铝板或其它低强度的金属板的冷焊过程中,其表面杂质经常引起麻烦。金属板表面的氧化层、氮化层、水汽或有机物都会影响金属与金属间的接触,而这种接触却是形成坚固的接合面的必要条件。另外,大多数的表而杂质都非常牢固,不容易从金属表面将其清除掉。处理表面杂质的一般方法是施加足够的压力,使被焊接工件表面产生一个塑性流变层。这个流变层破坏、清除掉氧化层,使干净的金属受到挤压,形成了 In cold welding of aluminum or other low-strength metal sheets, surface impurities often cause troubles. Oxide layers, nitrides, moisture or organic materials on the surface of a metal plate affect the metal-to-metal contact, which is necessary to form a strong bond. In addition, most of the table and the impurities are very strong, it is not easy to remove it from the metal surface. The general method of handling surface contaminants is to apply sufficient pressure to create a layer of plastic rheology on the surface of the workpiece to be welded. The rheological layer destroys, removes the oxide layer, squeezes the clean metal and forms it