作　　者： (梁行）; (姜云禄）; (陈怀宁）; (杜银）;

机构地区： 中国科学院金属研究所,沈阳110016 中国科学技术大学材料科学与工程学院,沈阳110016

出　　处： 《焊接》 2017年第7期23-28,共6页

摘　　要： 采用光纤激光器在3 mm厚不锈钢薄板上进行非熔透型激光焊试验研究。获得了不锈钢光纤激光深熔焊功率密度阈值所在区间,通过测量表征焊缝横截面尺寸的三参数:表面缝宽、中间熔宽和熔深,分析了激光功率P和焊接速度v在不同改变模式下对焊缝横截面尺寸的影响规律。结果表明,焊接速度为5 cm/s时,功率密度阈值位于3.19~3.61 k W/mm^2区间。相同程度地增大P/v,通过增大功率或降低焊速模式,表面缝宽和熔深均会随之变大,但增加功率更为有效,而对中间熔宽的影响略有不同。当保持P/v不变时,同比例增加功率和焊度,表面缝宽基本不变,中间熔宽增大,而熔深先增加后趋于稳定。采用降低焊速方式可更有效地提高搭接接头拉剪强度。 The study on non-penetrating laser welding of 3 mm-thick stainless steel sheets by fiber laser was conducted.The threshold interval of power density of stainless steel in fiber laser welding was obtained.The laser power of P and welding speed of v were changed in different modes,the effects of which on the color of weld backs and the weld sizes were contrasted and analyzed after recording the back colors of weld seam and measuring the weld cross-section sizes,which include surface seam width,middle weld width,and penetration.The results indicate that when the welding speed is 5 cm/s,the laser power density threshold interval for stainless steel fiber laser penetration welding is 3.19 ~3.61 kW/mm^2.Either by increasing the laser power or by reducing the welding speed,to increase P/v at the same proportion,will enlarge the surface seam width and the penetration,but the former is more effective.As for the effects on middle weld width,the two modes are slightly different.And the changes of weld back colors are similar.When P/v remains constant,which means the power and speed are increased at the same proportion,the surface seam width is changed little and the middle weld width is increased.With regard to the penetration,it is increased first and then stays unchanged.In this mode,the colors of weld back are different.The mode of reducing welding speed is more effective in improving tensile-shear strength of overlap joint.

关 键 词： 光纤激光焊 焊接工艺参数 焊缝形状表征参量 功率密度阈值