What is the principle by which the electric welding machine welds the iron together?

The welding rod you are talking about should be a welding rod for manual arc welding, and the powder form is flux, usually called coating, which is some gas-making and slag-forming materials.

Go to the small piece of iron and knock it, this "small piece of iron" is called the "arc striking plate", where the arc is triggered to protect the workpiece. When you ignite the arc, the temperature at the front end of the electrode is very high, and the electrons are very active, so it is easy to ignite again.

Electric welding is to generate an arc through electrical energy, the arc generates huge heat to melt the base metal and the electrode, and the molten droplets produced by the melted base metal and the electrode are fused together in the molten pool and welded together after recrystallization.

Welding: also known as welding, bonding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. Welding achieves the purpose of bonding through the following three ways:

1. Heat the workpiece to be joined to partially melt it to form a molten pool, and the molten pool will be joined after cooling and solidifying, and the melt filler can be added to assist if necessary;

2. Separate heating of the solder with a low melting point, without melting the workpiece itself, connecting the workpiece by the capillary action of the solder (such as soldering and hard welding);

3. At a temperature equal to or lower than the melting point of the workpiece, supplemented by high pressure, superimposed extrusion or vibration, etc., the two workpieces can penetrate and bond with each other (such as forging welding and solid-state welding).

The arc causes the coating reaction on the outside of the electrode to produce a high temperature, which melts the electrode core and welds the weld.

An electric welding machine is a special transformer. The difference is that the voltage drop is small when the transformer is connected to the load, and the voltage drop is large when the welding machine is connected to the load. This is mainly achieved by mediating the amount of inductance of the magnetic flux and series inductance, and the working principle of ordinary welding machine is similar to that of a transformer, which is a step-down transformer.

At both ends of the secondary coil are the welded workpiece and the electrode, which ignite the arc and weld the gap of the workpiece and the electrode in the high temperature of the arc.

Welding transformers have their own characteristics, that is, they have the characteristics of a sharp drop in voltage. The voltage drops after the electrode is ignited; When the electrode is short-circuited by adhesives, the voltage drops sharply. The reason for this phenomenon is the characteristics of the core of the electric welding transformer.

The adjustment of the working voltage of the welding machine, in addition to a 220 380 voltage conversion, the secondary coil also has a tap conversion voltage, and at the same time, there is an iron core to adjust, how much the iron core can enter, the shunt magnetic circuit, the more entered, the lower the welding voltage.

Although the circuit is closed, it is precisely because the circuit is closed that the entire closed circuit and the current are equal; However, the resistance is different everywhere, especially the resistance at the unfixed contact is the largest, and this resistance is called contact resistance in physics. According to the law of thermal effect of electric current (also called Joul's law), Q=I2RT can be seen that the current is equal, the higher the heat of the part with greater resistance, and the contact resistance of the contact point of the metal body is the largest when welding, and the electric heat generated in this part is naturally the most, and the welding rod is an alloy with a lower melting point, which is naturally easy to melt, and the melted alloy electrode core is cooled after being stained on the welded object, and the welding object is glued together. At this time, because the above-mentioned gap is very small at the moment when the electrode is lifted, the voltage between the electrode and the weldment is higher (60-70V), coupled with the above-mentioned preheating, the end of the electrode and the weldment being welded are easy to emit electrons, and the air at the gap is broken down and conducted, and a dazzling spark is produced at the same time, which is the arc discharge.

The temperature at the arc discharge can reach more than 2000K, and the electrode and weldment are melted, so that welding is realized. After the arc discharge starts, the voltage drop between the electrode end and the weldment (abbreviated as arc voltage) is about 30V, and the load formed by the arc is a resistive load.

1. The principle of electric welding:

The principle of electric welding is that in a closed circuit, the current is discharged in a place with large resistance, and the high-temperature molten metal generated by the discharge forms a molten pool, and the molten metals penetrate each other to complete the melting welding.

In the actual welding, the workpiece and the electrode are connected to the power supply and connected to different electrodes, and the electrode and the workpiece are in instantaneous contact to ionize the air to produce an arc, and the temperature of the arc can reach about 5000-6000K, so that the surface of the workpiece is melted to form a molten pool, and the electrode metal is mixed and filled in the weld with the melted base metal after melting, so that the surface of the workpiece forms a metallurgical weld.

During the welding process, the coating of the outer layer of the electrode plays a very large role in protecting the weld metal.

2. Wiring of the output circuit of the electric welding machine:

The AC welding machine is used to output the secondary coil of welding current, which has a high current and low voltage. The output voltage is about 50-80V AC. The secondary winding finally leads out two terminals, these two terminals do not have a grounding wire, any terminal is called grounding.

As long as the welding wire forms a closed loop with the wire called grounding, electric welding can be performed. That's where that grounding wire comes in.

The working principle of the welding machine: the high-temperature arc generated by the positive and negative electrodes in the instantaneous short circuit is used to melt the solder and the welded material on the electrode to achieve the purpose of combining the contacted objects.

Structure: It is a high-power transformer.

Welding machines can generally be divided into two types according to the type of output power supply, one is AC power supply and the other is DC power supply. The welding machine is suitable for working in a dry environment, does not require too many requirements, and is widely used in various fields because of its small size, simple operation, easy to use, fast speed, and strong weld after welding.

The principle of operation is simple, you just have to look up the book.

A welder is a device used to heat and melt metal materials for welding. Different types of welding machines have different working principles, and the following are two common working principles of welding machines:

The working principle of arc welding machine.

Arc welding machines are one of the most commonly used welding equipment. It works by converting electrical energy into electric current through a power source, and forming an arc through electric excavation, heating and melting metal materials under the action of the arc, and finally achieving welding.

Specifically, the circuit of the arc welding machine includes a power supply, an electrode, a workpiece, and a welding surface, and when the electrode is in contact with the workpiece, an arc is generated, and the metal material is heated and melted through the arc to form a weld. The welding effect of the arc welding machine is affected by a variety of factors, such as current intensity, electrode material, welding position, etc.

The working principle of the gas shielded welder.

Gas shielded welding machine is another common welding equipment, which is mainly used for welding stainless steel, aluminum alloy and other metal materials. It works by converting electrical energy into current through the power supply, so that an arc is formed between the electrode and the workpiece, and at the same time a shielding gas is sprayed to the welding area, so that the welding area is protected from air pollution.

Specifically, the circuit of a gas shielded welder includes a power supply, electrodes, workpiece, and shielding gas nozzles. When the electrode and the workpiece are in contact, the arc is generated, heating and melting the metal bent silver material, and at the same time, the protective gas is sprayed in the welding area to avoid the intrusion of air pollutants such as oxygen and water vapor, so as to achieve high-quality welding results.

In conclusion, the basic principle of the working principle of the welding machine is to convert electrical energy into electric current through a power source, and then heat and melt the metal material through an electric arc, and finally achieve welding. Different types of welders will have different working principles and techniques depending on the welding needs.

A welder is an industrial device used to heat and join metal parts together to create a permanent connection. It works by converting electrical energy into heat energy, through which the meganuclear metal material is partially melted, and the surface tension of the molten metal is used to form a continuous or partially continuous connection between two or more metal parts.

Common welding methods include arc welding, gas shielded welding, TIG welding, MIG MAG welding, etc.

Different types of welding machines work differently, but basically by applying an electric current to create a high temperature, the metal parts are partially melted, and then cooled and solidified to achieve a connection. The welding machine usually consists of a power supply, a welding head, a power transformer, and a corresponding control device.

When using, it is necessary to select the appropriate welding method, the appropriate electrode, the appropriate current and voltage of the composite wheel, etc., and carry out the welding operation according to the characteristics and requirements of the welded material.

The working principle of the welding machine is to convert electrical energy into heat energy, and heat the metal material to the melting point or high temperature state through the heat energy, so that it can be melted or softened and then cooled and solidified, so as to achieve the purpose of connecting, repairing or changing the shape of the metal material. Specifically, the welding machine transmits electrical energy to the weldment by controlling parameters such as current, voltage and time, so that it produces a strong thermal effect, so as to complete the welding process. Common welding methods include arc welding, gas shielded welding, resistance welding, laser welding, etc.

The electric welding machine uses the high-temperature arc generated by the positive and negative electrodes in an instantaneous short circuit to melt the solder and the welded material on the electrode to achieve the purpose of combining them. The structure is very simple, it is a high-power transformer, and the welding machine can be divided into two types according to the type of output power supply, one is AC power supply; One is direct current.

The principle of inductance is used, the inductance will produce a huge voltage change when it is turned on and off, and the high-voltage arc generated by the positive and negative poles in the instantaneous short circuit is used to melt the solder on the electrode to achieve the purpose of combining them.