Ultrasonic nondestructive testing system for large blacksmith welding pieces

Abstract

The invention relates to an ultrasonic nondestructive testing system for large blacksmith welding pieces, which comprises a computer with a human-computer interface, an FPGA (Field Programmable Gate Array), a network communication controller, an electric scanning device and a manual control panel, wherein the FPGA comprises a logic control unit (LCU), a pulse generator of a moving shaft, a control register, a status register, a parameter register and a decoding circuit, the electric scanning device comprises two ultrasonic angle probes transmitting and receiving ultrasonic signals on the same plane, an alternating servo motor driver and a driving motor, and the manual control panel comprises a manual selective switch, an inching button, a scram button and a limit switch. The position and the size of a defect in a weld joint is determined after SAFT (Synthetic Aperture Focusing Technique) treatment is carried out on ultrasonic signals of the two ultrasonic angle probes of the system, the testing precision and the reliability are obviously improved, the maximum thickness of the tested weld joint is 600mm, and the testing system can meet the ultrasonic nondestructive testing requirement of a super-large blacksmith welding piece with the thickness of 400 mm-600 mm.

Description

technical field [0001] The invention relates to non-destructive testing, in particular to an ultrasonic non-destructive testing system for large forged and welded parts. Background technique [0002] In the ultrasonic testing process of the ultra-large thickness forging weldment with a weld thickness of 400mm~600mm, the echo signal noise is large and the defect signal is weak due to the microstructure and long sound path diffusion, so the flaw detection sensitivity is low and the defect detection Defects with large dimensional errors. Although ultrasonic testing has high sensitivity and strong penetrating ability, it still has the disadvantages of low signal-to-noise ratio and low measurement accuracy when used for super-thickness weld detection, and the data collected by conventional manual ultrasonic testing cannot be stored and reproduced. The current People's Republic of China Machinery Industry Standard JB / T 4730-05 stipulates on ultrasonic testing: the applicable rang...

AI Technical Summary

Problems solved by technology

There is no angle probe synthetic aperture focusing technique (Synthetic Aperture Focusing Technique, abbreviated as SAFT) inspection system and method with a weld seam larger than 400mm

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