In situ measurement of ultrasonic behavior during lap spot welding with laser ultrasonic method

Nomura, Kazufumi; Deno, Soshi; Matsuida, Taketo; Otaki, Satoshi; Asai, Satoru

doi:10.1016/j.ndteint.2022.102662

Cited by 10 publications

(2 citation statements)

References 37 publications

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“…There are over 5,000 weld joints connecting thin plates of various widths in a steel automobile body [5,6] , and the quality of these spot weld joints has a major impact on the safety and reliability of the vehicle. The RSW process has the advantages of a high degree of automation, small welding deformation and stress, simple operation, and high efficiency [7,8] . This paper takes CP980 complex-phase steel as the research object, through the orthogonal experimental design of RSW process parameters, and takes the joint tensile shear load as the evaluation index, to study the effect of different process parameters on the performance of spot-welded joints.…”

Section: Introductionmentioning

confidence: 99%

Optimized designing of process parameters for CP980 steel resistance spot welding based on Orthogonal Test

Tian,

Feng,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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Based on the orthogonal experimental design method, taking CP980 steel as the research object and the tensile sheer force of spot-welded joints as the evaluation index, the effect of different process parameters on the welding performance of resistance spot welding was studied with the extreme variance method. The results indicated that welding current had a significant effect on the shear force, followed by electrode pressure, while welding time had the least effect; the optimal welding parameter of the CP980 spot welded joint was that the welding time was 400 ms, the welding current was 9.5 kA, and the electrode pressure was 3.6 kN. The formation of lath martensite during solidification led to a higher hardness in the nugget region, reaching a maximum of 434 HV. The subcritical heat-affected zone formed a softened zone with an average hardness value of 299 HV as a result of welding thermal cycling.

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Section: Introductionmentioning

confidence: 99%

Optimized designing of process parameters for CP980 steel resistance spot welding based on Orthogonal Test

Tian,

Feng,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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show abstract

“…With the development of laser technology, laser ultrasonic testing has become an important nondestructive testing technology [5][6][7][8]. This technology has a bright future because of its non-contact [9], wideband [10], instantaneous [11,12], and high-sensitivity characteristics [13]. It is not only suitable for remote detection in severe environments [14,15] but also for real-time online analysis of micro-cracks [16,17].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of angled surface crack detection based on laser ultrasound

et al. 2022

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As an important branch of non-destructive testing, laser ultrasonic testing has attracted increasing attention in the field of material testing because of its instantaneity, non-contact and wide adaptability. Based on the finite element method, the process of laser-excited ultrasonic signal is numerically simulated, and the influence of angled cracks on the ultrasonic signal is analyzed. In this paper, the effects of the time function, pulse width, and spot radius of a Gaussian light source are analyzed through the transient field. The different modes of the ultrasonic signal are used to fit the crack’s angle, depth, and width to complete the characteristic analysis of the surface angled crack. The results show that the displacement peak-valley difference of the direct Rayleigh wave is negatively correlated with the crack angle. The displacement extremes of the transmitted Rayleigh wave boundary are negatively correlated with crack depth and width, while the transmitted Rayleigh wave is positively correlated. This paper presents a method for the quantitative analysis of surface-angled cracks and provides a theoretical basis for further experimental verification.

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Simulation of Photoacoustic Wave Generation and Propagation in Fluid-Solid Coupled Media Using Finite Integration Technique

Nakahata,

Miki,

Maruyama

2024

Structural Integrity

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In situ measurement of ultrasonic behavior during lap spot welding with laser ultrasonic method

Cited by 10 publications

References 37 publications

Optimized designing of process parameters for CP980 steel resistance spot welding based on Orthogonal Test

Optimized designing of process parameters for CP980 steel resistance spot welding based on Orthogonal Test

Numerical simulation of angled surface crack detection based on laser ultrasound

Simulation of Photoacoustic Wave Generation and Propagation in Fluid-Solid Coupled Media Using Finite Integration Technique

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