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AWS A4.3 Document Information:
Title
Standard Methods for Determination of the Diffusible Hydrogen Content of Martensitic, Bainitic, and Ferritic Steel Weld Metal Produced by Arc Welding
American Welding Society
Publication Date:
Jan 1, 1993
Scope:
This standard prescribes 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. The methods
of preparation are suitable for shielded metal arc, gas metal arc,
flux cored arc, and submerged arc welding processes. Extension of
the methods of preparation to other processes, such as gas tungsten
arc or plasma arc welding, are possible.
It is not the intent of this standard directly herein to
classify arc welding electrodes, fluxes, and gases according to the
hydrogen content of welds produced from them. However, it is the
intent of this standard that it be used as the standard test method
for classification purposes to be referenced in individual filler
metal specifications prepared by the AWS Committee on Filler Metal
and its subcommittees.
In addition to its use for electrode classification purposes, it
is the intent of this standard that it be used for quality
conformance testing of arc welding electrodes, fluxes, and
gases.
It is recommended that this standard be used for developing and
reporting research results so that the results may be directly
compared with those from other laboratories.
For purposes of electrode classification and quality conformance
testing, any requirement established based on the use of this
standard must also be based on a reference atmospheric condition.
If a reference condition is not specified in conjunction with
diffusible hydrogen requirements in the individual consumable
standards, the recommended reference condition in 6.6 shall be
used.
Keywords:
- Diffusible hydrogen
- gas chromatography
- mercury displacement
- arc welding
- steel
- shielded metal arc welding
- gas metal arc welding
- flux cored arc welding
- submerged arc welding
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