The objective of the research is to investigate and compare the quality of welded samples of two low alloyed steels, S355 and St 3 with various edge preparations in butt joint configuration. Welding was performed with high power fiber lasers with a wavelength of 1070 nm at power levels of 10 and 14 kW. Joint edge surface roughness and the air gap between the plates had a significant effect on penetration depth. Optimum roughness levels and recommended increase in the air gap between the plates to provide maximum penetration depth are presented.
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Sokolov et al. (2012) studied this question.
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