On the mechanism of pore formation during keyhole laser spot welding

• An experimental and theoretical study was carried out to investigate the keyhole collapse and pore formation in keyhole laser spot welding; based on this a process theory was developed. Laser spot welding experiments were carried out mainly in liquid zinc (to simplify the investigation); X-ray imaging was used to observe keyhole behaviour i.e. collapse following switching off of the laser beam. A semi analytical mathematical model was used to simulate keyhole collapse taking into account a number of physical processes. The experimental results and mathematical analysis were used to determine the different process phases occurring during keyhole collapse, also indicating the timescales involved: post-vaporisation, excess keyhole vapour relaxation flow, inertia driven collapse, bubble contraction, recondensation, and rising and resolidification.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

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Produktionsutveckling

Manufacturing Systems Engineering

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