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Characterization of weld bead geometry in fibre laser butt welding of mild steel sheets by means of statistical modelling

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>2012
<mark>Journal</mark>Lasers in Engineering
Issue number5-6
Number of pages18
Pages (from-to)281-298
Publication StatusPublished
<mark>Original language</mark>English


This paper presents the effect of process parameters on the geometry characteristics in butt welding of 1.5 mm mild steel sheets using a I kW single mode fibre laser at a range of laser powers, welding speeds and laser focal point position. Experiments were planned using the statistical design of experiment (DoE) technique for optimizing the above selected welding parameters and statistical modelling technique was employed to understand their interactions and significance. Suitable parameters to achieve net-shape welds were identified. Experimental methodology and results are detailed and the results are discussed. Micro-hardness measurements and tensile stress testing were carried out. It has been shown that laser net-shape welded samples have superior mechanical properties.