Due to its popularity and high crack sensitivity, 6061 aluminum alloy was selected as a test material for the newly developed double-sided arc welding (DSAW) process. The microstructure, crack sensitivity, and porosity of DSAW weldments were studied systematically. The percentage of fine equiaxed grains in the fully penetrated welds is greatly increased. Residual stresses are reduced. Porosity in the welds is reduced and individual pores are smaller. It was also found that the shape and size of porosity is related to solidification substructure. In particular, a weld metal zone with equiaxed grains tends to form small and dispersed porosity, whereas elongated porosity tends to occur in columnar grains.

利用扩散火焰合成碳纳米管是一项新的技术和方法。介绍了这种新方法的基本原理，较系统地研究了火焰参数、基板材料、合成时间等对碳纳米管形态的影响。初步研究表明它在无外加催化剂的情况下也能合成碳纳米管，具有“自生催化”的特点。

探索了一种新的焊接方法-双而电弧焊在焊接各种材料时的特点。该方法利用两个常规的电弧在工件两侧同时施焊。焊接电流从一个焊炬通过工件流入另一个焊炬。除了具有会聚电弧、提高焊接熔透能力外。该焊接工艺还能够促进焊接凝固时的“柱状品向等轴晶的转变”，改善焊缝组织，减少焊接气孔率这些特点对于提高焊接接头的机械性能具有重要的意义。

采用气氛保护钎焊工艺，对AA4343/AA3003铝合金复合板材料的钎焊接头组织特征，及其与焊接工艺的关系和对接头区显微硬度的影响进行了研究。实验结果表明，钎焊过渡区由单相α（Al）固溶体层和Si扩散层组成，它们的厚度随钎焊条件而发生变化。远离焊接区有一个α（Al）固溶体残余层，它的厚度保持20μm基本不变，与焊接参数和材料性质无关。讨论了钎焊接头特征组织的形成机理。

This study explores an improved method of welding austenitic stainless steel. The method uses two series connected arcs to weld the workpiece simultaneously from opposite sides. Owing to this arc configuration, the welding current is forced to flow from one arc to the other through the workpiece. It is known that such current flow concentrates the arcs and thus improves the penetration capability. Also, the current flowing through the workpiece generates fluid flow within the weld pool. In addition, owing to the use of the two opposite arcs, the heating tends to be symmetric. In addition to the increased penetration, the use of this method for welding austenitic stainless steel results in improved microstructure in the resultant welds because of an increased columnar to equiaxed transition and a decreased angular distortion, which sometimes induces solidification cracking.