Ultrasonic flaw detection method of austenitic stainless steel sheet weld joint

An austenitic stainless steel and ultrasonic technology, which is applied in the direction of analyzing solids using sound waves/ultrasonic waves/infrasonic waves, can solve the problems of product quality hidden dangers, affect the quality of inspection, and cannot thoroughly detect the internal quality of welds, etc., to increase the signal-to-noise ratio, Quantitative, intuitive and accurate, the effect of the best signal-to-noise ratio

Inactive Publication Date: 2013-05-22
HUDONG HEAVY MACHINERY
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Problems solved by technology

[0004] In summary, when testing the quality of austenitic stainless steel welds, there are many limitations in using the two non-destructive testing methods commonly used at present, penetrant testing and radiographic testing, and the internal quality of the weld cannot be thoroughly tested, and these shortcomings will directly Affect the quality of testing and bring hidden dangers to product quality

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  • Ultrasonic flaw detection method of austenitic stainless steel sheet weld joint
  • Ultrasonic flaw detection method of austenitic stainless steel sheet weld joint
  • Ultrasonic flaw detection method of austenitic stainless steel sheet weld joint

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[0026] The present invention is further described below with reference to the accompanying drawings and examples (ultrasonic flaw detection of stainless steel clad welding seam of GE exhaust cylinder shell, stainless steel sheet thickness is 8mm), but the protection scope of the present invention cannot be limited by this.

[0027] An ultrasonic flaw detection method for austenitic stainless steel sheet weld seam, the method comprises the following steps:

[0028] 1. Ultrasonic flaw detector selection: Ultrasonic flaw detector selects the manual ultrasonic phased array detection system produced in Israel, model: ISONIC-2010. In this embodiment, a linear phased array probe with 2 MHz and 8 elements is used, and the sector angle ranges from 35° to 75°.

[0029] 2. Use the same material to make a comparative test block, and determine the material, shape and size of the comparative test block:

[0030] The same material was used to make a comparative test block. In order to exclu...

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Abstract

The invention discloses an ultrasonic flaw detection method of an austenitic stainless steel sheet weld joint. The ultrasonic flaw detection method comprises the following steps of: 1, selecting a phased array ultrasonic flaw detection device; 2, making a reference block by adopting the same material, and determining a material, a shape and a size of the reference block; 3, detecting and debugging the reference block by using the phased array ultrasonic flaw detection device, and screening artificial flaw detection echoes and noise waves; and 4, carrying out sector-scanning on a workpiece by using the phased array ultrasonic flaw detection device, accurately positioning and quantitatively screening doubtful echoes so as to confirm whether the doubtful echoes are flaw echoes. According to the ultrasonic flaw detection method of the austenitic stainless steel sheet weld joint, various flaws in the stainless steel sheet weld joint can be rapidly and effectively detected.

Description

technical field [0001] The invention relates to defect detection, in particular to an ultrasonic flaw detection method for austenitic stainless steel sheet welds in gas turbine parts. Background technique [0002] In gas turbine components, austenitic stainless steel sheet welding parts are widely used, such as exhaust cylinder lining shells, diffusers, etc. Whether the quality of the welds of such parts meets the design requirements directly affects whether the design function of the gas turbine unit can meet the standard. Therefore, it is very important to accurately detect the weld quality. [0003] The microstructure of the austenitic stainless steel weld is a columnar structure with coarse grains. The ultrasonic wave will reflect, refract and transform at the grain boundary, causing the scattering and attenuation of sound energy, resulting in a low signal-to-noise ratio, and it is difficult to distinguish defect signals. Detection is difficult to implement. At presen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
Inventor 方海李耀宗陈小雷井志哲
Owner HUDONG HEAVY MACHINERY
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