Investigation of the effect of stand-off distance and explosive charge on the interface and mechanical properties of dissimilar joining of phosphorus bronze to St۳۷ steel using explosive welding

In this study, metallurgical investigation of the joint interface resulted from explosive welding of phosphorus bronze to steel was investigated. The effect of explosive welding variables such as explosive charge amount and stand-off distance on interface shape, microstructure and shear strength were investigated. To investigate the effects of these two parameters, plates were welded with stand-off distance of ۲ and ۳ mm and explosive charge thicknesses of ۳۵, ۴۰ and ۴۵ mm. The results showed that with increasing stand-off distance and explosive charge, the velocity and impact angle increased and this phenomenon led to the interface transforming from a smooth to a wavy state, resulting in melted and separated regions. The results obtained from scanning electron microscope (SEM) images showed that with increasing stand-off distance and collision velocity, the length and height of the waves at the interface increased. Energy dispersive X-ray spectroscopy (EDS) analysis showed that no intermetallic compounds were formed at the interface, indicating a good quality bond. The results of the micro hardness test also indicated that the hardness around the joint increased by ۲۵% due to plastic deformation and work hardening caused by impact. The shear strength test revealed that in all samples, failure occurred in the bronze layer and no failure occurred due to separation of the samples from the interface.

کلیدواژه ها:

Explosive welding ، Stand-off Distance ، Explosive charge ، Interface ، Flyer Plate