爆炸焊接波状界面形成和发展的研究

Study on the Formation and Development of Explosive Welding Wave Interface

摘要:

为了研究在爆炸焊接过程中波状界面的形成机理，本文采用对不同强度基板爆炸焊接实验与SPH数值模拟相结合的方式对试样界面形貌及其焊接过程进行了分析。实验发现当焊接参数在可焊窗口以内时，强度较低的材料界面比较容易形成周期性波纹，而且数值模拟结果显示在碰撞点后两个周期的范围内，界面粒子仍然具有较高的运动速度并沿界面持续运动形成界面波；而强度较高且表面光滑的材料则难以形成波状界面。结果表明：爆炸焊接波状界面的形成需要扰动的积累进而触发Bahrani刻入机理，而当界面缺少扰动时则难以形成波状界面；在碰撞点离开后的两个周期范围内，波状界面的熔融金属将沿界面持续运动最终形成稳定的界面波。

关键词:爆炸焊接;成波机理;界面扰动;数值模拟

Abstract:

In order to study the formation mechanism of explosive welding wave interface, the interface morphology and the welding processes were analyzed by means of explosive welding experiment and numerical simulation. The results show that the plates with lower initial strength are more likely to form periodic wave interface when the welding paremeters are within the weldable window, and the molten material within two wavelength after the collision point still with a high velocity and continues the movement along the interface. However, the plates with higher initial strength and smooth surface are difficult to form wave interface. The results indicate that the formation of the wave interface requires the accumulation of disturbance to trigger the Bahrani enching mechanism. In addition, the molten metal within two wavelength after the collision point will continue to move along the interface and eventually form a stable interface wave eventually.

Key words:explosive welding; wave interface formation mechanism; interface disturbance; numerical simulation