Coating thickness affects surface stress measurement of brush electro-plating nickel coating using Rayleigh wave approach

Progress and Challenges of Ultrasonic Testing for Stress in Remanufacturing Laser Cladding Coating

“…Ultrasonic testing has become a popular direction in the nondestructive evaluation of stress, because it has the advantages of safety, nondestructiveness, and online detection. Remanufacturing laser cladding coating shows typical anisotropic behaviors, while the ultrasonic testing signal in laser cladding coating is influenced by many complex factors [ 16 ]. At present, the nondestructive evaluation of stress in laser cladding coating can only be done roughly.…”

“…The main methods for testing stress based on acoustoelasticity theory include the use of the relationship between ultrasonic velocity and stress [ 44 ]; ultrasonic attenuation degree and stress [ 45 ]; the incident angle of Rayleigh wave and stress [ 46 ]; echo power spectrum and stress [ 47 ]; and the interaction of acoustic beams and stress [ 48 ]. The excitation waveforms used to measure stress in laser cladding coating include Rayleigh waves [ 16 ], critical refraction longitudinal waves [ 49 ], or two wave combinations [ 50 ].…”

“…The key issues in this field have shifted from the study of the apparent problems of quality and performance of remanufacturing products to the deep-seated problems of high quality and reliability assurance. At present, the stress testing methods [ 9 ] can be divided into two categories: destructive methods (the small blind hole method [ 10 ], the stripping layer method [ 11 ], and the ring core method [ 12 ]) and nondestructive methods (the ray diffraction method [ 13 ], the magnetic memory method [ 14 ], the optical method [ 15 ], and the ultrasonic method [ 16 , 17 , 18 ]). Although these methods can determine stress measurements, there are some problems which cannot be ignored; for example, the destructive methods destroy the integrity of the component structure and can only realize the sampling testing, while the X-ray diffraction method is harmful to the health of the operator.…”

Progresses and Challenges of Ultrasonic Testing for Stress in Remanufacturing Laser Cladding Coating

“…The key issues in this field have shifted from the study of the apparent problems of quality and performance of remanufacturing products to the deep-seated problems of high quality and reliability assurance. At present, the stress ·2· testing methods [10] can be divided into two categories: destructive methods [11] (small hole method, stripping layer method, ring core method) and nondestructive methods [12][13][14][15][16] (ray diffraction method, magnetic memory method, optical method and ultrasonic method), Although these methods can realize stress measurement, there are some problems which can't be ignored, for example, the destructive methods destroy the integrity of the component structure and can only realize the sampling testing, The X-ray diffraction method is harmful to the health of operator. The optical method has high requirements for the detection environment and can't be detected on-line.…”

Action mechanism of different fibres on structure and property of plated coatings

“…[1][2][3] During the process of brush plating, the plating pen would apply some pressure to the surface of workpieces, which will create friction force on the surface of workpiece. So if adopted the fibre that possesses the function of water-saving replaces the traditional sheath, then the deformation of fibre will create soft force of a transfer, which will influence the nucleation and crystal growth of coatings during the process of brush plating.…”