â—‹ Three-phase AC induction motor starts running, the motor speed gradually rose from zero until the steady state of this process is called start. According to different start-up methods can be divided into: Direct start Step-down start Frequency start .1, start directly â—‹ switch (or contactor) directly connected to the motor power supply start-up called direct start; â—‹ Direct start of the start-up current, up to 7-15 times the rated current of the motor; â—‹ Advantages: large starting torque; â—‹ Disadvantages: As the starting current is large, will cause grid voltage fluctuations, and start the impact of large, easy to cause deep-well pump mechanical damage. Not suitable for more power (11KW above) the use of submersible pumps. 2, step-down start â—‹ Step-down start-up is the power supply voltage by a device appropriate step-down, and then applied to the motor, and gradually start the process of recovery to rated voltage during start-up. â—‹ buck start mode, due to the start of the lower start-up voltage, making the start-up current is reduced, usually, buck start-up impact current is 4-7 times the rated current of the motor. â—‹ Advantages: starting current is reduced, to complete the high-power motor start. â—‹ Disadvantages: low starting torque, large mechanical impact, demanding on the grid overload capacity. 3, frequency start â—‹ Frequency starting is the most advanced AC motor starting method, the principle is that the inverter will be continuously adjustable voltage and frequency applied to the motor to complete the smooth start of the motor. â—‹ Inverter start-up current can be controlled within the rated current of the motor. â—‹ Advantages: Start current is small, starting torque, no mechanical impact, will not cause impact on the power grid. â—‹ Disadvantages: easy to produce harmonics, thus undermining the motor insulation, damage to the motor bearings. By installing output reactor, the basic problem can be solved Tungsten carbide mixed Metal Alloy Powder is commonly used in PTA (Plasma Transferred Arc) welding. PTA welding is a process that involves the deposition of a hardfacing material onto a base metal to provide wear resistance, corrosion resistance, and improved mechanical properties. Mixed Powder,Arc Welding Powder,Pta Welding Powder,Plasma Welding Powder Luoyang Golden Egret Geotools Co., Ltd , https://www.lygoldentool.com
Tungsten carbide is a very hard and wear-resistant material, making it ideal for applications where high abrasion resistance is required. It is often mixed with other metals, such as nickel, cobalt, or chromium, to form a metal alloy powder. These metal alloys enhance the properties of the tungsten carbide and improve its compatibility with the base metal.
The tungsten carbide mix metal alloy powder is typically fed into the PTA welding torch, where it is melted and propelled onto the surface of the base metal using a high-energy plasma arc. The molten powder forms a hard, dense coating that bonds with the base metal, providing excellent wear resistance and protection.
The specific composition of the tungsten carbide mix metal alloy powder can vary depending on the application requirements. Different ratios of tungsten carbide and other metals can be used to achieve desired properties, such as hardness, toughness, and corrosion resistance.
Overall, tungsten carbide mix metal alloy powder is a versatile and effective material for PTA welding, offering superior wear resistance and protection for various industrial applications.