MIG welding on modern equipment
Now it is impossible to imagine the production,which could do without the help of welding. This process as a way to connect completely different parts from a durable material has found the widest application. After all, in most cases, welding is the only effective way of combining metals and structures. With such a demand, the progress of this technology can not wait and develop with the times. Below we will consider the main milestones and directions of modern welding.
Welding MIG, MMA
Manual Metal Arc is literally translated into Russianas "manual arc welding with piece electrodes." This method of connection is a pioneer in the path of welding progress. Such a process is less technologically advanced than others, which we will discuss below, but to this day remains the most reliable.
The principle of operation is as follows: Both the electrode and the welded article for burning the welding arc are reported with a constant or alternating current. The electrode with the help of an arc connects parts of the metal, forming a weld pool of metal and an electrode, while the molten slag comes out to the surface of the seam.
Progress of welding machines
Modern welding technologies with the MIG index,MAG, TIG are one of the most modern methods of arc welding and at this stage of development of the world industry are used literally everywhere. A novice welder does not always know what it is - MIG / MAG welding. The definition of this process is as follows: this is the process of joining parts of metals, in which a special protective gas is supplied to the burning zone of the electric arc, pushing atmospheric gases out of the weld metal zone. This is the protective function of the gas. With MIG welding, the weld pool is completely protected from oxygen and nitrogen.
The main differences between MIG and MAG welding
However, a more experienced welder knows what it is like- MIG and MAG-welding, than these species differ from each other. The differences lie in the name and their translation. MIG (Metal Inert Gas) is translated as "metal, inert gas".
Argon is included in these inert gases. These gases are relevant for welding aluminum, copper, titanium and all sorts of alloys. MAG (Metal Active Gas) is translated from English as "metal, active gas". Among these gases are oxygen, carbon dioxide and hydrogen. This gas is used for welding baths of low-alloyed, undoped and corrosion-resistant steels.
Principle of operation of a semi-automatic welding machine
Principle of operation of the semiautomatic device in the first placeis that the wire electrode itself, which when hand-welded by a specialist, feeds independently with the help of a hand and a holder, is fed in the semiautomatic device by means of an engine. Therefore, this method is called semi-automatic MIG welding.Wire performs a dual function - itis both a conductive electrode and a filler material. The electric current is supplied shortly before the electrode exits the burner, with the appearance of an electric arc between the end of the wire electrode and the metal.
The protective gas is fed through a gas nozzle,surrounding wire electrode. Burning gas due to inertia displaces all atmospheric gases, preserving the strength of the structure of the welded seam. However, in addition to the protective function, the gas also performs peripheral tasks. The protective gas depends on the composition of the atmosphere in the arc zone, which also positively affects its electrical conductivity.
In contrast to MIG-welding, Tungsten Insert Gas -this is manual arc welding, which is produced with a non-consumable electrode in a shielding gas environment by adding a wire. Also this type is called argon-arc welding. The essence of this process is as follows: a shielding gas is fed through the nozzle into the arc zone, while the non-melting electrode of tungsten does not melt, but is used as a tool for inserting a wire.
According to the classification, welding TIG, MIG, MMAbelongs to the class of manual arc. This type of welding is recommended for joining extremely small parts with a clearance of up to 0.01 mm. The main disadvantage of TIG-connection, in comparison with MIG-welding, is the speed, which is extremely low. If you need excellent quality, and you are in no hurry, this is the ideal choice for a welder-esthete.
Prospects of welding technologies
In this article, we learned about the maintypes of welding, which are popular and in demand at the moment at most large production facilities and in technological chains. Today, mainly used MIG-welding, TIG-technology, welding with electrodes and others. However, we did not mention automatic methods of joining parts used in industry.
If we go into the world of technologies thatare at the development stage, we will be able to trace the attraction to synergistic control schemes, when the setting on automatic systems of a parameter, for example, the thickness of the weld metal determines the appropriate wire feed speed, welding current and other parameters. This at times increases the comfort of work and the efficiency of production. Among other things, now, in the 21st century, welding is an independent type of production and contributes to the creation of fundamentally new designs. Welded parts serve at ultrahigh and ultra-low temperatures, at pressures, capable of operating even under conditions of cosmic vacuum.
Modern technologies in the field of welding allowwork even with plastics, glass, ceramics and other materials. Recently, welding has been used even for the connection of soft living tissues. Therefore, this profession will develop, improve and remain the same in demand, as well as throughout the history of man and progress. And the work of such specialists will and will remain important and necessary.