume. Estimating the amounts of the com-ponents of welding fume may not be necessary for reporting, even though the fume may contain materials listed as “Hazardous Air Pollutants" by the EPA [see Clause 2(2)]. Refer to local regulations to determine the applicable thresh-old levels for total emissions or emissions of component materials. Though local regulations vary, if the calculated total emissions from the facility (welding and nonwelding related) are less than the reporting threshold values, estimating the amount of the components of this total may not be required.
See the Safety Data Sheet (SDS) for the welding consumable to determine the reasonable expected components of the fume. If individual component reporting thresholds are higher than the total emissions estimated, then further calcula-tions may not be required.
If reporting is required for the components, estimate the emissions factor by electrode specific method outlined in 3.3.2.Generally, only certain elements are required to be reported. Reportable elements found in some common welding pro-cesses include manganese, chromium, nickel, and copper.
3.2 Emissions Calculations. Each method starts with the equation below. Assuming that all of the welding fume is exhausted from the building by ventilation, the total emissions (in pounds or kilograms of welding fume) can be deter-mined by multiplying the total amount of welding consumables purchased by the emission factor. The emission factor is determined using one of the four methods discussed in 3.3. The total amount of consumables can be estimated based upon purchases over the reporting period (this approach will overestimate the actual amount of consumable deposited as not all of the consumable purchased gets used and deposited).AWS F1.6 pdf download.