ASTM B773-96

Standard Guide for Ultrasonic C-Scan Bond Evaluation of Brazed or Welded Electrical Contact Assemblies

SCOPE
1.1 This guide describes ultrasonic testing procedures that can be used for evaluating the bond quality of electrical contact assemblies manufactured by brazing or welding.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-May-1996
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.11 - Electrical Contact Test Methods

Relations

• Replaced By: ASTM B773-96(2002)e1 - Standard Guide for Ultrasonic C-Scan Bond Evaluation of Brazed or Welded Electrical Contact Assemblies
• Effective Date: 10-May-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: B 773 – 96 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Guide for
Ultrasonic C-Scan Bond Evaluation of Brazed or Welded
1
Electrical Contact Assemblies
This standard is issued under the fixed designation B 773; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This guidance document is the result of an investigation by the ASTM Committee B04.04 Task
Force on Ultrasonic Bond Testing of Electrical Contacts. Although ultrasonic interrogation is widely
employed as a non-destructive evaluation method, its application to the testing of electrical contact
2,3
bonds requires specific techniques. The desire to study the variation of technique and its effect upon
test results was responsible for a round-robin test program. The program was conducted in two phases
in an attempt to standardize practices which would improve testing agreement. This study provided
analysis and suggestions for reducing the variability of test results. The decision of the committee was
to publish a summary of this information to serve as guidelines for writing specifications that will
incorporate practices.
4
1. Scope E 500 Terminology Relating to Ultrasonic Examination
E 1001 Practice for Detection and Evaluation of Disconti-
1.1 This guide describes ultrasonic testing procedures that
nuities by the Immersed Pulse-Echo Ultrasonic Method
can be used for evaluating the bond quality of electrical contact
4
using Longitudinal Waves
assemblies manufactured by brazing or welding.
2.2 American Society for Nondestructive Testing Standard
1.2 The values stated in inch-pound units are to be regarded
(ASNT):
as the standard. The values given in parentheses are for
SNT-TC-1A Recommended Practice for Personnel Qualifi-
information only.
5
cation and Certification in Nondestructive Testing
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Summary of Guide
responsibility of the user of this standard to establish appro-
3.1 Pulse-echo Technique—The pulse-echo technique is
priate safety and health practices and determine the applica-
employed as an ultrasonic testing method which displays
bility of regulatory limitations prior to use.
reflected energy pulses. A Piezoelectric transducer (typically
1.4 It is the responsibility of the user to become familiar
15–25 M Hz frequency with 0.5- to 1.5-in. (12.7- to 38.1-mm)
with all hazards including those identified in the appropriate
focal length in water) converts the original electrical pulse into
Material Safety Data Sheet for this product/material as pro-
a mechanical sound wave and then also acts as a receiver of the
vided by the manufacturer.
reflected mechanical energy, converting it back into useful
2. Referenced Documents
electrical energy. The electrical instrumentation used with the
transducer generates, receives, amplifies, and displays the
2.1 ASTM Standards:
controlled electrical pulses. (See Practices E 214 and E 1001.)
E 214 Practice for Immersed Ultrasonic Examination by the
4
3.2 C-Scan—The amplified electrical signals as received
Reflection Method Using Pulsed Longitudinal Waves
from the transducer are gated for time/distance and establish
the depth of analysis. When the transducer (coupled through a
1
This guide is under the jurisdiction of ASTM Committee B-4 on Materials for
water medium) is made to traverse in the X-Y directions, the
Thermostats, Electrical Heating and Resistance, Contacts and Connectors and is the
gated electrical signals are then used to describe a two-
direct responsibility of Subcommittee B04.02 on Electrical Contact Materials.
dimensional plan view of defects in the interior of the tested
Current edition approved May 10, 1996. Published July 1996. Originally
e1
published as B 773 – 87. Last previous edition B 773 – 87 (1991) . object(s). This plan view of defect information at a given depth
2
Buckley, R. I., Commey, R. R., Jr., and Popat, P. V.,“ Nondestructive Ultra-
of analysis (that is, the brazed or welded layer within the
sonic Inspection of Braze Bonds in High Current Electrical Contact Assemblies,”
contact assembly) is called a C-scan. (See Terminology E 500.)
Proceedings of the Holm Conference on Electrical Contacts, 1971, pp. 63–71.
3
Jost, E., and Fontaine, G., “Ultrasonic In-line Inspection Technique for Contact
Materials,” Proceedings of the Holm Conference on Electrical Contacts, 1979, pp.
5
209–213. Available from A
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