AWS F1.2:2013

This document outlines a laboratory method for the determination of fume generation rates and total fume emission. A test chamber is used to collect representative fume samples under carefully controlled conditions.
Scope : 1.1 Introduction. This AWS laboratory test method describes the recommended procedures to be followed in collecting samples for determining the composition and quantity of fume generated during welding and allied processes. The directions for performing the test include such details as the following: (1) Amount of sample to be taken; (2) Filter specifications; (3) Care needed to attain a constant weight during sample handling and storage; (4) Calibration procedure for test equipment to assure satisfactory, comparable, and reproducible data; and (5) Sample calculations. This AWS method is supported by experience and data obtained from cooperative tests. The sampling methods prescribed for breathing zone and general area sampling of fumes for particulate matter are not within the scope of this document. Operator exposure and background sampling methodology are described in detail in AWS F1.1, Guide for Sampling Fumes and Gases Generated by Welding and Allied Processes. 1.2 Purpose 1.2.1 Welding and allied processes produce fumes and gases. The amount or rate generated by a particular process and material depends upon the conditions of use. The laboratory sampling procedure described herein is designed to evaluate the effects of variations in materials, processes, and operating conditions on fume generation rate. Fume generation rates can be useful in prescribing adequate ventilation, making process selections, influencing process variables, and calculating air filtering requirements. In order to provide a safe working environment, it may be necessary to compare the fume generation rate and identify the constituents present in the fumes of various processes. 1.2.2 The samples obtained using the techniques described herein are representative of the fumes present and, if collected on appropriate filters, may be used for fume constituent analyses. 1.2.3 This procedure is designed for a short testing time, normally two minutes or less, which yields useful results that are reproducible within an acceptable range. The method described in this procedure is suitable for use with the majority of welding and allied processes and allows for variation of selected conditions. 1.2.4 Fume generation rate data, if collected in accordance with this procedure, can be correlated to and compared with data from different sources. 1.3 Scope 1.3.1 This method describes a laboratory device and procedure for obtaining representative fume samples and determining fume generation rates of welding and allied processes. 1.3.2 A separate collection procedure for determining fume constituents is described. 1.3.3 A standard set of fume generation test conditions is specified to calibrate the sampling equipment. 1.3.4 Methods for obtaining breathing zone and general area welding fume samples are not within the scope of this standard. 1.3.5 Sampling of gases is not within the scope of this standard. 1.3.6 This standard will be revised as required in accordance with acknowledged technical advancements in the field. 1.3.7 This standard makes sole use of U.S. Customary Units except for measures of mass, fume generation rate, and filter pore size. Approximate mathematical equivalents in the International System of Units (SI) are provided for comparison in parentheses or in appropriate columns in tables and figures. 1.4 Safety. Safety and health issues and concerns are beyond the scope of this standard; some safety and health information is provided, but such issues are not fully addressed herein. Safety and health information is available from the following sources: American Welding Society: (1) ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes (2) AWS Safety and Health Fact Sheets (3) Other safety and health information on the AWS website Material or Equipment Manufacturers: (1) Material Safety Data Sheets supplied by materials manufacturers (2) Operating Manuals supplied by equipment manufacturers Applicable Regulatory Agencies: 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.