Research On Weld Identification Method Based On Electric And Magnetic Field Dual Control DC TIG Arc

As an important part of the material joining technology,welding is widely used in the manufacturing industry,but the welding environment is harsh,the welding quality requirements are getting higher and higher,and the degree of automation is still low.With the proposal of "Made in China 2025",the Ministry of Industry and Information Technology clearly pointed out in the relevant notice that it is necessary to speed up the development and application of flexible energy-producing welding equipment for composite energy beam energy fields such as plasma and electric arc,and continuously improve the welding quality and welding automation level in China.It will promote the rapid development of China's welding in the direction of automation,intelligence and digitalization,and the welding quality will be further improved.TIG welding seam metal has high purity,good performance,small deformation of weldment,good arc stability and easy automation,but TIG welding seam has shallow penetration;general arc sensor has improved weld quality,anti-arc interference,and no welding wire The effect of bending caused by arc offset.While the electric field and magnetic field control arc sensing welding seam tracking sensor can meet the characteristics of the general arc sensor,it can achieve the effects of shrinking arc,increasing arc energy,and increasing weld penetration as needed.Therefore,the electric field and magnetic field control arc sensor is Emerging issues to improve welding quality and welding automation and intelligence level.In this paper,the motion mechanism of DC TIG arc plasma in electric and magnetic fields is analyzed and the electric and magnetic fields are added to realize DC TIG arc swing or rotary swing.Secondly,the structure of the electric and magnetic field dual-control DC TIG arc sensor is designed,and the specific parameters of the applied electric field and magnetic field generating device are determined.In addition,the electric and magnetic field dual-control DC TIG arc sensors are designed to simulate the multi-physics fields such as electric field and magnetic field.The structure of the electric and magnetic field dual-control DC TIG arc sensor is optimized,and the fields of the electric and magnetic field generating devices are realized.Expected design requirements.Then,the method of arc-sensing weld identification under electric and magnetic field controlled DC TIG arc oscillation and rotary oscillation is studied.The electric and magnetic field dual-control DC TIG arc oscillation and rotation are obtained by mathematical methods such as coordinate transformation and integral difference.The welding seam identification method under the oscillating,at the same time,the electric and magnetic field dual-control DC TIG arc has the function of adaptive weld deviation compensation.Finally,the arc motion observation and arc voltage signal acquisition platform were built.The high-speed camera was used to record the arc motion patterns in different fields.The characteristics of arc motion patterns under different fields and the corresponding DC TIG arcs under the coupling of electric and magnetic fields were analyzed.Waveform.The results show that the electric and magnetic coupling can control the spin contraction of the DC TIG arc and the regular oscillation,which further verifies the feasibility of the electric and magnetic field dual-controlled DC TIG arc to realize the weld identification.Therefore,it is of practical significance to study the automatic identification of welds by electric and magnetic field dual-control DC TIG arcs to improve the welding automation level and welding quality.