Argon welding. What is it?

The concept is very voluminous. It has wide range of its applications: from the repair of automotive radiators and aluminum parts of machines and mechanisms to the use of titanium and stainless pipelines on the installation, as well as the construction of containers from aluminum alloys and stainless steels and in the manufacture of interior structures. The use of argon-arc welding, or, as it is also called, argon, requires a serious knowledge of metal science, the concept of weldability of steels and alloys and a well-developed “feeling” of metal.
Let’s consider the basic directions of application of the given method for an interior design:

  • high-quality welding of stainless sheets with subsequent polishing of the surface, so as not to leave a “trace” of the place of docking.
  • making a joint at the border of profile or sheet pipes, bent elements, most of the interior design consists of. This process involves the subsequent polishing or polishing of the surface.
  • welding of copper, aluminum or brass. The next stage is the artificial rendering of the “obsolete” kind of product surface.

All of the above is possible only in the case of using modern knowledge in the field of welding, as well as a good equipment of production.

Argon welding technology

To apply this method, we need state standards, Regulating and facilitating the construction of the right technological process, aimed at establishing a quality welding joint: the installation of a pipeline or its repair, the manufacture and installation of tanks and capacitive equipment, the manufacture of industrial structures, as well as interior design or small-scale welding production.
The main list of standards applies to argon welding: 3242 Welding joints, 23870 Weldability of steels, 14782 Nondestructive testing, 16037 Welded steel pipe joints, 14771 Arc welding in shielding gas, 23518-79 Arc welding in shielding gases. The essence of this type of welding is an electric arc that burns from the tungsten electrode to the product, being in a protective gas atmosphere-argon, helium or mixtures of gases. The electric arc serves as a source of heating, which melts and welds the metal. For this purpose, inert gases are used, they are not flammable and perform the function of protecting the burning arc and the welding bath, i.e. welded product from the ambient air. If the protection of the welding tray is insufficient, the melted metal of the weld is deoxidized, which sharply reduces the quality of the welded joint and, accordingly, of the product. The amount of protective gas is determined by the external environment (the presence of wind, draft) and the current. At low current loads up to 60-80 A, the shielding gas consumption is set at 4-5 liters per minute. This amount is sufficient to protect the welding joint from the harmful effects of oxygen contained in the air. At higher current loads and conditions of external factors, the amount of inert gas can reach 15-18 l / m.
Most of the metals can be welded by argon-arc or argon welding:

  • Low-carbon and low-alloy steels: St-1, St-2, St-3, St-4, St-5, St-6, 15G, -20G; 15X; 1 5XA; 20X; 15XM; 14HGS, etc.
  • Cast iron: species with a carbon content of not more than 1.4%.
  • Stainless steel, alloy steel: 03Х17Н13М2, 02Х18М2БТ, 02Х28Н30МДБ, 03Х17Н13АМ3, 03Х17Н14М3, 03Х18АН11, 03Х18Н11, 03Х18Н11, 03Х22Н5АМ2, 03Х23Н6, 03Х24Н13Г2С, 06Х18Н11, 08X23H13, 08X25H4M2, 08Х12Т1, 08Х13, 08Х17Т, 08Х18Н10,06Х18Н11, 12Х19Н10Т and many others.
  • Titanium and its alloys: ВТ1-00, ВТ-0, ОТ4-0, ОТ4-1, ОТ-4, ВТ5-1, ВТ-5, ВТ-6, ВТ3-1, ВТ-8- ОСТ 90013-81
  • Aluminum: AMZ, AMC, AMg2, AMg3, AMg4, AMg5, AMg6, AMg6M, AB, D1, AL1-AL13-GOST 2685-44, etc.
  • Copper: M0, M1, M2, M3, M4 according to 859-41 standard.
  • Brass: L-62, L-68, L-70, L7777 according to 1019-47standard.

The application of this welding method is also great:
Interior designs, stainless steel furniture, stainless steel fencing, accessories for swimming pools and saunas, bathroom decor elements, stainless furniture, cafe and restaurant design, interior design, design of entertainment centers and welding of stainless elements, interior-furniture, additional elements of the interior, exclusive furniture, stairs, the production of tiles from stainless sheets, handrails and interior design, décor, construction, home and interior, stainless steel kitchens, decorative elements interior, fencing systems, production of interior designs, composite solutions for home interiors, interior and exterior design, hi-tech style.
Manufacture of stainless steel and titanium containers, repair and installation of process pipelines at food and chemical industry facilities, restoration and repair of worn out or out-of-date parts, mechanisms, products- repair of automobile cooling radiators and air conditioners, aluminum units and blocks of cars, boats, yachts, household appliances and much more.
This type of welding is used in food, chemical, pharmaceutical, oil refining, gas, automobile, shipbuilding, agro-industrial complex, and the space industry.
Today, argon-arc welding is the most widely used in the work with non-ferrous metals. With a lot of advantages, such as: high uniformity of the welded weld metal, the ability to work with small wall thicknesses of the product, the simplicity of the technological principle, a wide range of applications, there are also “minuses” of its application: poorly suited for products with large wall thicknesses, the length of the seams, and the relatively slow welding process, as well as the occurrence of welding deformations. In this case, it is advisable to use other types of welding, such as MIG / MAG-which gives a higher welding speed and a greater amount of weld metal.In modern industry, for the higher profitability of the welding process, there are often alternating types of welding: argon-arc standard 23518-79 WIG / TIG – manual arc MMA 11534-75, as well as argon arc WIG / TIG- semi-automatic MIG / MAG 11513- 75. Welding technology has significantly stepped forward in its development over the past few years. There are welding machines of well-known firms: Migatronic, Kemmpi, EWM, Fronius, ESAB, etc., which have a wide range of welding functions, allowing the welder to achieve high quality of his activities.
The authors of the article hope that this information has become useful and broadened your idea of argon-arc welding.

Application of argon arc welding for the installation of process pipelines. SNiP 3.05.05-84 Technological equipment and technological pipelines.

Let`s consider the application of argon welding for pipelines repair and installation.
Technological pipelines are pipelines through which the delivery and removal of process fluids (medium) takes place, to ensure the functioning of the enterprise, plant, shop. Such pipelines are used practically in all branches of industry: chemical industry, food industry and breweries, pharmaceutical, agriculture and industrial complex, metallurgical branch. Pipelines can be made of various materials: low-medium-carbon steels, low-medium-high-alloy steels, titanium and its alloys. The most of steels used for mounting technological pipelines are stainless steels: AISI-304; 308; 316; 321, according to euro norms: EN-1.4301, 1.4307, 1.4404.1.4878, as they provide sufficiently high corrosion resistance for slightly aggressive environments: product delivery systems, washing systems for food and chemical enterprises, technological blocks and communication blocks, pipelines and pipelines, pipelines industrial enterprises, internal shop and interdepartmental pipelines, strapping pipelines. In the case of a high aggression environment (chemical plants using chlorine), it is advisable to use pipes made of titanium and its alloys or high-alloy steels that provide enhanced corrosion resistance to the medium used.
For the installation of process pipelines, the corresponding supports are used, which are manufactured according to: 14911-82, 36-94-83 standards. Pipeline supports can be made of different materials, which is determined by the environment of their use.The most accessible type of welding for these works is argon-arc welding.
The technology of this welding is quite simple: In an inert gas environment – argon or helium, the electric arc burns. The electrode is non-melting, since it has a very high melting point, the electrode material is tungsten. The welder performs the work by feeding the welding rod into the fusion zone (welding tray). The welding process can also take place without the addition of filler material to the welding tray, this function is assumed by the metal of the pipe – the base metal and this method is called the pendel.
For qualitative welding of the pipe joint, it is necessary:
1. Fine adjustment of the welding current and the capabilities of the welding machine.
2. Presence of mounting equipment.
3. The experience of the welder – welding joint.
Pipes used for installation can have a different diameter – from 10 mm to 1021 mm. and more, different thickness of the pipe wall.
Accordingly, a pipe having a wall thickness of up to 2.6 mm can be welded without cutting the edges, which in turn involves welding with or without filler material. Pipes having a wall thickness of more than 3 mm are welded to the cutting edge, i.e. at a certain angle, the end of the pipe is cut to provide access to welding manipulations inside the welding joint. The welding process must ensure the province, the formation of a continuous weld inside the welding joint (pipe).
In order to ensure the performance of the cook, i.e. quality welding joint, a sufficiently high level of preparation of the welding specialist is necessary.
In Ukraine, there are highly skilled specialists who work in the field of installation of technological pipelines of medium and high alloy steels, having the necessary welding equipment and accessories for professional pipe mounting.