How is the maximum value of the rated input current of the welding machine obtained?

Calculation of power and current of single-phase welder.

BX1, BX3, BX6 AC arc welding machine.

The output voltage (u0) multiplied by the output current (i0) multiplied by the coefficient ( ) equals the input dynamopower divided by the input voltage (u1) equals the input current (i1).

For example, BX1-500: output voltage.

76V ) multiplied by the output current (500A) multiplied by the coefficient ( ) equals the input dynamopower ( 40150W ) divided by the input voltage ( 380V ) equals the input current ( ).

Estimation of current of electrical equipment: When the power of the electrical equipment is known, its rated current can be estimated:

The rated current of the three-phase motor is calculated according to 2 times the power of the motor, that is, every kilowatt multiplied by 2 is the amount of current of the rated current, for example, the rated power of a three-phase motor is 10 kilowatts, the rated current is 20 amps. This estimation method is the closest to the three-phase squirrel cage asynchronous motor, especially the fourth stage, and can also be used for other types of motors.

The current per kilowatt of single-phase 220V motor is calculated as 8A.

The current per kilowatt of three-phase 380V electric welding machine should be calculated (DC electric welding machine with motor should be calculated as 2A per kilowatt.)

Single-phase 220V welding machine per kilowatt is calculated.

Single-phase incandescent lamps and iodine-tungsten lamps are calculated per kilowatt of current.

Note: The commonly used dysprosium lamp on the construction site is a 380V power supply (only two phase wires and one ground wire), and the current is calculated per kilowatt.

A: It is actually measured at the rated input voltage! We specialize in the production of electric welding machines!

The simple calculation method is very accurate.

Single-phase welder power calculation.

BX1, BX3, BX6 AC arc welding machine.

The output voltage (u0) multiplied by the output current (i0) multiplied by the coefficient ( ) equals the input dynamopower divided by the input voltage (u1) equals the input current (i1).

For example, BX1-500: Output voltage (76V) multiplied by Output Current (500A) multiplied by coefficient ( ) equals input dynamom power (40150W) divided by Input Voltage (380V) equals input current ( ).

The output voltage of the welding machine is divided into no-load and working voltage, and the no-load voltage is about 50V and 70V. The working voltage is about 30V. The secondary current is commonly used 40A-600A (adjustable) according to the needs of the work, and there is a special welding machine with a larger current.

Welding machines are available in both AC and DC.

The welding machine is a transformer, the product of the primary voltage and current is equal to the product of the secondary voltage and the current, the welding machine is a step-down transformer, in order to melt the welding rod, it is necessary to use a large current, the current increases, the voltage decreases. It will not hurt people is the reason for the low voltage, the resistance of the human body is certain, the voltage is low, and the current passing through the human body is small, so it will not hurt people.

The purchase of electric welding machine:

1. When purchasing welding machine products, it is necessary to go to regular production enterprises or large shopping malls to buy, and to buy brand famous products with high market share. Don't go to a small store to buy it cheaply, where the quality of the welding machine cannot be guaranteed.

2. When purchasing, check whether the nameplate on the product has the name of the manufacturer, production address, specification and model, welding current adjustment range, load duration rate and input voltage and current, etc., and then determine the welding machine you want to buy according to the needs of the work.

3. When purchasing, you can ask the dealer to provide a product quality inspection report or certificate. Because the welding machine product is a national compulsory certification product, it is necessary to confirm whether the product has passed the "3C" certification when purchasing. You can also check online.

4. When purchasing, be sure to check whether the product has grounding screws, and the grounding screw connection should be paintless and well grounded. Whether the movement is clean and whether the insulation is damaged or not to ensure the safety of use, if necessary, can also be checked.

5. Before purchasing, you can power on to check the operation, conversion and installation of the switch on the panel, the power indicator light is on and off, whether the fan is normal, whether the power supply part has abnormal vibration and buzzer, whether there is peculiar smell, whether there is discoloration and other heating phenomena on the appearance, so as to ensure the quality of the welding machine and give full play to the performance of the welding machine.

6. If you want to buy a gas shielded welding machine, you should also check whether the accessories are complete, whether the wire feeder has oil stains, whether the rotation is stable, whether the connecting cable matches the surface insulation and whether there is damage, so as to ensure the stability of the arc.

Small electric welding machine, 24 volts, maximum current 180 amps, medium: 50 volt current adjustable 0 400 amps, large: 75 volts, current up to 800 amps, because there are many models of welding machines, the above current is only one of them, but the output voltage seems to be these three.

Generally, the AC welding machine voltage is AC 40-55V, the current is related to the power of each welding machine, and the voltage with high power should also be higher.

Generally, the output voltage of the welding machine is about 70 volts, and the minimum current is 150 to 500 amperes, which is determined by the power of the welding machine.

Single-phase welding machine power and current calculation BX1, BX3, BX6 AC arc welding machine output voltage (u0) multiplied by output current (i0) multiplied by coefficient ( ) is equal to input dynamopower divided by input voltage (u1) is equal to input current (i1). For example, BX1-500: Output voltage (76V) multiplied by Output Current (500A) multiplied by coefficient ( ) equals input dynamom power (40150W) divided by Input Voltage (380V) equals input current ( ).

Estimation of current of electrical equipment: When the power of the electrical equipment is known, its rated current can be estimated: the rated current of the three-phase motor is calculated according to 2 times the power of the motor, that is, the amount of current per kilowatt multiplied by 2 is the rated current.

The welding machine needs a large current to melt the welding rod and weldment to achieve the purpose of welding, so the current must be large. It shows that the welder can grasp the current and facilitate welding. I don't know if you've seen the inner core and winding group of the welding machine.

An electric local welding machine is essentially a transformer. The current required for electric welding is large, and it can melt steel in an instant to achieve the purpose of welding, so the silicon steel sheet in the electric welding machine has a large specification, and the corresponding coil winding wire diameter should be thick. Moreover, the coil winding wire of the welding machine is not an ordinary round wire, but a flat strip wire, which is to make the good one match with the silicon steel sheet and produce a large enough current.

This needs to be calculated based on the voltage you input and the current you output.

The primary voltage multiplied by the current is equal to the secondary voltage multiplied by the current. If you now know the secondary voltage and current and also know the primary voltage, then you don't know the input current?

You can see what the input current is from the welding machine, generally there will be a target on the welding machine, 16A depends on whether your welding machine is 220V or 380V.

The simple calculation method is very accurate.

Single-phase welder power calculation.

BX1, BX3, BX6 AC arc welding machine.

The output voltage (u0) multiplied by the output current (i0) multiplied by the coefficient ( ) equals the input dynamopower divided by the input voltage (u1) equals the input current (i1).

For example, BX1-500: output voltage.

76V ) multiplied by the output current (500A) multiplied by the coefficient ( ) equals the input dynamopower ( 40150W ) divided by the input voltage ( 380V ) equals the input current ( ).

Regular welding machines have current regulators, about 50 to 600A The output voltage is divided into no-load and working voltage, no-load voltage refers to the voltage of the welding machine when it is not working, about 50V between 70V, the voltage is high and it is easy to ignite the arc The working voltage is the voltage that guides the normal welding after the arc, and this voltage is about 30V The size of the current is related to the workpiece that needs to be welded, the thickness of the workpiece is large, and the current required is also large, and vice versa, the smaller the current is at the same time, the current is large and easy to ignite the arc. If the thickness of the workpiece is small and the current of the regulation is large, the workpiece is easy to weld through.

Regular welding machines have current regulators, about 50 to 600A The output voltage is divided into no-load and working voltage, no-load voltage refers to the voltage of the welding machine when it is not working, about 50V between 70V, the voltage is high and it is easy to ignite the arc The working voltage is the voltage that guides the normal welding after the arc, and this voltage is about 30V The size of the current is related to the workpiece that needs to be welded, the thickness of the workpiece is large, and the current required is also large, and vice versa, the smaller the current is at the same time, the current is large and easy to ignite the arc. If the thickness of the workpiece is small and the current of the regulation is large, the workpiece is easy to weld through.

The output voltage is 55VThe current is 200, 315, 600A.

Now the secondary voltage of the electric welding machine has dropped to 36 volts. It used to be 72 volts. The current is a short-circuit current, you do the math.

The input current of the welding machine is not constant, although it varies according to the magnitude of the secondary welding current. 14kVA refers to the maximum load that can be output by the welding machine. The secondary voltage of the welding machine is about 25-30V, which is calculated as 27V

Then the maximum output welding current is 14kVA 27V=518A; At this time, the input current is 14kva 380V=36If the welding current is 100A, the output load is 100A*27V=; At this time, when the current is entered. This is an approximate calculation, as both the welding current and the welding voltage are unstable.

1.Single-phase welding machine in=s un;

2.Single-phase 380 welding machine in=s un;

3.Three-box welding machine in=s (;

Where: in--rated current (a); s--Rated Capacity(kVA);

un--Rated voltage (kv.)

The welding current is uncertain, and the efficiency factor is unknown.

Isn't it over if you take the pliers and get stuck directly?

Your question makes me unable to do so, can you be more detailed?

Electric welding machine (electric welding machine) is actually a transformer with descending external characteristics, the 220V and 380V alternating current into low-voltage direct current, the welding machine can generally be divided into two types according to the output power supply type, one is AC power supply; One is direct current. DC welding machine can be said to be a high-power rectifier, divided into positive and negative poles, AC input, after transformer transformer, and then rectified by the rectifier, and then output a power supply with descending characteristics, the output will produce a huge voltage change when it is turned on and off, the two poles ignite the arc when the instantaneous short circuit, and use the generated arc to melt the welding electrode and welding consumables, and then cool to achieve the purpose of combining them. The welding transformer has its own characteristics, and the external characteristics are the characteristics of the voltage dropping sharply after the electrode is ignited.

Due to the flexibility, simplicity, convenience, firmness and reliability, the advantages of welding and even the same strength as the base metal are widely used in various industrial fields, such as aerospace, ships, automobiles, containers, etc.! [This paragraph] the characteristics of the welding machine First, the advantages of the electric welding machine: the electric welding machine uses electric energy, the electric energy is instantly converted into thermal energy, electricity is very common, the electric welding machine is suitable for working in a dry environment, does not need too many requirements, because of the small size, simple operation, easy to use, fast speed, weld after welding and other advantages are widely used in various fields, especially for the parts that require high strength, it is particularly practical, and the same metal material can be connected permanently in an instant (can also be connected with different metals, but the welding method is different), After heat treatment, the weld has the same strength as the base metal and seals well, which solves the problem of sealing and strength for the manufacture of storage gas and liquid containers.

Second, the disadvantages of the welding machine: the welding machine will produce a certain magnetic field around the welding machine in the process of use, and the arc will produce radiation to the surroundings when burning, and there are infrared, ultraviolet and other light types in the arc light, as well as harmful substances such as metal vapor and soot, so sufficient protective measures must be taken during operation. Welding is not suitable for the welding of high-carbon steel, due to the process of metal crystallization and segregation and oxidation of the welded weld, the welding performance of high-carbon steel is poor, and it is easy to crack after welding, resulting in hot cracks and cold cracks.

Mild steel has good welding performance, but the process should also be operated properly, rust removal and cleaning are more cumbersome, sometimes the weld will have slag cracks, porosity undercut and other defects, but proper operation will reduce the generation of defects.