焊接钢管焊缝图像处理方法探讨

根据现行X射线焊缝检测方式下图像产生的机理及图像的特点,从开发实用软件的角度探讨了焊接钢管焊缝检测图像的处理方法,并结合实际开发过程中的经验,给出了焊缝图像计算机处理系统开发的一些建议和具体做法,指出应注意的问题。     

LD2铝合金真空钎焊用铝基钎料的制备及性能研究

利用快速凝固技术制备了8种A1-Si-Cu-Ni四元合金钎料,研究了合金元素对铝基钎料性能的影响。实验结果表明:随着Cu含量的增加,钎料的熔点大大降低,且钎料的铺展面积和抗拉强度都呈现先增加后降低的趋势;随着Si含量的增加,钎料的熔点和抗拉强度皆为先增加后降低,同时钎料的铺展面积明显增加。     

SiCp/Cu复合材料的真空钎焊

对冷压烧结结合热挤压工艺制备的SiC/Cu复合材料,选用Ti和AgCuTi为钎料,采用不同的工艺进行真空钎焊试验.用金相显微镜和扫描电镜对母材和钎焊接头的剪切断口形貌进行分析,利用电子万能试验机对钎焊接头进行抗剪强度测试,将接头抗剪强度与母材抗剪强度进行对比以评判钎缝质量.结果表明,用Ti为钎料连接SiCp/Cu复合材料的连接状况要优于AgCuTi钎料,且连接温度850℃,保温时间为20 min时,抗剪强度最大为70.5 MPa,与母材抗剪强度相当;随着铜基复合材料中SiCp含量不断增加,钎焊接头室温抗剪强度不断下降,当SiCp含量超过10%时,抗剪强度快速下降.     

车顶蒙皮焊接工艺改进

西安某汽车厂客车蒙皮组焊件焊接采用CO2焊,生产效率低,焊接变形大,表面处理难度大,质量难以保证,使产品的质量和产量受到严重的制约,为此必须进行工艺改进.通过采用全自动缝焊焊接工艺及选择合理的工艺参数,在保证结构和强度的前提下,使蒙皮组焊件焊接表面质量大幅度提高,劳动强度大幅度下降,生产效率提高数倍.     

The integrated intelligent system for welding seam error and penetration depth identification

A integrated intelligent system for seam tracking and penetration control is given. The system received information of welding seam error and penetration depth from only one sensor, then, it realized seam tracking and penetration control simultaneously. This paper introduces constitution of the system, methods of information recognition, design of the neuralfuzzy controller and results practically.     

Investigation of wetting behaviour of hardenable copper based-alloys for brazing applications

ABSTRACT

Tools for machining are exposed to high loads, wear, and elevated temperatures. Commonly, such tools consist of cemented carbides and tool steel. To combine the advantages of both materials, high-quality-joints with high strengths are desired. When brazing these materials, the main challenge is the mismatch of the Coefficient of Thermal Expansion (CTE) and the poor wettability of cemented carbides by molten filler alloys. In this regard, the feasibility of two custom-made alloys (CuNi12Si5, CuNi12Si5B0.4) was analysed. Besides being a cost-efficient alternative, these alloys offer the possibility to modify their mechanical properties by precipitation hardening to reduce stresses within the final joints. Thus, this paper shows that a temperature of 1060°C is suitable for wetting and brazing tests on different substrates.     

渗钛Si3N4/Q235钎焊界面反应对接头强度的影响

说明了渗钛Ｓｉ３Ｎ４／Ｑ２３５钎焊界面反应与微观结构对接头强度的关系，并对各主要工艺因素对砂强度的影响规律进行了探讨，为渗钛陶瓷／金属钎焊规范的优化选择提供了试验及理论依据。     

复相Al2O3/SiCw陶瓷与不锈钢钎焊接头的界面反应和反应产物

采用氩气保护下活性金属钎焊法对碳化硅晶须增韧氧化铝陶瓷（Al2O3/SiCw）与不锈钢（1Cr18Ni9Ti)进行了钎焊，所用钎料为Ag-Cu-Ti3活性钎料，通过X－射线衍射仪（XRD）对界面的反应产物进行了物相分析，并用能谱仪（EDAX）分析了界面元素组成，结果表明，钎焊接头界面的反应十分复杂，反应产物多种多样，主要有TiO,Ti2O,TiC,Fe2Ti4O,Ni3Ti,AlTi等物质，界面反应层按Al2O3 SiC/TiO AlTi TiC/TiO2 Fe2Ti4O/Ag-Cu的规律过渡。     

Φ508mm×9.5mm L450MB钢级ERW管线管的试制

焊缝冲击功低且不稳定是ERW管线管生产的一大技术难点。针对高钢级L450MB焊管存在焊缝冲击功不稳定的情况,宝山钢铁股份有限公司宝钢分公司钢管厂采取降低焊接速度、调整热处理工艺的技术方案,试制出焊缝冲击韧性符合标准要求的L450MB钢级ERW管线管。     

Joining alumina to inconel 600 and UMCo-50 superalloys using an Sn10Ag4Ti active filler metal

Alumina ceramics were brazed to Inconel 600 and UMCo-50 superalloys at 900 °C for 10 min using an Sn10Ag4Ti active filler metal. The brazing filler showed good wettability on alumina and superalloys. The flexural strengths were 69 and 57 MPa for alumina/Inconel 600 and alumina/UMCo-50 joints, respectively. In both cases, the brazed specimens fractured along the Sn10Ag4Ti/superalloy interfaces after four-point bending tests. Electron probe microanalysis (EPMA) elemental mapping revealed that the Ni of Inconel 600 and the Co of UMCo-50 dissolved into Sn10Ag4Ti filler metal, which serves to reinforce the weak Sn10Ag4Ti matrix.