Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint

A technology of ultrasonic testing and stainless steel, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, and can solve problems such as difficulty in ultrasonic testing of welds

Active Publication Date: 2016-06-29
SHANGHAI SHIPBUILDING TECH RES INST +1
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Problems solved by technology

In addition, the interface of fusion lines or columnar grains can produce irregular reflections and mode conversions, and sometimes cannot even penetrate the weld metal, making ultrasonic inspection of such welds difficult

Method used

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  • Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint
  • Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint
  • Ultrasonic transverse and longitudinal section element-separating detection method for stainless steel and nickel-based steel weld joint

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Embodiment Construction

[0038] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0039] A kind of stainless steel, nickel base steel welding seam ultrasonic vertical and horizontal plane sub-element detection method of the present invention, comprises the following steps:

[0040] Step S1, see figure 1 , in the base metal of stainless steel and nickel-based steel, establish a series of standard reflectors with different depths that do not interfere with each other for ultrasonic testing (long horizontal holes Φ3*40mm are optional), and use this to establish the DAC curve. It should be noted that the double When the crystal angle probe detects standard reflectors, the peak wave drop is not greater than 6dB;

[0041] Step S2, see figure 2 , make the same welding seam comparison test plate as the on-site welding process. Gen...

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Abstract

The invention discloses an ultrasonic transverse and longitudinal section element-separating detection method for a stainless steel and nickel-based steel weld joint. According to the method, a scanning zone is divided into a plurality of same-size cross-sectional area elements along a scanning longitudinal section of a probe according to a matrix, the reason and differentiation degree of ultrasonic beam change during ultrasonic detection of the stainless steel and nickel-based steel weld joint under the same type of welding process conditions are found by conducting relative quantification and orientation and recording and analysis on standard reflector echoes in the different cross-sectional area elements, further more accurate qualitative and quantitative analysis is conducted on flaw wave echoes during the ultrasonic detection, the ultrasonic detection reliability of the weld joint is improved, and the safe usage of the weld joint is guaranteed.

Description

technical field [0001] The invention relates to the technical field of steel weld detection technology, in particular to an ultrasonic vertical and horizontal plane component detection method for stainless steel and nickel-based steel welds used in pressure vessels, pressure pipes and structural parts, which is suitable for agriculture, industry, national defense, and ships. Industries and applications where stainless steel and nickel-based alloy steel welds are used, such as electric power, etc. Background technique [0002] Stainless steel is often divided into martensitic steel, ferritic steel, austenitic steel, austenitic-ferritic (duplex) stainless steel and precipitation hardening stainless steel according to the organizational state. Among them, stainless steel and nickel-based steel are widely used. It is used in materials with high temperature resistance, low temperature resistance and corrosion resistance. The working conditions of these materials are relatively ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
CPCG01N29/07
Inventor 陆雷俊
Owner SHANGHAI SHIPBUILDING TECH RES INST
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