AWS A4.3 : 1993

Personnel (Reaffirmation)
Personnel (Original)
Foreword
List of Tables
List of Figures
1. Scope
2. Units of Measure
3. Preparation of Weld Test Assemblies
   3.1 Test Assembly Dimensions
   3.2 Test Assembly Degassing
   3.3 Test Assembly Cleaning and Weighing
4. Welding Fixture
5. Welding and Preparation for Analysis
   5.1 Preliminary Preparation
   5.2 Welding the Test Assemblies
   5.3 Cleaning and Preparation for Analysis
6. Diffusible Hydrogen Analysis
   6.1 Analytical Apparatus Requirements
   6.2 Loading the Test Specimen into the
       Analytical Apparatus
   6.3 Hydrogen Evolution and Analysis
   6.4 Variants of Hydrogen Evolution
   6.5 Reporting of Results
   6.6 Reference Atmospheric Condition
7. Standard Mercury Displacement Method
   7.1 Safety Precautions
   7.2 Collection of Diffusible Hydrogen
   7.3 Calculations
8. Standard Gas Chromatography Method
Appendix (Informative) - Guide to Standard Methods for
                         Determination of the Diffusible
                         Hydrogen Content of Martensitic,
                         Bainitic, and Ferritic Steel Weld
                         Metal Produced by Arc Welding
AWS Filler Metal Specifications and Related Documents

Specifies a standard weld test assembly, a standard method of test specimen preparation, and two standard methods of analysis for determination of diffusible hydrogen from martensitic, bainitic, and ferritic steel weld metals.