What are the process characteristics of low frequency pulsed tungsten electrode TIG welding?
Tig Welding Yolo Materials Industry 4th, Apr 2023 17:00pm
What are the process characteristics of low-frequency pulsed tungsten electrode TIG welding?
1. During the duration of the pulse current, a spot shaped weld pool is formed on the weldment.
During standstill, the base current can only maintain stable combustion of the arc. The heat input to the weldment decreases significantly, and the molten pool metal solidifies to form solder joints.
Therefore, the weld consists of a series of solder joints.
2. Stable arc and good stiffness.
When the current is small, tungsten electrode TIG welding is generally prone to floating arc. However, pulsed tungsten electrode TIG welding has good arc stiffness and stability.
So, this welding method is very suitable for thin plate welding.
3. Low arc energy.
Pulse arc heating of the workpiece is relatively concentrated, with high thermal efficiency. Therefore, compared to conventional tungsten electrode TIG welding, the average current required to weld through a workpiece of the same thickness is about 20% lower.
As a result, the linear energy is reduced, which is beneficial to reducing the heat-affected zone and deformation.
4. Easy to control weld formation.
The welding molten pool has fast solidification speed and short high-temperature residence time. Therefore, it not only ensures a certain penetration depth, but also is not prone to overheating, flowing, or burning through.
It is conducive to achieving single sided welding without backing, double sided forming, and all position welding.
5. Good weld quality.
Finally, pulsed tungsten electrode TIG welds are formed by overlapping solder joints. At the same time, the thermal cycle of subsequent solder joints has a heat treatment effect on the previous solder joint. Then, due to the strong stirring effect of pulsed current on the point shaped molten pool, the cooling speed of the molten pool is fast, and the high temperature residence time is short.
Therefore, the microstructure of the weld metal is fine and dense, and the dendritic crystals are not obvious. These have led to improved weld performance.
What are the process characteristics of high-frequency pulsed tungsten electrode TIG welding?
The frequency range of the current is 10 to 20 kHz.
① Suitable for high-speed welding
High frequency pulsed arc has a large electromagnetic contraction effect and good arc rigidity. During high-speed welding, it is possible to avoid the adhesion of anode spots, as well as the bending or discontinuity of the weld bead. Thereby avoiding defects such as undercuts and poor back surface formation.
Therefore, it is particularly suitable for high-speed automatic welding of thin plates.
② Large melting depth
Due to high arc pressure and high energy density, the penetration ability of the arc is greatly increased.
③High Quality Weld Line
The molten pool is subjected to ultrasonic vibration, which increases its fluidity and improves the physical and metallurgical properties of the weld. It is conducive to the improvement of weld quality.
④ Suitable for large groove welds
During DC tungsten electrode TIG welding, if there are too many filler wires, the fusion between the weld pool and the side of the groove is poor, which causes the weld bead to bulge and deflect to one side.
When welding the next weld bead, it greatly affects the melting of both sides of the weld bead. This can easily lead to poor fusion or incomplete penetration. Hower, high-frequency pulsed tungsten electrode TIG welding can well overcome this defect.
Many characteristics of high-frequency tungsten electrode tig welding are between ordinary tungsten electrode tig welding and plasma arc welding, as shown in the table.
What are the process characteristics of intermediate frequency pulsed tungsten electrode TIG welding?
The frequency range of the current is 10~500Hz, which is characterized by arcing at low currents
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