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Working principle and characteristics of an electric welding machine.

Views:1718     Author:Site Editor     Publish Time: 2020-12-28      Origin:Site Inquire

The electric welding machine uses the high-temperature arc generated when the positive and negative poles are instantaneously short-circuited to melt the solder on the electrode and the material to be welded, and the purpose of combining the objects to be contacted. Its structure is very simple, it is a high-power transformer.


Electric welding machines can generally be divided into two types according to the output power source, one is AC power and the other is DC. They use the principle of inductance, the inductance will produce a huge voltage change when the inductance is turned on and off, and the high voltage arc generated when the positive and negative poles are short-circuited instantaneously is used to melt the solder on the electrode to achieve the purpose of atomic bonding. 

electric welding machine

●Features


⒈Advantages of electric welding machine: electric welding machine uses electric energy to convert electric energy into heat energy instantly. Electricity is very common. The electric welding machine is suitable for working in a dry environment and does not require too many requirements. Because of its small size, simple operation, convenient use, and fast speed, After welding, the advantages of strong welds are widely used in various fields, especially for parts requiring high strength. It can instantly connect the same metal materials permanently. After heat treatment, the welds will have the same strength as the base metal. The sealing is very good, which solves the problems of sealing and strength for the manufacture of storage gas and liquid containers.


⒉Disadvantages of the electric welding machine: During the use of the electric welding machine, a certain magnetic field will be generated around the welding machine. When the arc burns, radiation will be generated to the surroundings. The arc light contains infrared rays, ultraviolet rays, and other light species, as well as metal vapor and smoke, and other harmful substances. Therefore, adequate protective measures must be taken during operation. Welding is not suitable for high-carbon steel welding. Due to the process of crystallization, segregation, and oxidation of weld metal, the welding performance of high-carbon steel is poor, and it is easy to crack after welding, resulting in hot and cold cracks. Low carbon steel has good welding performance, but the process must be handled properly. Dusting and cleaning are more cumbersome. Sometimes the weld will have defects such as slag inclusion, cracks, pores, and undercuts, but the proper operation will reduce the occurrence of defects.


●Principle


It uses the high-temperature arc generated when the positive and negative poles are short-circuited instantaneously to melt the solder and the material to be welded on the electrode to achieve the purpose of combining them. The structure of the electric welding machine is very simple. To put it bluntly, it is a high-power transformer, which converts 220/380V AC into a low-voltage, high-current power supply, which can be DC or AC.  Welding transformers have their own characteristics, that is, they have a sharp drop in voltage. After the electrode is ignited, the voltage drops. In the adjustment of the working voltage of the welding machine, in addition to the primary 220/380V voltage conversion, the secondary coil also has a tapped voltage conversion, and at the same time, it is adjusted by an iron core. The adjustable iron core welding machine is generally It is a high-power transformer, which is made by using the principle of inductance. The inductance will produce huge voltage changes when it is switched on and off. The high voltage arc generated by the instantaneous short circuit of the positive and negative poles is used to melt the welding rod. Solder to achieve the purpose of combining them. A voltage is applied between the electrode and the workpiece, and the arc is ignited by scratching or contacting, and the energy of the arc is used to melt the electrode and heat the base material.

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