Describe the advantages and current technical level of using additive technologies such as brazing, laser cladding, arc spraying, arc surfacing to replace conventional centrifugal casting to manufacture sliding bearings, and the high-temperature creep-resistant babbitt alloy developed with additive manufacturing technology. Wire composition, the current status of fine wire processing technology with a wire diameter of 1.6 mm, and the prospect of the application of additive manufacturing in the field of sliding bearings and the development trend of Babbitt alloy wire composition optimization and related supporting technologies, whether the superfine SnSb phase will accelerate the wear of the shaft diameter And the question of whether multiple arc surfacing additions will affect the bond strength is discussed. 2. Research on the composition of tin-based babbitt and the current status of wire processing It has a history of more than 100 years, GB/T 8740—2013 'Casting Bearing Alloy Ingots', GB/T1174—1992 'Casting Bearing Alloys' and ASTM B23: 2014 'Standard Specification for White Metal Bearing Alloys'"The general composition requirements given are all based on Sn, Sb, and Cu. With the development of industrialization, bearing materials need to be suitable for high-speed, heavy-duty and high-temperature conditions, and the optimization of the composition of tin-based babbitt has been continuously carried out in recent decades. In the literature [21], a trace amount of Ag was added to the tin-based babbitt alloy (SnSb11Cu6), and the results showed that Ag can improve the high temperature creep resistance of the bearing bush. Reference [22] added 0.6% Zn and 0.1% Ag to SnSb12Cu6, and then the bearing bush was subjected to impact resistance test at 100 °C. The results showed that its impact resistance was more than twice that of Cd-containing alloys. It can improve the strength, but at the same time embrittle the alloy and reduce the impact load; while adding an appropriate amount of Zn and Ag can improve the high temperature strength and achieve the purpose of replacing Cd. Cd has been widely used in the field of soft solder to reduce the melting point, improve wettability, and improve the quality of solder joints. With the process of lead-free, its use is strictly limited due to its strong toxicity. In order to improve the high temperature strength of tin-based babbitt alloys, the literature [23] added trace amounts of Ni, Mn, As, Si, Cd, Fe, Al, V and rare earth, but did not give a detailed description of the addition. The literature [24] studies the addition of improving elements in tin-based babbitt alloys, and the results show that the addition of Ga and P can play an anti-oxidation effect; the addition of In can reduce the melting point and surface tension, and improve the wettability and bonding strength; Improves spreading properties and grain refinement, improves bond strength and wear resistance. Reference [1] introduced the effect of different elements on tin-based babbitt alloys: Ni can reduce the composition segregation, but it will reduce the fluidity of the alloy; Cd can refine the grains and improve the hardness, strength, fatigue resistance and wear resistance of the alloy ;As can refine the alloy grains, reduce the segregation of the alloy, and improve the hardness, strength and wear resistance of the alloy; an appropriate amount of P can increase the fluidity of the alloy during casting; mixed rare earth can improve the plasticity and toughness; Bi, Pb and Fe are harmful element, its content should be controlled. Adding short carbon fibers or carbon nanotubes as tin-based babbitt reinforcement materials in tin-based babbitt can significantly improve the wear resistance, but the addition of these two materials is quite complicated and needs to be added by powder metallurgy after copper plating. 2.2 Manufacturing level of tin-based babbitt wire , that is, alloy preparation → extrusion ingot preparation → excision of extrusion ingot casting cap and skin → extrusion into wire billet → drawing to reduce diameter. The Sb and Cu content of SnSb8Cu4 is not high, and the extruded wire billet is easy to be drawn and reduced in diameter, while SnSb8Cu8 and other tin-based babbitt alloys with a Sb content of more than 10% are difficult to be drawn and reduced in diameter by conventional techniques. With conventional extrusion technology, it is difficult to avoid the grease and air applied on the surface of the extruded ingot from entering the inside of the extruded wire billet, and the phenomenon of oil smoke, explosions and splashes during the drawing process. The wire drawing die cannot draw the wire with the smaller diameter, or the drawn wire has almost zero elongation after breaking, which is easy to break, and cannot continuously and normally carry out the additive surfacing operation. With the promotion of additive manufacturing technology, the demand for tin-based babbitt wire rods continues to increase and the requirements continue to increase. Since 2010, Shaoxing Tianlong Tin Materials Co., Ltd. has been the supplier of Morgan Oil Film Bearings (Shanghai) Co., Ltd. To meet the requirements of localization, we took the lead in developing a high-quality tin-based babbitt wire production process. Reference [27] studied quantitative casting equipment for the production of tin-based babbitt ingots for extrusion, with fewer inherent defects. Reference [28] studies the extrusion die with the functions of exhaust, oil exhaust and automatic extrusion of the skin of the extrusion ingot, which eliminates the defects of grease, air and other inclusions in the extrusion process of the ingot, and meets the requirements of low splash and low oil fume. In order to solve the problem of drawing the wire diameter of tin-based babbitt alloys with high Sb content, the literature [29-30] can draw the wire billet to about φ1.60mm through the roll die, and the drawing process no longer uses lubricating grease, which further reduces the It avoids the generation of oil fume during the use of the wire. At present, the domestically produced tin-based babbitt wire rod can meet the domestic market demand, and the use effect is basically similar to that of similar foreign products. Figure 1 Babbitt wire (from Baidu Encyclopedia) (to be continued, see the website for the first part: Application of Arc Additive Manufacturing Technology in the Field of Sliding Bearings (1)) (Source: Bearing Magazine)