What are the factors related to gas protection during tungsten argon arc welding?

19 Apr 2019

In the case of tungsten argon arc welding, since the argon protective layer is flexible, it is easily damaged by external factors and its protection effect is mainly related to the following factors: (1) Gas flow rate: For a nozzle with a certain aperture, the greater the gas flow rate, the stronger the ability of the protective layer to resist the influence of flowing air. However, when the flow rate is too large, the protective layer will generate irregular flow, which will easily cause the air to get involved, but the protection effect will be reduced, so the gas flow rate should be properly selected. For example, a nozzle having a pore diameter of 5-14 mm has an argon flow rate of 5-15 L/min. (2) Nozzle diameter: When the nozzle diameter and the gas flow rate increase simultaneously, the protection zone must increase. However, when the nozzle diameter is too large, some weld positions are not easy to weld or obstruct the welder's line of sight, thus affecting the welding quality. T...

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The introduction of welding inspection

13 Apr 2019

Many of the properties of welds can be tested by weld inspection, some of which are related to weld size and others to weld defects. Weld size is often extremely important because it is usually directly related to weld strength, and undersized welds may not be able to withstand the stresses at work. Weld seam defects are equally important. Defects inside or adjacent to the weld may result in the weld not achieving its intended performance, depending on the size and/or location of the underfill. Unacceptable weld defects are often referred to as weld defects, which may result in weld failure due to insufficient weld strength or stress concentration. There are many reasons why you need to perform a weld inspection. Perhaps the most fundamental reason is to determine if the weld meets the quality requirements of its intended application. In order to evaluate the weld quality, we must first prepare some form of gauge block and use it to compare various characteristics. The quality of the w...

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Internal component damage after ultrasonic welding

04 Apr 2019

The reason for the internal original damage is that the high-intensity ultrasonic energy is directly or indirectly transmitted to the damaged part. The solution is as follows: 1. Early ultrasonic vibration time (avoid contact and vibration); 2. Reduce the pressure and reduce the ultrasonic welding time (reduce the strength standard); 3. Reduce the number of power stages of the machine or the low-power machine. On the contrary, it is necessary to use high-power ultrasonic welding equipment to complete the welding task in the shortest time with high and light ultrasonic energy. The welding process is not enough to cause damage to the product. ; 4. Reduce the expansion ratio of the ultrasonic mold; 5. The cushion of the bottom mold is cushioned with rubber; 6. The bottom mold and the product avoid floating or gap; 7. HORN (upper mode) re-measures the frequency after avoiding the air; 8. After the upper mold is emptied, stick a flexible material (such as silicon lycium, silica gel, etc.).

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Mask spot welder machine

29 Mar 2019

Ultrasonic non-woven mask spot welding machine principle The non-woven mask spot welder converts 50/60 Hz current into 20 kHz by ultrasonic generator. The transducer is again converted into a mechanical motion of the same frequency and transmitted to the welding head through the amplitude modulator. The welding head transfers the received vibration energy to the joint portion of the nonwoven fabric mask to be welded, and the vibration energy is converted into heat energy by friction to melt the nonwoven fabric. The two-sided non-woven fabric is solidified by molecular chaining, and the perfect combination is achieved, thereby achieving the welding effect. Equipment using this principle includes: mask ear belt spot welding machine, non-woven mask welding machine, non-woven mask point press, non-woven mask sewing machine, ultrasonic mask lace machine, ultrasonic mask spot welding machine, medical mask point Welder, automatic mask ear strap welding machine. Ultrasonic non-woven mask mask ...

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Influence of air pressure on ultrasonic welding

23 Mar 2019

In ultrasonic welding, the pneumatic pressure transmits ultrasonic vibrations to the weldment through the sonotrode. Different materials determine the amount of pressure required during welding. Choosing a suitable pressure value has a very important influence on the welding results. The following small series will let you know the effect of the pressure on the ultrasonic welding. If the air pressure is too low, the ultrasonic vibration will not be transmitted to the weldment well, resulting in insufficient friction between the weldment and the weld surface. A large part of the energy will be worn on the sliding surface, and the final result is Can not form an effective weld. If the air pressure is too high, the vibration energy will be used unreasonably, and the frictional force will be too large, the frictional motion between the weldments will be weakened, and even the amplitude will be affected. The result is the connection between the weldments. The area does not increase but decr...

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Effect of release agent on ultrasonic welding

15 Mar 2019

 Effect of release agent on ultrasonic welding The external release agent (zinc stearate, aluminum stearate, fluorocarbon, silicone) is usually sprayed onto the surface of the cavity to form a separate coating that facilitates removal of the part. The release agent may be transferred to the bonding surface, reducing the coefficient of friction of the material to be welded, affecting the heat generation of the bonding surface, hindering the fusion of the molten surface and forming a suitable connection. Silicone has the most harmful effects. The external release agent can sometimes be removed with a solvent. If an external release agent is necessary, the coatable, printable release agent is not transferred to the molded part, but the resin is prevented from wetting the mold surface. These levels of release agent have the least harmful effect on ultrasonic welding.

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