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Ultrathin wall sootblower outer sleeve weld joint ultrasound detection method

A technology of ultrasonic detection and soot blower, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc., so as to ensure the safe production of electric power, improve the detection rate, and achieve the effect of small cracks

Inactive Publication Date: 2008-08-06
天津诚信达金属检测技术有限公司
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AI Technical Summary

Problems solved by technology

Solve the detection of the outer casing of the long-rod sootblower of the power station boiler without affecting the power production

Method used

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  • Ultrathin wall sootblower outer sleeve weld joint ultrasound detection method
  • Ultrathin wall sootblower outer sleeve weld joint ultrasound detection method
  • Ultrathin wall sootblower outer sleeve weld joint ultrasound detection method

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Embodiment Construction

[0032] Ultra-thin-wall sootblower casing weld seam ultrasonic testing method

[0033] 1. Test block, probe and equipment

[0034] 1.1 Design of comparative test block: From the analysis of the above stress and failure reasons, the main purpose of inspection is to check out the cracks that appear during operation. In the process of ultrasonic inspection, a simulated crack test block is needed to quantify defects, but there is no such type of comparison test block for parts with material specifications of φ89×3.5 / 1Cr18Ni9Ti.

[0035] Based on this situation, we use the φ89×3.5 / 1Cr18Ni9Ti pipeline to design the following figure 1 The comparison test block shown. The artificial defect is a rectangular groove with a width of 0.5mm and a depth of 1.0mm, and the surface state of the test block is the same as that of the outer casing of the sootblower. figure 1 : Schematic diagram of comparison test block

[0036] 1.2 Probe design refers to the law of end angle reflection. The 45°...

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Abstract

The invention relates to an ultrasonic method for detecting an ultrathin wall (T less than 4mm) soot blower outer casing welding seam ultrasonic which is not stipulated in the prior ultrasonic testing standards comprises the following steps of adopting a comparison test block and a choice device for probe selection and adjustment, and selecting a K3.5 probe; adopting a Hanwei HS-600a digital ultrasonic defect detector with a crack height measurement function, adjusting scanning rate, preparing DAC curves and determining the sensitivity. The soot blower outer casing welding seam ultrasonic detecting method has the advantages that: the ultrasonic method can detect the ultrathin wall soot blower outer casing welding seam sensitively, correctly, simply and conveniently; the method replaces the ray detection without impacting electricity generation during the detection process; the method can improve the detectable rate, reduce the hidden trouble during the operation of a work piece, ensure an inspection result, find smaller cracks and guarantee safety in electricity generation.

Description

technical field [0001] The invention belongs to an ultrasonic detection method, in particular to an ultrasonic detection method for an ultra-thin wall (T<4mm) sootblower outer casing weld seam. Background technique [0002] The pull rod outer casing of the long rod sootblower of the power plant boiler is composed of the pull rod outer casing and the soot blowing steam source pipe. The soot blowing is carried out once every 120 minutes. The steam source pipe is rotated by the chain drive into the high-temperature furnace, and the soot is blown while rotating. After about 10 minutes of soot blowing, the outer pipe is rotated and pulled out of the furnace, and the operation stops. [0003] Due to the complexity of the working conditions, the weak part of the welding joint is subject to complex alternating stress, vibration fatigue, thermal fatigue, shearing force, etc., which makes the part easily crack and cause fracture. Body and chain transmission, the outer casing is pu...

Claims

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Application Information

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IPC IPC(8): G01N29/11
Inventor 田旭海李永胜
Owner 天津诚信达金属检测技术有限公司
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