The use of sandwich plates has gained significant popularity in the construction and machinery industries due to their exceptional stiffness-to-mass and strength-to-mass ratios. Among various structural types, I-core sandwich plates (T-joints) and corrugated-core sandwich plates (K-joints) are widely utilized. The welding method employed significantly impacts joint performance and overall structural characteristics. This review paper examines recent research on these commonly used sandwich plates and their joint performance, encompassing preparation methods, performance evaluation, structure optimization, and overall research progress. Furthermore, the influence of different preparation methods on the overall performance of sandwich plates is also addressed.