The Research On Method And Process Of Dissimilar Metal Joining Of Luminum To Steel By Pulsed De-gmawelding Brazing

A new bypass fusion pulse arc MIG welding (Pulse Double-Electrode Gas Metal Arc Welding,referred to as Pulse DE-GMAW) method which can low costly, accurately control the heat input ofbrazing aluminum smelting steel was presented in this paper. This paper introduced DE-GMAWmethod to reduce the principle of base metal heat input and analyzed the introduction function ofbypass arc that added additional strength and promoted the droplet transition in small weldingcurrent. Using the pulsed current of Arc and bypass in peak-period promoted the droplettransition.Peak pulse current conducive to achieving a sustainable process in a small welding currenttotal conditions and get a good weld shape, can effectively control the thickness of the formation ofintermetallic compounds interface connector.Aimed at the characteristics and testing requirements of Pulse, DE-GMAW, a rapid prototypingbypass coupling pulse MIG arc welding-brazing test system using real-time environment XPCtarget for the development of rapid software prototyping systems was set up. Welding current signaland visual signals, purchase display, processing and storage, assembled by welding signal analysisand processing were completed on this system. Finally, welding processing was controlled inreal-timing.Analyzing the droplet transition of Pulsed DE-GMAW and welding process stability’s influencewhich affected by pulse welding current parameter etal. When the main and bypass average currentis same, the droplet transition can complete shoot drops by adjusting current pulse parameters.Themain, bypass current and peak pulse duty were increased, the droplet transition was more easily.Through analyzing the experiments dates, it was conformed that the peak current in excess of dropletimpact is more great than the peak pulse duty cycle pulse to pulse base value, the pulse frequency ofdroplet transition form high frequency pulse will produce a decrease of the transition to multi-pulsemode, low frequency pulse will produce a multi-drop mode clock transition.Analyzing the influence of droplet transition and welding stability by the current parameters.Through the process of testing, the square aluminum steel welding parameters were determined.When welding current ranged from82A to54A, aluminum and galvanized steel can be weldedadjusting the size of the main road and bypass current and pulse parameters.weld distance offset therelatively large formation, lap welding process parameters determined by adjusting the processparameters. Tensile strength and weld aluminum alloy1060plate and galvanized steel can reach86.19MPa, reaching72.32percent of the parent material strength. Maximum tensile strength of5356alloy aluminum sheet and galvanized steel welds interface can be achieved186.73MPa, reaching88.5percent of the parent material strength.Finally, the average arc voltage feedback and visual feedback of the main road of two different arc length feedback software and hardware were designed, coupling stability tests arc MIG weldingarc length control on aluminum steel bypass pulse. Two controlling results are satisfactory and meetthe control requirements, although the exact degree of control of arc voltage, arc voltage feedbacksignals from the impact of environmental and droplet transfer. But the hardware requirements arelower structure and relatively simple. Arc voltage feedback control can be applied to Aluminum SteelPulse, DE-GMAW welding process stability control.