Pulsed laser welding is a joining process, which takes advantage of the laser energy quality with precise control equipment. Its characteristics allow joining thinner materials with reduced thermal distortion without filler material, fulfilling the industrial interest in this process. In the present work, AISI 1005 steel sheets of 1.7 mm thickness were subjected to different pulse Nd:YAG laser treatments to obtain one side bead-on-plate weld samples and double sided butt welds. Since the quality of the joints is strongly influenced by the process parameters, an experimental design methodology was adopted to define a suitable combination of the laser beam power, pulse duration and spot diameter. The Box-Behnken technique and response surface methodology associated with analyses of defects allowed the determination of the appropriate welding parameters. The microstructure characterisation revealed the melted fusion zones originated from the thermal effect of the overlapped pulses. Additionally, microhardness measurements at fusion zone exhibited higher values than the base material and heat affected zone, due to the hard microconstituents developed. The tensile test performed at samples extracted from double sided laser welds showed good resistance results, fracturing at the base material of joints. The present work demonstrates that pulsed laser welding methodology is suitable to obtain high quality joints of steel thin plates.

脉冲激光焊接是一种连接过程，它利用精确的控制设备利用激光能量质量。它的特性允许在不使用填充材料的情况下以较低的热变形连接较薄的材料，从而满足该工艺的工业利益。在本工作中，对厚度为1.7 mm的AISI 1005钢板进行了不同的脉冲Nd：YAG激光处理，以获得一侧的板对侧焊缝样品和双面对接焊缝。由于接头的质量受工艺参数的强烈影响，因此采用了一种实验设计方法来确定激光束功率，脉冲持续时间和光斑直径的适当组合。与缺陷分析相关联的Box-Behnken技术和响应表面方法可确定适当的焊接参数。微观结构表征表明，熔化的熔化区起源于重叠脉冲的热效应。另外，由于形成了坚硬的微成分，因此在熔合区的显微硬度测量值显示出比基础材料和热影响区更高的值。从双面激光焊缝中提取的样品进行的拉伸试验显示出良好的抵抗力结果，在接头的基础材料处破裂。本工作表明，脉冲激光焊接方法适合于获得薄钢板的高质量接头。微观结构表征表明，熔化的熔化区起源于重叠脉冲的热效应。另外，由于形成了坚硬的微成分，因此在熔合区的显微硬度测量值显示出比基础材料和热影响区更高的值。从双面激光焊缝中提取的样品进行的拉伸试验显示出良好的抵抗力结果，在接头的基础材料处破裂。目前的工作表明，脉冲激光焊接方法适合于获得薄钢板的高质量接头。微观结构表征表明，熔化的熔化区起源于重叠脉冲的热效应。另外，由于形成了坚硬的微成分，因此在熔合区的显微硬度测量值显示出比基础材料和热影响区更高的值。从双面激光焊缝中提取的样品进行的拉伸试验显示出良好的抵抗力结果，在接头的基础材料处破裂。目前的工作表明，脉冲激光焊接方法适合于获得薄钢板的高质量接头。从双面激光焊缝中提取的样品进行的拉伸试验显示出良好的抵抗力结果，在接头的基础材料处破裂。目前的工作表明，脉冲激光焊接方法适合于获得薄钢板的高质量接头。从双面激光焊缝中提取的样品进行的拉伸试验显示出良好的抵抗力结果，在接头的基础材料处破裂。目前的工作表明，脉冲激光焊接方法适合于获得薄钢板的高质量接头。