Technology

  Quality, efficiency and innovations.

Surface processing is distinguished by several different processes, such as curing, modification, alloy production and coating. When curing, you can achieve a precisely defined width and depth of hard layers.

Modification of the surface involves eg re-melting or hardening.

During melt manufacturing, gas or solid materials are fed to the surface to selectively alter the properties of the surface layer. When coating a workpiece, a corrosion and wear resistance layer is applied. These processes typically use argon as the shielding gas, and processes are performed at low power of the unoccupied or defocused beam.

Laser cutting is gaining popularity as one of the main methods of steel cutting. This is due to high precision, high quality cut parts and amazing cutting speed. Laser cutting technology makes it easy to cut steel and other materials with precision much higher than those offered by other technologies.

Laser cutting is a modern machining method with similar dimensional parameters as classical mechanical machining. The basic difference lies in the cutting agent used, which in the case of laser cutting is a hot laser beam and a high purity technical gas. Depending on the device used (especially its power), cutting is carried out in three ways: by burning, melting or sublimation.

  Laser processing

By using a laser, you can manage a variety of cutting tasks: from micrometer-sized slits in semiconductor to quality cuts in 30-millimeter steel.

Laser cutting, thanks to the use of modern technology, is becoming a more popular method. Laser cutting of sheets and other materials consists in directing them to a Fiber laser beam. Thanks to this technology it is possible to achieve exceptional accuracy, as the beam is computer controlled and can reproduce even the most complex shapes that would not be possible to reproduce by hand. Laser cutting is used primarily for these projects, where we care about accuracy, machining precision and speed.

During melt manufacturing, gas or solid materials are fed to the surface to selectively alter the properties of the surface layer. When coating a workpiece, a corrosion and wear resistance layer is applied. These processes typically use argon as the shielding gas, and processes are performed at low power of the unoccupied or defocused beam.

Laser treatment is increasingly used in the heavy industry. The reason is that the laser radiation is capable of performing many precision machining operations on a variety of materials, in different thicknesses and at different speeds.

  Laser cutting

Due to the excellent quality of the radius, fiber lasers are the optimum choice for cutting and precision welding, micro laser processing and marking. With the use of fiber lasers, narrow welds are created in precision welding and narrow cuts are obtained with precision welding - even at high working distances.

Laser cutting is distinguished by oxygen cutting and inert gas cutting, eg with nitrogen or argon. Cutting quality is exceptionally good ("laser quality"): precise contours, parallel cutting edges, surface smoothness, no burrs, no undercuts,

The most important advantages of steel laser cutting are:

  • High quality and precision cutting,
  • A small heat-affected zone,
  • High speed of work,
  • Short lead-time,
  • Material savings,
  • Smooth and clean surface,
  • No need for further edge machining,
  • Ease of automation of the process,
  • Repeatability of products.

 Laser welding.

Laser welding is one of the most modern processes of combining metals and their alloys, competing with their technological characteristics with electronic welding. Allows a durable, weld without additional weld. Laser welding thanks to high welding speeds significantly increases the productivity of the production process. In addition, this technology enables the creation of welds that will provide aesthetic appearance to the products. Laser welding makes it possible to make any type and shape of joints in any position. It covers the thickness range from the thinnest films and wires manufactured to 12.5-25 mm.

Laser welding uses a high energy density beam (about 1 MW / cm²). Concentrated coherent light beam overhands the contact area of ​​the connected objects.

The width of the obtained welds is 0.2mm to 13mm. In practice, welds with small widths are mainly used. The laser beam welding process can be controlled both by the power of the power supply and by the location of the beam focus point.

Low power lasers are used in spot welding electronics. High power lasers (over 1.5kW) allow the welding of larger elements up to 25mm thick. The laser power for industrial welding applications is from 1 to 6 kW.

With this technology you can combine all the metals and alloys welded electronically. In addition, there are no restrictions on the welding of unmatched steels, porous materials, sintered steels, etc., as is the case with electronic welding. Laser welding is especially suitable for combining a large number of small objects with a small thickness of more than 1200 joints per hour. Laser welding is also used to connect a portion of the gears, flat but peripheral butt joints of various supporting structures, longitudinal welding of pipes, especially in the food industry, sections, tubes with screen plates and the like with thicknesses of up to 25 mm.

Laser welding is widely used in the aerospace, electronics, food, electrical engineering, medicine industries - providing excellent quality and high performance.

 Hybrid welding.

Hybrid welding allows modernization of technological processes, as well as the production of new generation products, technologically advanced products made of special materials and constructed in such a way that the only welding power available for the process of combining them is the beam of laser radiation.

Hybrid laser arc welding (HLAW) combines the advantages of laser welding and the GMA method - arc welding with a hot electrode. As a result of the combination of two independent welding processes into a single hybrid process, we obtain a synergistic effect of both heat sources and the hybrid welding process has the same advantages as individual processes. Laser beam allows for deep and narrow infiltration with low linear energy, thus eliminating deformation and welding stresses. On the other hand, the use of the GMA wire leads to the filling of the welding groove with the molten electrode material, and the lower cooling speed contributes to lowering the hardness of the welds.

The main feature of this method is to maintain a high process speed and to obtain welds with much higher degree of flexibility than laser welding. In a single stitch, the hybrid welding process achieves results that typically require multi-layer arc welding. Welds made by hybrid welding are of high quality. The figure below shows the cross section of welds made by individual methods.

Application:

The hybrid welding method is mainly used for connecting butt plates in the thickness range from 2 to 10 mm (at higher thicknesses in several passages), pipe welding and fillet welds (in several passages) for a wide range of materials:

  • alloyed and alloyed steels,
  • aluminum and its alloys,
  • Ni-Cr alloys,
  • bodywork (and other coated).

 Laser hardening.

Laser hardening is performed to obtain a hard and abrasion-resistant top layer structure. Can be used for all materials that are subject to fire and inductive quenching. This technology is fully automatic, enables hardening of flat surfaces, cylindrical and complex geometry parts (multi-line, press brakes, marionettes, punches, molds). As a result of the process, we obtain a finer crystalline network compared to furnace and inductive quenching.

This process involves heating the outer layers of the material processed by the laser beam to an austenitic transition temperature of about 730 ° C per second. This results in the homogenization of the carbon atoms and the austenite expansion in the material. Depending on the material, the austenitic transformation temperature is from about 900 ° C to 1400 ° C and its holding time is from about 3 seconds to 10 seconds. Once the target temperature has been reached, the laser beam moves to the next part of the surface and the surface to which the laser beam stops decreases spontaneously. The process is controlled to the melting point. Thanks to fast cooling the material structure does not return to its original form and forms a very hard martensitic structure. The laser hardening method is environmentally friendly as it does not require additional cooling media such as water, oil or compressed air.

The resulting hardness corresponds to the upper limit of martensitic transformation and the depth of hardening depends on the type of material and is from 0.1 to 0.2 mm at a hardness of 35 to 68 HRC (depending on the chemical composition).

The use of laser hardening allows the machining of parts that have not yet been quenched by other methods. This creates new opportunities for construction and development.

Laser hardening technology is practically applicable in all industries:

  • metallurgy,
  • steel processing
  • machinery industry,
  • aviation, power industry,
  • automotive industry
  • mining and drilling.

 Laser deposition.

Laser Deposition Technology (LDT) is a process in which a powder or a solid wire material is introduced into a focused beam of high power under controlled atmospheric conditions. The laser beam melts the metal surface to form a small base material. The powdered material is continuously supplied to the basin of the base material and melted there at a very high velocity so that a thin melt film of the native material and powder is formed on the surface of the deposited element. It creates a high quality metallurgical connection of the deposited layer to the substrate. The whole process takes place in an inert gas casing at a speed of around 10 ° C / s. This provides a very high metallurgical purity and a fine grain structure. Laser deposition is only carried out automatically or in a robotic manner.

The ability to control with high accuracy of the melting depth of the native material makes its share in the drink can be very small, from about 3-5% to 10%. This is a particularly important when the chemical composition of a welded material differs significantly from the chemical composition of the native material. This means that the required performance is already in the first layer and the final machining allowance does not exceed 0.1-0.3 mm. Depending on the technology used (the type of device, the shape of the additive material), it is possible to make in one pass 0.1-5 mm and widths up to 5-20 mm at the straight line of the laser head.