Monitoring of high-power fiber laser welding based on principal component analysis of a molten pool configuration

Gao, Xiangdong; Qiao, Wenchao

doi:10.1088/1054-660x/23/12/126001

Cited by 13 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since laser welding has gained growing recognition as a key technology in contemporary welding [1][2][3][4], stability monitoring and defect detection during laser welding have become a focus of research in recent years [5][6][7][8]. At present, optical sensing technology has the widest application in laser welding detection [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The high frequency characteristics of laser reflection and visible light during solid state disk laser welding

2015

View full text Add to dashboard Cite

Optical properties are related to weld quality during laser welding. Visible light radiation generated from optical-induced plasma and laser reflection is considered a key element reflecting weld quality. An in-depth analysis of the high-frequency component of optical signals is conducted. A combination of a photoelectric sensor and an optical filter helped to obtain visible light reflection and laser reflection in the welding process. Two groups of optical signals were sampled at a high sampling rate (250 kHz) using an oscilloscope. Frequencies in the ranges 1-10 kHz and 10-125 kHz were investigated respectively. Experimental results showed that there was an obvious correlation between the high-frequency signal and the laser power, while the high-frequency signal was not sensitive to changes in welding speed. In particular, when the defocus position was changed, only a high frequency of the visible light signal was observed, while the high frequency of the laser reflection signal remained unchanged. The basic correlation between optical features and welding status during the laser welding process is specified, which helps to provide a new research focus for investigating the stability of welding status.

show abstract

Section: Introductionmentioning

confidence: 99%

The high frequency characteristics of laser reflection and visible light during solid state disk laser welding

2015

View full text Add to dashboard Cite

show abstract

“…Several methods have been experimented to detect the weld position. [8][9][10] For instance, seam tracking system LPF, welding monitor, and RoboFind have been commercialized for several years. The most popular technique used for weld joint detection is based on the principle of optical triangulation.…”

Section: Introductionmentioning

confidence: 99%

Measurement of micro weld joint position based on magneto-optical imaging

Gao¹,

Chen²

2015

Chinese Phys. B

View full text Add to dashboard Cite

In a laser butt joint welding process, it is required that the laser beam focus should be controlled to follow the weld joint path accurately. Small focus wandering off the weld joint may result in insufficient penetration or unacceptable welds. Recognition of joint position offset, which describes the deviation between the laser beam focus and the weld joint, is important for adjusting the laser beam focus and obtaining high quality welds. A new method based on the magneto-optical (MO) imaging is applied to measure the micro weld joint whose gap is less than 0.2 mm. The weldments are excited by an external magnetic field, and an MO sensor based on principle of Faraday magneto effect is used to capture the weld joint images. A sequence of MO images which are tested under different magnetic field intensities and different weld joint widths are acquired. By analyzing the MO image characteristics and extracting the weld joint features, the influence of magnetic field intensity and weld joint width on the MO images and detection of weld joint position is observed and summarized.

show abstract

“…For example, Wang et al [11] showed that the periodic oscillation of a plume could be attributed to the oscillation of the keyhole. Gao et al [12] pointed out that the stability of the welding process could be monitored by observing the behavior of the plume. Shcheglov et al [13,14] indicated that the plumes have a remarkable effect on the welding process.…”

Section: Introductionmentioning

confidence: 99%

Plume temperature diagnosis with the continuous spectrum and Wien’s displacement law during high power fiber laser welding

et al. 2014

View full text Add to dashboard Cite

The laser-induced plume is an essential physical phenomenon during high power fiber laser welding. Its physical nature can be investigated by diagnosing its temperature. In order to overcome the lack of sufficient line spectra in the temperature diagnosis, the continuous spectrum method (based on the continuous spectrum and Wien's displacement law) is thus developed in this research. The optical spectra emitted by the plume or plasma were detected by using a SP-2500i spectrometer during bead-on-plate welding with an IPG YLS-6000 fiber laser or fiber laser-arc hybrid. The rationality of the continuous spectrum method was evaluated by comparing the plasma temperatures diagnosed by applying the continuous spectrum and line spectra. The results reveal that the continuous spectrum method used in temperature diagnosis is rational. When the line spectra cannot be detected due to an increase in detected height, the plume temperature can be still obtained by using the continuous spectrum method.

show abstract

Monitoring of high-power fiber laser welding based on principal component analysis of a molten pool configuration

Cited by 13 publications

References 27 publications

The high frequency characteristics of laser reflection and visible light during solid state disk laser welding

The high frequency characteristics of laser reflection and visible light during solid state disk laser welding

Measurement of micro weld joint position based on magneto-optical imaging

Plume temperature diagnosis with the continuous spectrum and Wien’s displacement law during high power fiber laser welding

Contact Info

Product

Resources

About