## 1 Introduction  
SiC ceramics are widely used in armor materials of protective equipment such as tanks and armored vehicles because of their high temperature resistance, high hardness, high compressive strength, and strong oxidation resistance [1, 2]. However, SiC ceramics have low ductility and poor toughness, and are easily broken when impacted. Therefore, they cannot be used alone, but need to be welded with metal materials to form composite armor to improve impact toughness and strength [3, 4]. Titanium alloy has the characteristics of high strength, excellent toughness and tensile properties, and good corrosion resistance [5, 6, 7]. Therefore, the composite structure plate composed of the two can avoid the brittleness of SiC ceramics and give full play to the armor protection characteristics of SiC ceramics [8]. At present, vacuum brazing technology is one of the most potential technologies for welding SiC ceramics and metal materials. Vacuum brazing is a welding method in which the brazing filler metal is melted by heating in a vacuum or inert gas environment, so that it penetrates into the surface of the base metal and solidifies, and finally forms a solid connection. Due to the advantages of high quality and strong corrosion resistance, the welded joints prepared by this method have received extensive attention in recent years [9, 10]. [PERSON] et al. [11] inserted a 3D-SiO\({}_{2}\) fiber interlayer between SiC and TC4 alloy (with a nominal composition of Ti-6 Al-4V), and then performed vacuum brazing. The results showed that the welded joints contained abundant and dispersed TiSi\({}_{2}\), TiCu\({}_{2}\), TiSi, and \(\alpha\)-Ti particles, which effectively reduced residual stresses. The shear strength of the welded joints reached 40 MPa. [PERSON] et al. [12] used Cu foam as a liquid solder to join ZrB\({}_{2}\)-SiC ceramics and TC4 alloy by vacuum brazing. They found that the shear strength of the welded joints reached 435 MPa when the holding time was 20 min. However, with an increase in holding time, the content of Ti\({}_{2}\)Cu compounds increased, which was detrimental to the mechanical properties of the welded joints. [PERSON] et al. [13] also used liquid solder AgCuTi-Al to braze C\({}_{\text{f}}\)/SiC composites and TC4 titanium alloy in vacuum brazing. The welded joint contained the intermetallic compound Ti\({}_{3}\)Al, which effectively reduced the residual thermal stress and resulted in a maximum shear strength of 149 MPa. However, vacuum brazing has several disadvantages, including high welding equipment costs, a complex process, and low welding efficiency [14; 15; 16]. In addition, the application of an EU wave in liquid metal can also refine the grains and improve the mechanical properties of the metal, and can effectively solve these problems [17; 18]. At present, the application of electromagnetic field in the field of welding is mainly combined with other welding processes as an auxiliary means. [PERSON] et al. [19] used electromagnetic field-assisted laser welding technology to connect NiTi/316L stainless steel joints. The results showed that compared with the traditional laser welding, the Ti-Fe-based intermetallic compounds in the welding area were suppressed, and the strength and toughness of the welded joints were increased by 28% and 137%, respectively. [PERSON] et al. [20] analyzed the influence of an external transverse electromagnetic field on the flow phenomenon of molten pool by establishing a three-dimensional steady-state laminar numerical model. The results showed that the application of a transverse electromagnetic field during laser welding of aluminum alloy could significantly inhibit the metal flow in the molten pool. In summary, the current application of electromagnetic field in the field of welding was mainly to prepare better welded joints by affecting the arc or molten pool generated by other welding processes in the working process. However, there were few studies on the LF generated by electromagnetic field as the main welding method.