GH3128高温合金百科|速度|焊缝|电弧|薄板|钎料

GH3128薄板对接双光束激光-TIG复合焊接净成形工艺研讨杂乱内流道构件为具有杂乱密集内通道的薄壁夹层结构。因为构件蒙皮呈三维结构及薄壁特征,无法实现一体化制造和无缝对接,导致在使用激光对接焊接工艺进行其外蒙皮拼接焊接时,易发生焊缝咬边、背部凸起及背部飞溅等缺点,降低焊缝机械功能,污染并堵塞内部通道。因此,亟需开发一种薄板对接焊接新工艺,在保证焊接质量的基础上,实现焊接净成形,以满足杂乱内流道构件蒙皮拼焊的工艺需求。经过剖析可知,对接空隙的存在以及较小的激光光斑是引起上述缺点的重要原因。鉴于此,本文提出一种GH3128薄板对接双光束激光-TIG复合焊接工艺,并在必定空隙冗余度(空隙不大于板厚的0.2倍)条件下进行实验,系统地研讨了焊接工艺参数(激光功率、电弧电流、焊接速度、热源距离、焦斑距离)对焊缝成形尤其是焊缝背部成形及背部飞溅的影响规律,并对焊缝净成形机理进行了相关研讨和剖析。焊接工艺实验结果表明:焊缝外表熔宽与电弧电流呈正相关,与焊接速度呈负相关,与激光功率、热源距离及焦斑距离关系不大;焊缝背部飞溅、背部凸起及熔宽改变同激光功率呈正相关,与焊接速度及焦斑距离呈负相关;跟着电弧电流的增加,焊缝背部凸起及熔宽改变呈先不变后增加的趋势,背部飞...Research on the Net Forming Process of GH3128 Thin Plate Docking Dual Beam Laser TIG Composite WeldingThe complex internal channel component is a thin-walled sandwich structure with complex and dense internal channels. Due to the three-dimensional structure and thin-walled characteristics of the component skin, integrated manufacturing and seamless docking cannot be achieved. This leads to defects such as weld seam undercutting, back protrusion, and back splashing when using laser docking welding technology for external skin splicing welding, which reduces the mechanical performance of the weld seam, pollutes, and blocks internal channels. Therefore, it is urgent to develop a new technology for thin plate butt welding, which can achieve net welding forming while ensuring welding quality, in order to meet the process requirements of complex internal flow channel component skin welding. Through analysis, it can be concluded that the presence of docking gaps and smaller laser spots are important reasons for the above-mentioned defects. In view of this, this article proposes a GH3128 thin plate docking dual beam laser-TIG composite welding process, and conducts experiments under certain gap redundancy conditions (gap not greater than 0.2 times the plate thickness). The influence of welding process parameters (laser power, arc current, welding speed, heat source spacing, focal spot spacing) on weld formation, especially on weld back formation and back splashing, is systematically studied, and the related research and analysis of weld net formation mechanism are carried out. The welding process test results show that the surface melt width of the weld is positively correlated with the arc current, negatively correlated with the welding speed, and not significantly related to the laser power, heat source spacing, and focal spot spacing; The spatter, protrusion, and changes in melt width on the back of the weld seam are positively correlated with laser power, but negatively correlated with welding speed and focal spot spacing; As the arc current increases, the protrusion and melt width at the back of the weld seam show a trend of first remaining unchanged and then increasing, with back flyingAgCuNiLi钎焊TiC金属陶瓷与GH3128界面结构及接头功能选用AgCuNiLi钎料对TiC金属陶瓷与GH3128镍基高温合金进行钎焊。结果表明:当钎焊温度为840℃,保温10min时,接头典型界面结构能够表示为:TiC金属陶瓷/(Cu,Ni)/Ag(s.s)+Cu(s.s)/(Cu,Ni)/GH3128。跟着钎焊温度的升高或保温时刻的延长,TiC金属陶瓷附近的(Cu,Ni)固溶体层厚度增大,且向钎料内部呈树枝状长大,钎料内部的Ag-Cu共晶组织逐步减少。界面机理剖析表明:钎料中Li的加入能促进界面上(Cu,Ni)固溶体的构成;但(Cu,Ni)固溶体的持续长大则受钎料中Cu元素的分散程度控制。当加热温度由810℃升高到960℃,接头抗剪强度出现先增大,然后缓慢减小的改变趋势。当加热温度为880℃、保温时刻为10min时,接头抗剪强度达到最大值204MPa。Interface Structure and Joint Properties of AgCuNiLi Brazed TiC Cermet and GH3128AgCuNiLi brazing material was used to braze TiC metal ceramics with GH3128 nickel based high-temperature alloy. The results show that when the brazing temperature is 840 ℃ and the insulation time is 10 minutes, the typical interface structure of the joint can be expressed as: TiC cermet/(Cu, Ni)/Ag (s.s)+Cu (s.s)/(Cu, Ni)/GH3128. As the brazing temperature increases or the insulation time prolongs, the thickness of the (Cu, Ni) solid solution layer near the TiC metal ceramic increases, and it grows into a dendritic structure inside the brazing material. The Ag Cu eutectic structure inside the brazing material gradually decreases. Interface mechanism analysis shows that the addition of Li in the brazing material can promote the formation of (Cu, Ni) solid solutions at the interface; However, the continued growth of (Cu, Ni) solid solutions is controlled by the degree of diffusion of Cu elements in the brazing material. When the heating temperature increases from 810 ℃ to 960 ℃, the shear strength of the joint shows a trend of first increasing and then slowly decreasing. When the heating temperature is 880 ℃ and the insulation time is 10 minutes, the maximum shear strength of the joint reaches 204MPa.Ti60钛合金/GH3128高温合金电子束焊接头脆裂原因剖析对Ti60钛合金和GH3128高温合金进行了电子束焊接,对接头显微组织、相成分和显微硬度进行剖析.结果表明,Ti60和GH3128电子束焊接性较差,在焊后发生裂纹.焊缝内生成Ti Ni,Ti2Ni,Ti Cr2和Ti Ni3等脆性化合物,使得接头脆性增大.焊缝区的硬度高于母材,钛侧焊缝区硬度值水平略高于镍侧焊缝区.接头剩余应力数值剖析外表接头存在较大的横向剩余拉应力,应力峰值达到704 MPa,使得钛/镍电子束焊接头在焊后随即开裂.Analysis of the causes of brittle cracking in electron beam welded joints of Ti60 titanium alloy/GH3128 high-temperature alloyElectron beam welding was carried out on Ti60 titanium alloy and GH3128 high-temperature alloy, and the microstructure, phase composition, and microhardness of the joint were analyzed. The results showed that Ti60 and GH3128 electron beam welding had poor weldability and cracks appeared after welding. Brittle compounds such as Ti Ni, Ti2Ni, Ti Cr2, and Ti Ni3 were generated in the weld, which increased the brittleness of the joint. The hardness of the weld zone was higher than that of the base material, and the hardness level of the titanium side weld zone was slightly higher than that of the nickel side weld zone. The numerical analysis of residual stress in the joint showed that there was a large transverse residual tensile stress in the surface joint, with a stress peak of 704 MPa, causing the titanium/nickel electron beam welding joint to crack immediately after welding