Technologies used on Kharkiv Special Machine Plant


Plasma cutting



This is a kind of metal cutting with plasma jet used as a tool. Plasma cutting of metal is made in the following way: between the electrode and the metal being cut or between the electrode and the installation nozzle the arc is ignited. This process is carried out by a short circuit or a high-frequency pulse between the metal and the nozzle. Arc turns the gas supplied to the nozzle in the plasma jet under high pressure. Its temperature can reach 30,000 degrees, and the jet velocity – 1,500 meters per second. Plasma cutting ensures to cut up to 10 cm thick metal.

Metal plasma cutting provides high quality and production output. Plasma cutting resolves the following issue – there is no need to keep the metal in the weld pool, as it is in case of conventional arc welding, and pushing it out through a hole formed in the bottom of the bath requires solid burn, which is the cutting itself. Dividing plasma cutting is done with direct current of straight polarity. When cutting, good results are obtained by three-phase constricted arc. Plasma cutting of metal is used for the treatment of structural and corrosion-resistant (stainless) steel and 50-60 mm thick cast iron. By increasing the thickness, the main advantage of plasma cutting to oxygen cutting, output, is lost.



Argon arc welding



Hybrid gas and electric welding. It inherited electric arc from electric welding, similar method of welder - from gas welding.

Heart of argon burner is infusible tungsten electrode. It is commonly known that tungsten is a refractory metal (electric bulb filament is made from tungsten). Around the electrode there is a ceramic nozzle, from which argon inert gas is blowing during the welding. If you try to weld a piece without argon - aluminum just starts to burn, crack and cover by wretched crust. Argon protects welding spot from the air.

And the process is as follows. First, a "mass" is supplied to piece being welded as during conventional welding. The welder takes a burner in his right hand, and a filler rod - in the left one. When welding aluminum, then, of course, aluminum or from the special "AMG" or "AK" aluminum alloys. Although in 90% of cases usual aluminum electrical wire of required thickness is enough. The welder pushes the button on the burner, the current and gas supply are actuated. Between the not burnt tip and the piece there appears an electric arc. It serves as the main tool - melts the piece and a filler rod.



Many people wonder how reliable the welding is. It is as reliable as aluminum is a reliable metal. After welding, seams, overlapping, and a piece is an integral unit. Stainless steel, steel, cooper, iron, gold, silver, etc. can be welded with argon...