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The Weldability of Primer-coated Steel for Shipbuilding by CO_2 Laser

机译：Co_2激光造船底漆涂层钢的可焊性

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The application of laser welding technology has been considered to shipbuilding structure. However, when this technology is applied to primer-coated steel, good quality weld beads are not easily obtained. Because the primer-coated layer caused the spatter, humping bead and porosity which are main part of the welding defect attributed to the powerful vaporizing pressure of zinc. So we performed experiment with objectives of understanding spatter and porosity formation mechanism and producing sound weld beads in 6mm~t primer coated steels by a CO_2 CW laser. The effects of welding parameters; defocused distance, welding speed, coated thickness and coated position; were investigated in the bead shape and penetration depth on bead and lap welding. Alternative idea was suggested to suspend the welding defect by giving a reasonable gap clearance for primer coated thickness. The zinc of primer has a boiling point that is lower than melting point of steel. Zinc vapor builds up at the interface between the two sheets and this tends to deteriorate the quality of the weld by ejecting weld material from lap position or leaving porosity. Significant effects of primer coated position were lap side rather than surface. Therefore introducing a small gap clearance in the lap position, the zinc vapor could escape through it and sound weld beads can be acquired. In conclusion, formation and suspension mechanism of the welding defects was suggested by controlling the factors.
机译：激光焊接技术的应用已被认为是造船结构。但是，当该技术应用于底漆涂层钢时，不容易获得良好的质量焊珠。因为引物涂层引起的溅射，驼峰珠和孔隙率，其是焊接缺陷的主要部分，归因于锌的强大汽化压力。因此，我们通过CO_2 CW激光进行了了解飞溅和孔隙形成机制的目标，并在6mm〜T引物涂层钢中产生声音焊缝。焊接参数的影响;离焦距离，焊接速度，涂层厚度和涂层位置;在珠子和钢圈焊接上调查珠子形状和渗透深度。建议通过为引物涂层厚度提供合理的间隙间隙来悬挂焊接缺陷。底漆的锌具有低于钢的熔点的沸点。锌蒸汽在两张板之间的界面处构建，并且通过从膝部位置或离开孔隙率时喷射焊接材料倾向于焊接焊缝的质量。引物涂覆位置的显着效果是圈侧而不是表面。因此，在圈位的位置引入小的间隙间隙，锌蒸汽可以通过它逸出，并且可以获得良好的焊缝珠子。总之，通过控制因素来提出焊接缺陷的形成和悬浮机制。

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