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Standard Practice for Ultrasonic Contact (超声波接触标准的做法)
Designation: E 164 – 97 An American National Standard
Standard Practice for
Ultrasonic Contact Examination of Weldments1
This standard is issued under the fixed designation E 164; 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 () indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope Practice SNT-TC-1A Personnel Qualification and Certifica-
1.1 This practice covers techniques for the ultrasonic A-scan tion in Nondestructive Testing3
examination of specific weld configurations joining wrought
3. Significance and Use
ferrous or aluminum alloy materials to detect weld disconti-
nuities (Note 1). The reflection method using pulsed waves is 3.1 The techniques for ultrasonic examination of welds
specified. Manual techniques are described employing contact described in this practice are intended to provide a means of
of the search unit through a couplant film or water column. weld examination for both internal and surface discontinuities
1.2 This practice utilizes angle beams or straight beams, or
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