The incessant push for weight reduction in many industries has resulted in the creation of multi-material structures. Specifically, joining advanced high-strength steels to aluminum alloys is of utmost interest for the automotive industry. However, due to the disparate melting temperatures of the steel and aluminum and concerns about brittle intermetallic compounds (IMCs) formation, traditional fusion welding processes are not suitable for this metal pair. Impact welding, as a solid-state welding method, permits the joining of many dissimilar materials. However, numerical simulation of the impact welding process is extremely challenging due to the excessive element distortion near the contact zone. In this study, a meshless technique, smoothed particle hydrodynamics, was used to simulate the impact between a coated high-strength steel (JAC980) and AA6111-T4 plates. The results then were compared to the experimental tests conducted by vaporizing foil actuator welding method.