陶瓷角衬垫在熔透T形接头中的应用

介绍了一种陶瓷角衬垫的功用和结构特点,分析了其焊接工艺特点,并结合建筑、桥梁钢结构中的一些熔透T形接头,阐述了其应用效能。

Electron beam welding of precipitation hardened CuCrZr alloy:Modeling and experimentation

In order to maintain the structural consistency during the welding of precipitation hardened copperchromium-zirconium(PH-CuCrZr)alloy components,electron beam welding(EBW)process was employed.Experimental study and numerical modeling of EBW process during welding of PH-CuCrZr alloy components were carried out.A 3D finite element model was developed to predict the output responses(bead penetration and bead width)as a function of EBW input parameters(beam current,acceleration voltage and weld speed).A combined circular and conical source with Gaussian heat distribution was used to model the deep penetration characteristic of the EBW process.Numerical modeling was carried out by developing user defined function in Ansys software.Numerical predictions were compared with the experimental results which had a good agreement with each other.The developed model can be used for parametric study in wide range of problems involving complex geometries which are to be welded using EBW process.The present work illustrates that the input current with a contribution of 44.56%and 81.13%is the most significant input parameter for the bead penetration and bead width,respectively.

船用管双道激光-MAG复合焊打底焊工艺研究

针对船用管全熔透焊接要求及焊接现场工况条件,提出了一种船用管双道激光-MAG复合打底焊新工艺方案。首先采用MAG焊填充坡口组对间隙,然后通过激光-MAG复合焊焊接,利用激光束的小孔效应,形成全熔透焊缝。针对该技术方案开展大量工艺试验研究,结果表明,该方案工况适应能力强,最大3 mm间隙和2 mm错边情况下可稳定焊接;焊缝正面成形良好,背面熔透均匀一致;焊接接头主要力学性能指标合格,满足实际生产要求。