2012
DOI: 10.1016/j.optlastec.2012.03.025
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Laser welding of structural steels: Influence of the edge roughness level

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Cited by 33 publications
(15 citation statements)
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“…Kaplan [12] concluded that even a rather low level of roughness (of the order of 5-7 μm) strongly modulates the local absorptivity across the surface of molten metal. Sokolov et al [13] using penetration depth and calorimeter absorbed energy measurements, a correlation between edge surface roughness and absorption in welding structural steel in a buttjoint setup was observed. The absorption of structural steels in butt joint laser welding has a significant dependence on the edge surface roughness at laser powers of ≥ 10 kW, as shown in Fig.…”
Section: Fig 1 Laser Beam Welding Process [4]mentioning
confidence: 97%
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“…Kaplan [12] concluded that even a rather low level of roughness (of the order of 5-7 μm) strongly modulates the local absorptivity across the surface of molten metal. Sokolov et al [13] using penetration depth and calorimeter absorbed energy measurements, a correlation between edge surface roughness and absorption in welding structural steel in a buttjoint setup was observed. The absorption of structural steels in butt joint laser welding has a significant dependence on the edge surface roughness at laser powers of ≥ 10 kW, as shown in Fig.…”
Section: Fig 1 Laser Beam Welding Process [4]mentioning
confidence: 97%
“…However, an increase in the number of processes required for edge surface preparation, like additional machining of the edge surface to create a required roughness level, would certainly decrease the economic benefits of using LBW. One hypothesis suggested by Sokolov et al [13] claims that edge surface roughness has a critical effect on welding efficiency only at the very beginning of the process, when the keyhole is initiated, and that after stabilization of the keyhole it has no effect on the optical or absorption properties of the edge surface. If this is the case, machining need be applied only to part of the edge surface, which would result in considerable cost-savings in meterslong welds.…”
Section: Fig 1 Laser Beam Welding Process [4]mentioning
confidence: 99%
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“…Geralmente, a transição do modo de condução para o de "keyhole" está associada ao aumento da potência do laser ou o tempo de irradiação (SVENUNGSSON; CHOQUET;KAPLAN, 2015).No modo de soldagem a laser "keyhole" o feixe é focalizado para produzir na superfície da peça de trabalho uma densidade de potência incidente suficientemente alta para iniciar a sua vaporização. Esta vaporização evolui gerando uma cavidade estreita e penetrante de vapor ou "keyhole" que é então mantido por múltiplas reflexões internas do feixe (Figura 12)(SOKOLOV et al, 2012). O "keyhole" é cercado por material fundido e ao atravessar a peça, um cordão de solda estreito é formado com uma razão de aspecto elevada (profundidade/largura), ilustrado na Figura 13.…”
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“…O "keyhole" é cercado por material fundido e ao atravessar a peça, um cordão de solda estreito é formado com uma razão de aspecto elevada (profundidade/largura), ilustrado na Figura 13. O "keyhole" é mantido durante a soldagem pelo equilíbrio entre as forças criadas pela pressão de vapor e as exercidas pelo material fundido circundante(SOKOLOV et al, 2012;SOKOLOV;SALMINEN, 2014). Desenho esquemático do princípio da soldagem a laser "keyhole".…”
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