COLD PRESSURE WELDING - MECHANISMS GOVERNING BONDING
COLD PRESSURE WELDING - MECHANISMS GOVERNING BONDING
复制标题
DOI：
10.1115/1.3439484
复制
发表时间：
1979-01-01
期刊：
影响因子：
--
通讯作者：
BAY, N
中科院分区：
文献类型：
--
作者：
BAY, N
通过断口扫描电镜观察，证实了冷压焊结合形成的机理是：加工硬化层的断裂、表面膨胀增加原始表面面积、原始材料通过原始表面层的裂纹挤出、原始材料之间建立真实的接触和结合。这意味着法向压力以及表面膨胀是控制粘结强度的基本参数。实验研究压力焊接铝铝平面应变压缩下，在一个专门开发的设备，允许独立的变化的正常压力和表面膨胀证实了这一点。基于对表面层裂纹挤压的滑移线分析和原始材料之间真实的接触的建立，提出了粘结强度与表面膨胀和法向压力的函数关系的理论。理论与实验结果符合得很好。
Investigations of the bonding surface in scanning electron microscope after fracture confirm the mechanisms of bond formation in cold pressure welding to be: fracture of work-hardened surface layer, surface expansion increasing the area of virgin surface, extrusion of virgin material through cracks of the original surface layer, and establishment of real contact and bonding between virgin material. This implies that normal pressure as well as surface expansion are basic parameters governing the bond strength. Experimental investigations of pressure welding Al-Al under plane strain compression in a specially developed equipment allowing independent variation of normal pressure and surface expansion confirm this. Based upon a slip-line analysis of the extrusion through cracks of the surface layer and upon the establishment of real contact between virgin material, a theory for the bond strength as a function of surface expansion and normal pressure is developed. The theory is in good agreement with the experimental results.