12 Dec,2023
Tip：What are the technical characteristics of low frequency pulsed argon tungsten arc welding?
Low frequency pulsed argon tungsten arc welding has the following process characteristics.
1. During the duration of the pulse current, a point-like molten pool is formed on the weldment; During the period of pulse current shutdown, the base current can only maintain the stable combustion of arc, the heat of the input weldment decreases significantly, and the metal in the molten pool solidify to form the solder joint. The weld therefore consists of a series of solder joints.
2. Stable arc, good stiffness. When the current is small, the general argon tungsten arc welding is easy to float arc, and the arc stiffness of pulsed argon tungsten arc welding is good, good stability, so this welding method is especially suitable for thin plate welding.
3. Low arc energy. The pulsed arc heating of the workpiece is concentrated and the thermal efficiency is high, so the average current required for welding through the same thickness of the workpiece is about 20% lower than that of the general argon tungsten arc welding, thus reducing the line energy, which is conducive to reducing the heat affected zone and reducing the welding deformation.
4. Easy to control weld forming. The solidification speed of the welding pool is fast, and the high temperature residence time is short, so it can ensure a certain depth of penetration, and it is not easy to produce overheating, flowing or burning through, which is conducive to the realization of single-side welding and all-position welding without padding.
5. Good weld quality. Pulsed argon tungsten arc welding joint is formed by overlapping solder joints, and the heat cycle of subsequent solder joints has heat treatment effect on the previous solder joints. At the same time, because the pulse current has a strong stirring effect on the point-like molten pool, the cooling rate of the molten pool is fast, and the residence time at high temperature is short, the weld metal is fine and the dendritic crystal is not obvious. All these make the weld performance improved.
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