An Experimental Investigation on Al-Al Explosive Welding Interfaces
铝-铝爆炸焊接界面的实验研究

A series of Al-Al explosive welding experiments were carried out to investigate the morphology characters of welding interface under the condition of different charge ratios. Metallographic photos of specimen obtained from experiment show that all welding interfaces present macroscopic waveform. But their mesoscopic morphologies are not all continuous waveform, which is not agreed with literature references. Along with the change of charge ratio, microscopic morphologies present sine curve, dots and lines type and all dots type, respectively, the latter two morphologies are discontinuous. Microscopic morphology of welding interface can be explained by theory of detonation wave acting on metal surface. They are determined by the jet thickness and accumulation. The interface continuity is similar to the relationship between continuous water flow and flux. When jet thickness is enough, continuous wave interface is presented, otherwise, interface is discontinuous. Along with the jet thickness becomes thinner and thinner, continuous welding interface transforms into discontinuous one and the discontinuity becomes more severe.