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12-12

How to determine the insulation standard of electrical equipment

Through the user's inquiry of electrical switch objects, it is concluded that the most common defects in the application of electromechanical equipment are winding breakdown, winding short circuit, winding open circuit, winding burnt, etc. These are all caused by the difficulty of electromechanical insulation. The life of the motor mainly depends on the insulation quality. The quality of the electromechanical insulation is not only related to the arrangement of the electromechanical insulation, but also related to the electromechanical insulation treatment.
12-12

Survival of the fittest in the welding machine industry is inevitable

Electric welding machine is an indispensable processing equipment for industrial development. It is widely used in various fields of construction, chemical industry, metallurgy, and electric power, with huge market development potential.
12-12

The road to high efficiency and energy saving in electric welding machine industry

With the rapid development of electric power, metallurgy, machinery, electronics and other industries, my country's welding manufacturing industry has also made considerable progress. As an important part of the welding manufacturing industry, the welding machine industry has also been developing rapidly.
12-12

Analysis of Ultrasonic Welding Process of Flat-plate Collector

At present, the heat absorbing film used in the heat absorption film institute in China is aluminum and copper. The selective absorption and recovery film layer processes mainly include: blue titanium film and black chromium plating anodizing. The thickness of the sheet is 0.12mm~0.5mm. For ultrasonic welding, materials of different thickness and hardness require different amplitudes, pressures and lines. This is related to the principle of ultrasonic welding. At the same time, the ultrasonic amplitude must be considered. Transmission attenuation perpendicular to the direction of the welding head. In practical applications, there are several basic directions: 1) the energy per unit area required for welding copper materials is higher than that of aluminum; 2) the depth of the weld pattern and the thickness of the sheet; the thickness of the overall weld pattern width; the thickness of the amplitude pressure material; 3 ) Amplitude pressure material hardness. According to its principle, laser welding generally chooses a thicker sheet, while for ultrasonic welding, there is no need to choose a thick material, just consider the heat transfer efficiency. For example: 0.12mm thick blue titanium diaphragm, usually 0.3mm depth welding head can be selected, and the weld width is 2~2.6mm; when the wear life of the welding head is considered, 0.4mm deep welding head can also be selected , The weld width is 2.8mm. Here is a problem to be noted: the anodized sheet should not have an oxide layer in the part that is in contact with the copper pipe.
12-12

Soldering methods and techniques of printed circuit boards

Welding techniques and techniques for printed circuit board welding. 1 Wetting effect" When hot liquid solder dissolves and penetrates to the surface of the metal to be soldered, it is called metal dipping or metal dipping. The molecules of the mixture of solder and copper form a new alloy partly made of copper and partly soldered. This solvent action is called tin dip, which forms intermolecular bonds between various parts to form a metal alloy eutectic. The formation of good intermolecular bonds is the core of the welding process, which determines the strength and quality of the welding joint. Only the surface of copper is not polluted, and there is no oxide film formed by exposure to the air to be wetted with tin, and the solder and working surface need to reach an appropriate temperature.
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