A method for ultrasonic testing of austenitic stainless steel fillet welds

A technology for austenitic stainless steel and detection methods, which is applied in the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measuring devices. It can solve problems such as inability to locate and large thickness differences. To achieve the effect of ensuring the quality of the weld seam

Active Publication Date: 2021-06-29
NANJING CHENGUANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large difference in thickness in the direction of transillumination, defect position and direction angle, etc., some defects may not be detected by the radiographic inspection method, and the depth of the defect cannot be located.

Method used

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  • A method for ultrasonic testing of austenitic stainless steel fillet welds
  • A method for ultrasonic testing of austenitic stainless steel fillet welds
  • A method for ultrasonic testing of austenitic stainless steel fillet welds

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Embodiment

[0052] Defects in austenitic fillet welds are mainly pores and slag inclusions in the weld, lack of fusion on the flange side, lack of fusion on the web side and incomplete penetration at the root. Insufficient fusion and incomplete penetration are the main defect types in this type of fillet weld, and they must be detected first. In order to solve this problem, the present invention proposes a method for ultrasonic testing of austenitic stainless steel fillet welds, comprising the following steps:

[0053] Step 1: Select the instrument. A type A pulse reflection ultrasonic flaw detector is adopted, and the working frequency of the flaw detector includes at least 0.5MHz-5MHz.

[0054] Step 2: Select the detection probe. According to different detection locations and objects, three types of probes are required: 1) dual-element longitudinal wave straight probe; 2) dual-element longitudinal wave oblique probe; 3) creeping wave probe.

[0055] 1) Double crystal longitudinal wav...

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Abstract

The invention discloses an ultrasonic testing method for austenitic stainless steel fillet welds. Sensitivity adjustment; workpiece preparation; scanning with probes; defect quantification and evaluation. The invention comprehensively utilizes longitudinal wave twin-crystal oblique probe, longitudinal-wave twin-crystal straight probe and twin-crystal creeping wave probe, and develops corner butt comparison samples, forms a set of special detection methods, and solves the problem of such austenitic stainless steel fillet welds. Ultrasonic testing requirements to ensure the quality of welds.

Description

technical field [0001] The invention relates to weld detection technology, in particular to an ultrasonic detection method for austenitic stainless steel fillet welds. Background technique [0002] Austenitic stainless steel grows up to form columnar grains when heated during the welding process, but there is no phase change during the subsequent cooling and solidification process, so the austenite at room temperature retains the coarse grains of austenite at high temperature. The columnar crystals formed during the welding process have the same orientation in the local area of ​​the weld, but their orientation will vary in different areas of the weld, which leads to the inhomogeneity and anisotropy of the entire weld area. [0003] The columnar grain structure, anisotropy and inhomogeneity of austenitic stainless steel welds bring difficulties to ultrasonic testing. When the direction of the sound beam is not selected properly, the displayed waveform will be disordered, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/24
CPCG01N29/04G01N29/24G01N2291/0289G01N2291/267
Inventor 许有昌孟哲耿永健张振单政马凯平德佳
Owner NANJING CHENGUANG GRP
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