Analysis of the cause of electric shock on the load side of electric welding machine
05 May 2019
Direct cause analysis The kiln system Q235-A is made of steel and has good electrical conductivity. The main responsibility of the accident is that He has no special operation qualification certificate, which is an illegal welding operation. 1. He is ignorant of the most basic skills of electric welding operation. When welding, the left hand holds the hook nail, the right hand holds the welding handle, the welding hook is not in contact with the kiln body, and the load current passes through the lead wire, the welding rod, the welding rod, The hook nail, the human body, the kiln body, and the secondary side ground wire return to the electric welding machine to form a circuit for current circulation, so that the current passes through the human body, causing an electric shock death accident. If the hook of the weld is in direct contact with the kiln body, since the human body resistance is much larger than the resistance of the metal, the current through the human body is small (can be ...
What to do if the product is distorted after ultrasonic welding
27 Apr 2019
There are three reasons for this deformation: 1). The body and the desired fusion or cover cannot match each other due to angle or curvature. 2). The product wall thickness is thin (within 2m/m) and the length exceeds 60m/m. 3). The product is deformed and distorted due to conditions such as injection molding pressure. Therefore, when our products are deformed by ultrasonic operation, it seems to be the cause of ultrasonic welding from the surface. However, this is only a result. Any factors before the plastic products are not welded, what kind of results are formed after welding. If there is no discussion on the main cause, it will take a lot of time to deal with the problem of the right medicine, and in the ultrasonic indirect conduction welding operation (referred to as remote ultrasound), the ultrasonic pressure below 6kg can not change the flexibility and inertia of the plastic. So don't try to use strong pressure to change the deformation before welding (the maximum pressure of t...
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...
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...
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.).
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 ...