Arc Information Detection And Arc Length Feature Recognition Based On Arc Additive Manufacturing

Arc is used as the heat source of additive-filled metal materials in additive manufacturing.It involves a lot of physical characteristics such as heat,force and sound.These information reflect the dynamic behavior of arc and reflect the macroscopic structure characteristics of metal deposition during arc additive manufacturing.In this paper,an arc information detection and analysis system for TIG arc additive manufacturing was established,and characteristic information such as arc force,arc heat,arc sound wave and arc image was collected in real time.The characteristics of arc heat,mechanics,and acoustic wave signals under different arc parameters were studied.The temperature field and electromagnetic field of the TIG arc were numerically simulated.In addition,based on the arc acoustic signal detection system,the waveform characteristics of the acoustic signal under arc gradient condition are analyzed.Using the high-pass filter and wavelet analysis method,the extremum curve of arc length change is extracted,and the mathematics of acoustic signal and arc length are established.The model,and arc length models with fixed arc length and arc length under different arc current conditions were verified and error analysis was performed to realize arc length prediction during TIG arc additive manufacturing.The results show that the TIG arc pressure is the largest at the central axis of the arc column,and is distributed symmetrically in the radial direction;the heat absorption energy and heat source efficiency of the metal base metal to the arc can be calculated by establishing a calorimeter system;arc current,electric arc current and electric arc length is closely related to the arc pressure and the input heat energy of the arc.The TIG arc was used as an additive to manufacture the heat source,and the metal arc droplet length was deposited in the range of 3 mm to 7 mm in the arc length.It was found that the height and width of the metal deposit changed with the change of the arc length,indicating arc length The influence of the macroscopic morphology of the sediment layer.As the arc length increases,the peak pressure of the electric arc gradually decreases.The absorption energy of the metal to the electric arc heat and the efficiency of the heat source are improved,and the heat source efficiency is the most stable when the arc length is 4 mm.The numerical simulation results of temperature field and electromagnetic field of TIG arc show that with the increase of arc length,the arc decreases gradually along radial temperature,the radius of heat source increases gradually,and the current density and arc voltage distribution reflect their respective energy distribution characteristics.High-pass filtering and wavelet analysis methods are used to establish a mathematical model of acoustic signal length and electric arc length under constant arc length and varying arc length.The arc length model calculation values can be close to the actual measured value,Therefore,it lays a theoretical foundation for predicting and controlling the electric arc length of arc by detecting the acoustic signal in the electric arc additive manufacturing.