Ultrasonic wave automatic detection system of copper and non-corrodible steel variety metal vacuum brazing water joint

Abstract

The invention discloses an ultrasonic automatic detection system of copper and stainless steel dissimilar metal vacuum brazing water connector, a hardware of which consists of a water connector automatic detection system, a single crystal immersion focusing probe and a reference block; the detection device includes an industrial control machine, a motor driver and motors which are controlled by the industrial control machine and an ultrasonic flaw detection instrument which is respectively connected with the single crystal immersion focusing probe and the industrial control machine; the invention is characterized in that: one motor of the detection device drives a transmission shaft which is moved vertically, a probe angle adjuster is arranged on a shaft, the single crystal immersion focusing probe is arranged at the lower end of a probe angle adjuster, the other motor drives a horizontal rotating disk which is provided with the water connector to be detected, the position of the probe in a water connector cavity body can be regulated by the regulation of the probe angle adjuster, and the ultrasonic waves are transmitted for the detection of the brazing quality of the water connector. The invention has the advantages that the probe structure is compact, the detection system realizes the automatic control, the detection sensitivity is high, the operation is simple, and the invention can automatically identify the defect, calculate the area of defect and provide the spreading picture of the detection results of the water connector rapidly, accurately and intuitively.

Description

technical field [0001] The invention relates to ultrasonic nondestructive testing technology, in particular to an ultrasonic automatic testing system for copper and stainless steel dissimilar metal brazing water joints. Background technique [0002] The copper and stainless steel dissimilar metal vacuum brazed water joint is an important part of the stator coil of the hydroelectric generator of the Three Gorges Power Station, and its quality is of great importance to the safety of the power station. [0003] Copper and stainless steel dissimilar metal vacuum brazing water joints are mainly composed of water joint supports, liners, water boxes and welding filler metals. In order to ensure the welding quality of the product, the welding process test is carried out by vacuum brazing of the pre-set solder ring (sheet), and ultrasonic testing is carried out after welding to make it meet the "Three Gorges Stator Coil Water Joint Acceptance Specification". [0004] The brazing of ...

AI Technical Summary

Problems solved by technology

[0004] The brazing of copper and stainless steel dissimilar metal vacuum brazing water joints belongs to the connection of dissimilar metals. It has a compact structure, irregular dimensions and threaded structure. Welding quality inspection work brings great difficulties

Since the internal space is very narrow and only φ29mm, it must be inspected from the inside of the water joint workpiece, which puts forward special requirements for the size of the probe, chip size and focal length: small diameter, small chip, and small focal length are required, and small equivalent defects can be found , a special probe with high detection sensitivity and high-frequency point focus; and copper has a large attenuation of sound waves, requiring the use of low-frequency probes. How to solve this contradiction puts forward high requirements for ultrasonic testing technology. At present, domestic There is no report on relevant detection technology

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