On-line monitoring of keyhole instabilities during laser beam welding

Beersiek, J.

doi:10.2351/1.5059233

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…In some cases, external illumination by a diode laser 7 or a second harmonic generator of an Nd : YAG laser 8 is used with a band pass filter to take a clear image of the keyhole and molten pool. The camera based monitoring system is used for seam tracking, 8,9 monitoring of the penetration (full or partial penetration), [10][11][12] welding conditions, 14 weld quality, 7,9,13 weld defects, 1,9 etc. Many research studies have been carried out on the in-process monitoring using a camera based imaging system.…”

Section: Introductionmentioning

confidence: 99%

High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

Tsukamoto¹

2011

Science and Technology of Welding and Joining

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The high speed imaging technique is an attractive tool to elucidate welding phenomena. In this paper, applications of this technique are reviewed in order to understand the power beam welding phenomenon. Monochromatic imaging technique, which can take pictures of plasma with any specific spectrum wavelength, is used to analyse state of the laser induced plasma and distribution of some species, such as ions and atoms of gases and metals. During electron beam welding, intermittent melting process and spiking phenomenon can be clearly recorded by a pinhole X-ray streak camera. The in situ X-ray transmission imaging system is useful to observe the dynamic keyhole and fluid flow behaviour, which cannot be directly observed by any other method. High speed observations of the solidification front clearly show the solidification cracking process. In the present paper, methods to analyse the solidification cracking using high speed imaging are also described.

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Section: Introductionmentioning

confidence: 99%

High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

Tsukamoto¹

2011

Science and Technology of Welding and Joining

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“…Beersiek [18,19] presented a system for process monitoring of laser beam welding based on a CMOS-camera. The system observed the welding process online and coaxial to the laser beam.…”

Section: Other Sensing Techniquesmentioning

confidence: 99%

Review of techniques for on-line monitoring and inspection of laser welding

Shao

Yan

2005

J. Phys.: Conf. Ser.

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Laser welding has been applied to various industries, in particular, automotive, aerospace and microelectronics. However, traditional off-line testing of the welds is costly and inefficient. Therefore, on-line inspection systems with low cost have being developed to increase productivity and maintain high welding quality. This paper presents the applications of acoustic, optical, visual, thermal and ultrasonic techniques and latest development of laser welding monitoring. The advantages and limitations of these techniques are also discussed.

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“…Weld integrity can be correlated with a number of measurable in-process parameters [3], including acoustic emissions, electromagnetic (EM) radiation and weld pool geometry. Acoustic emission signals have been correlated with weld penetration depth and gaps that occur from poor edge alignment in a butt weld.…”

Section: In-process Inspection Systemsmentioning

confidence: 99%

Magnetic flux leakage inspection of tailor-welded blanks

O’Connor¹,

Clapham²,

Wild³

2001

Meas. Sci. Technol.

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A feasibility study was conducted on the application of magnetic flux leakage (MFL) inspection to the evaluation of weld quality in automotive tailor-welded blanks (TWB). Using a permanent magnet configuration, magnetic flux was directed through the weld region of a TWB. A Hall effect sensor was coupled to the movement of a digital plotter and was, thereby, scanned around the weld region. Signals from the Hall effect sensor were processed and correlated with defects to determine corresponding MFL signatures. Simulated through-hole defects as small as 0.34 mm in diameter were readily detected. Furthermore, there was a reasonably linear relationship between the MFL signals associated with these defects and the diameter of the defect hole. Preliminary tests with specimens having naturally occurring defects such as concavity, pinholes, and undercutting, indicate that the MFL technique has excellent potential as an inspection method in this application.

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On-line monitoring of keyhole instabilities during laser beam welding

Cited by 7 publications

References 3 publications

High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

High speed imaging technique Part 2 – High speed imaging of power beam welding phenomena

Review of techniques for on-line monitoring and inspection of laser welding

Magnetic flux leakage inspection of tailor-welded blanks

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