ASTM E749-96
Historical Standard: ASTM E749-96 Standard Practice for Acoustic Emission Monitoring During Continuous Welding
SUPERSEDED (see Active link, below)
1. Scope
1.1 This practice provides recommended guidelines for acoustic emission (AE) monitoring of weldments during and immediately following their fabrication by continuous welding processes. The technique is in a developmental stage and is not used routinely on production welding. Depending on the results of ongoing research and preproduction weld monitoring experience, these procedures are subject to change before routine implementation on production welds.
1.2 The procedure described in this practice is applicable to the detection and location of AE sources in weldments and in their heat-affected zone during fabrication, particularly in those cases where the time duration of welding is such that fusion and solidification take place while welding is still in progress.
1.3 The effectiveness of acoustic emission to detect discontinuities in the weldment and the heat-affected zone is dependent on the design of the AE system, the calibration procedure, the weld process, and the material type. Materials that have been monitored include low-carbon steels, low-alloy steels, stainless steels, and some aluminum alloys. The system performance must be verified for each application by demonstrating that the defects of concern can be detected with the desired reliability.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
E543 Specification for Agencies Performing Nondestructive Testing
E569 Practice for Acoustic Emission Monitoring of Structures During Controlled Stimulation
E650 Guide for Mounting Piezoelectric Acoustic Emission Sensors
E1316 Terminology for Nondestructive Examinations
ASNT Standards
ANSI/ASNTCP-189 Standard for Qualification and Certification of Nondestructive Testing PersonnelAIA Standard
NAS-410 Certification and Qualification of Nondestructive Personnel (Quality Assurance Committee)Keywords
continuous welding; fusion solidification; heat-affected zone; high-temperature sensors; in-process defect location; thermal stress; wave guides;
ICS Code
ICS Number Code 17.140.20 (Noise emitted by machines and equipment); 25.160.10 (Welding processes)
DOI: 10.1520/E0749-96
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