Browsing by Author "Lai, Wai Jun"

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Mitigation of start/stop defects in circumferential laser and hybrid laser welding of tubular offshore structures.

Lai, Wai Jun (2021-04)

In recent years, the offshore wind industry's growth and increased demand for larger and stronger offshore wind turbines have led to significant research into the joining and manufacture of thick section tubular structural ...
Study of the effect of inter-pass temperature on weld overlap start-stop defects and mitigation by application of laser defocusing

Lai, Wai Jun; Ganguly, Supriyo; Suder, Wojciech (Springer, 2021-03-08)

Laser keyhole initiation and termination-related defects, such as cracking and keyhole cavities due to keyhole collapse, are a well-known issue in laser keyhole welding of thick section steels. In longitudinal welding, ...
Study on effect of laser keyhole weld termination regimes and material composition on weld overlap start-stop defects

Lai, Wai Jun; Ganguly, Supriyo; Suder, Wojciech (Elsevier, 2020-08-23)

The effects of two different laser termination regimes; laser power ramp-down and laser defocusing, on the weld overlap start-stop region, have been studied on three different compositions of S355J2+N grade steel plates. ...

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