为了研究焊接参数对激光-电弧复合焊接性能的影响,采用了2 k W光纤激光器和MAG(熔化极活性气体保护焊)复合焊接780 MPa高强钢板,通过高速摄像机观察了熔滴过渡形式及激光(或电弧)先导的等离子体形态,研究了激光(或电弧)先导的特性、激...为了研究焊接参数对激光-电弧复合焊接性能的影响,采用了2 k W光纤激光器和MAG(熔化极活性气体保护焊)复合焊接780 MPa高强钢板,通过高速摄像机观察了熔滴过渡形式及激光(或电弧)先导的等离子体形态,研究了激光(或电弧)先导的特性、激光与电弧间距离、离焦量、MAG电流和熔滴过渡形式对激光-电弧复合焊接性能的影响.结果表明,电弧先导的焊缝成形更好;等离子体不仅影响焊缝形状,而且影响激光-电弧间最佳距离;激光与电弧间距对熔宽的影响较小;焊接电流影响焊缝形状和熔深,随着焊接电流的增加,熔深增加,当离焦量为-2 mm时熔深最大.展开更多
The present study is concerned with laser beam welding and its effect on size and microstructure of fusion zone then, on mechanical and corrosion properties of duplex stainless steel welded joints. In this regard, inf...The present study is concerned with laser beam welding and its effect on size and microstructure of fusion zone then, on mechanical and corrosion properties of duplex stainless steel welded joints. In this regard, influence of different laser welding parameters was clarified. Both bead-on-plate and autogenously butt welded joints were made using carbon dioxide laser with a maximum output of 9 kW in the continuous wave mode. Welded joints were subjected to visual, dye penetrant and radiography tests before sectioning it for different destructive tests. Accelerated corrosion test was carried out based on tafel plot technique. The results achieved in this investigation disclosed that welding parameters play an important role in obtaining satisfactory properties of welded joint. High laser power and/or high welding speed together with adjusting laser focused spot at specimen surface have produced welded joints with a remarkable decrease in fusion zone size and an acceptable weld profile with higher weld depth/width ratio. Besides, acceptable mechanical and corrosion properties were obtained. Using nitrogen as a shielding gas has resulted in improving mechanical and corrosion properties of welded joints in comparison with argon shielding. This is related to maintaining proper ferrite/austenite balance in both weld metal and HAZ in case of nitrogen shielding. As a conclusion, laser power, welding speed, defocusing distance and type of shielding gas combination have to be optimized for obtaining welded joints with acceptable profile as well as mechanical and corrosion properties.展开更多
为了高效去除汽车铝合金轮毂边缘的毛刺,利用2 k W光纤激光加工系统对铝合金轮毂进行去毛刺工艺研究,确定了最佳工艺参数.通过光学显微镜对轮毂横断面的宏观形貌进行表征.结果表明,当激光束从轮毂内侧进行扫描时,轮毂的毛刺完全被去除,...为了高效去除汽车铝合金轮毂边缘的毛刺,利用2 k W光纤激光加工系统对铝合金轮毂进行去毛刺工艺研究,确定了最佳工艺参数.通过光学显微镜对轮毂横断面的宏观形貌进行表征.结果表明,当激光束从轮毂内侧进行扫描时,轮毂的毛刺完全被去除,原有尖边受激光处理后形成了R=0.5 mm的圆角.当激光束由外侧进行扫描且激光的入射角较小时,熔融区域的宽度较小.当离焦量为0 mm时,毛刺的去除效果较好.激光束的扫描速度对毛刺的去除效果影响不大.相比激光的内侧扫描,激光在外侧扫描时熔融区域的宽度较大.展开更多
文摘为了研究焊接参数对激光-电弧复合焊接性能的影响,采用了2 k W光纤激光器和MAG(熔化极活性气体保护焊)复合焊接780 MPa高强钢板,通过高速摄像机观察了熔滴过渡形式及激光(或电弧)先导的等离子体形态,研究了激光(或电弧)先导的特性、激光与电弧间距离、离焦量、MAG电流和熔滴过渡形式对激光-电弧复合焊接性能的影响.结果表明,电弧先导的焊缝成形更好;等离子体不仅影响焊缝形状,而且影响激光-电弧间最佳距离;激光与电弧间距对熔宽的影响较小;焊接电流影响焊缝形状和熔深,随着焊接电流的增加,熔深增加,当离焦量为-2 mm时熔深最大.
文摘The present study is concerned with laser beam welding and its effect on size and microstructure of fusion zone then, on mechanical and corrosion properties of duplex stainless steel welded joints. In this regard, influence of different laser welding parameters was clarified. Both bead-on-plate and autogenously butt welded joints were made using carbon dioxide laser with a maximum output of 9 kW in the continuous wave mode. Welded joints were subjected to visual, dye penetrant and radiography tests before sectioning it for different destructive tests. Accelerated corrosion test was carried out based on tafel plot technique. The results achieved in this investigation disclosed that welding parameters play an important role in obtaining satisfactory properties of welded joint. High laser power and/or high welding speed together with adjusting laser focused spot at specimen surface have produced welded joints with a remarkable decrease in fusion zone size and an acceptable weld profile with higher weld depth/width ratio. Besides, acceptable mechanical and corrosion properties were obtained. Using nitrogen as a shielding gas has resulted in improving mechanical and corrosion properties of welded joints in comparison with argon shielding. This is related to maintaining proper ferrite/austenite balance in both weld metal and HAZ in case of nitrogen shielding. As a conclusion, laser power, welding speed, defocusing distance and type of shielding gas combination have to be optimized for obtaining welded joints with acceptable profile as well as mechanical and corrosion properties.
文摘为了高效去除汽车铝合金轮毂边缘的毛刺,利用2 k W光纤激光加工系统对铝合金轮毂进行去毛刺工艺研究,确定了最佳工艺参数.通过光学显微镜对轮毂横断面的宏观形貌进行表征.结果表明,当激光束从轮毂内侧进行扫描时,轮毂的毛刺完全被去除,原有尖边受激光处理后形成了R=0.5 mm的圆角.当激光束由外侧进行扫描且激光的入射角较小时,熔融区域的宽度较小.当离焦量为0 mm时,毛刺的去除效果较好.激光束的扫描速度对毛刺的去除效果影响不大.相比激光的内侧扫描,激光在外侧扫描时熔融区域的宽度较大.
