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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 1070nm at power levels of 10 and 14kW. Joint edge surface roughness and the air gap between the plates had a significant effect on penetration...
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