Research progress on advanced joining technology of high-nitrogen steel

High nitrogen steel offers unique benefits including high strength, toughness, abrasion resistance, and corrosion resistance. The connectors have been widespread application in military equipment, medical instruments, and mining devices. The major domestic and foreign research reports in recent years on gas tungsten arc welding, gas metal arc welding, laser welding and laser-arc hybrid welding, friction stir welding and brazing of high nitrogen steel are summarized in detail.According to the three main classifications of fusion welding, solid-state welding and brazing, the paper systematically reviews the existing various types of high-nitrogen steel welding methods and process control from the aspects of shielding gas, heat input,process parameters and others, introducing the current status of the application of high-nitrogen steel materials in the field of medical devices, oil drilling collars, and armor protection. Finally, the review points out the shortcomings and aspects of the existing research on high nitrogen steel joining systems, expecting to provide information and theoretical basis for the research and application in the fields of high nitrogen steel welding, functional joining of high-strength materials and other related fields.