Cold metal transition welding method and device thereof

Abstract

The invention aims at providing a cold metal transition welding method and a device thereof. The device consists of an MAG (Metal Active Gas) welding wire automatic feeding unit, a vibration wire feeding unit and an argon arc hot wire welding gun unit; the MAG welding wire automatic feeding unit is connected with the vibration wire feeding unit; the vibration wire feeding unit is connected with the argon arc hot wire welding gun unit through a hose; the argon arc hot wire welding gun unit comprises a straightener, an auxiliary arc welding gun and a main TIG (Tungsten Inert Gas) arc welding gun; and the auxiliary arc welding gun and the main TIG arc welding gun compose a heating source of the argon arc hot wire welding gun unit. The welding method comprises the following steps of: switching on a welding main circuit, and initiating a main TIG arc to heat a welding workpiece; and starting the MAG welding wire automatic feeding unit and a vibrating motor after the arcing of an auxiliary arc is stable. According to the cold metal transition welding method and the device thereof, the welding process is stable, the welding quality is even, the wire-feeding speed and the welding current are independently adjusted, the device is simple, and the cost is low. Based on the ordinary MAG welding wire feeding and arc wire-heating equipment, the vibration wire feeding unit is introduced, thewire heating manner is changed, thus, the cold metal transition welding is realized.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to a cold metal transition welding method and its device. (2) Background technology [0002] High efficiency has always been the key research direction of welding workers, and it is required to improve cladding efficiency under the premise of ensuring welding quality. Among the traditional welding methods, molten arc welding (MIG) and submerged arc welding (SAW) have been widely used due to their high cladding efficiency, but the quality of weld seams has been seriously affected due to defects, large heat input, and serious deformation. not tall. In 2002, Fronius developed the cold metal transition (CMT) welding method on the basis of aluminum and steel welding technology and non-spatter arc starting, which digitally coordinates the wire feeding and droplet transfer process, through the feeding The wire mechanism realizes the welding wire advancement, and the wire drawing mechanism on the...

AI Technical Summary

Problems solved by technology

But this method still has some shortcomings: 1) The welding quality is not as good as that of tungsten argon arc welding (TIG). Restrictions, the arc is extinguished when the forced cold metal transition is used under low temperature conditions, the form of the droplet transfer during the welding process is not stable enough, the weld reinforcement is high, and unfused or slag inclusion defects are prone to occur when multi-layer multi-pass welding is used; 3) full set The transition process adopts digital adjustment and control, and the equipment cost is high, which greatly limits the application in industrial production

However, the arc heating wire increases the temperature of the welding wire, resulting in an increase in the surface tension between the welding wire and the molten droplet, making it difficult for the molten droplet to transition freely, which is manifested as the transition of larger particles.

[0004] Based on the above analysis, traditional CMT welding technology is still limited in terms of improving weld quality and production cost, and there are some practical problems in hot wire TIG welding of low resistivity materials

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