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Method for inspecting an austenitic stainless steel weld

A technology for austenitic stainless steel and inspection coils, applied in instruments, measuring devices, material analysis through electromagnetic means, etc., can solve problems such as delta-ferrite errors

Inactive Publication Date: 2012-05-30
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, sufficient accuracy of inspection cannot always be obtained by utilizing this method, because the delta-ferrite of the excess weld portion (weld reinforcement) of the weld portion is detected as a defect by mistake and for other reasons

Method used

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  • Method for inspecting an austenitic stainless steel weld
  • Method for inspecting an austenitic stainless steel weld
  • Method for inspecting an austenitic stainless steel weld

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Use the probe, eddy current tester and recorder as follows. (1) Probe

[0049] preparation and use image 3 The same probes shown in . The materials and shapes used are shown below.

[0050] Excitation and inspection coil 1 and balance coil 2: outer diameter 28mm x inner diameter 21mm x length 8mm, and copper wire diameter 0.16mm x turns 500

[0051] Permanent magnet 3: Outer diameter 18mm×inner diameter 12mm×thickness 1.8mm×8 pieces

[0052] Neodymium magnet -32H (manufactured by Sumitomo Special Metals. Co., Ltd.)

[0053] Magnetic flux density of the magnetic field formed by this permanent magnet: about 0.5 Tesla

[0054] Spool: polyacetal copolymer (manufactured by Polyplastics Co., Ltd.)

[0055] Magnetic Shield: Carbon Steel

[0056] Shell: polyacetal copolymer

[0057] Adhesive for fixing: Acrylic Adhesive Hard (Made by DENKI KAGAKU KOGYO KABUSHIKI KAISHA)

[0058] (2) Eddy current tester:

[0059] Eddy Current Tester MiniPhasec (manufactured by GE ...

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Abstract

An object of the present invention is to provide a method for inspecting the presence or absence of a foreign metallic material mixed into an austenitic stainless steel material weld with more satisfactory accuracy. The method for inspecting an austenitic stainless steel weld of the present invention is characterized by comprises performing eddy current test of a weld portion of an austenitic stainless steel using a probe comprising an excitation and inspection coil and a permanent magnet disposed inside the excitation and inspection coil, and inspecting the presence or absence of a foreign metallic material mixed into the weld portion, and is also characterized in that magnetic flux density of magnetic field formed by the permanent magnet is from about 0.3 to about 1.5 tesla.

Description

technical field [0001] The present invention relates to a method for inspecting austenitic stainless steel welds. More specifically, the present invention relates to a method of detecting, with more satisfactory accuracy, foreign (different) metallic materials mixed into austenitic stainless steel welds. Background technique [0002] Generally, dissimilar metal materials are not mixed into the weld portion of austenitic stainless steel. However, due to insufficient quality control in the welding process, for example, weld metal formed of carbon steel is sometimes mixed into the weld portion to cause subsequent problems. Carbon steel can be easily detected by magnet test when it is mixed into the outer surface of the weld portion. However, it is difficult to detect carbon steel when it is mixed into the inside of the weld portion such as the first layer of the weld portion. [0003] It is widely performed to check for the presence of defects by conducting an eddy current t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/72G01N27/90
CPCG01N27/9033G01N27/9006
Inventor 多田丰和末次秀彦
Owner SUMITOMO CHEM CO LTD