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August 12, 2017 18:08

Gas welding - that provides the power of the flame ?

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essence of actions of technical gases for welding

types of welding, there are many.The division is based on the process for producing high-temperature weld pool (type of energy).For example, arc welding, ultrasound, and other gas flame.This burner can cut and weld all metals.Edge welded metal parts literally melted and, when combined, make up has a new single structure in place of the alloy, called weld.By welding

gases include, primarily, acetylene welding, secreted by the reaction of calcium carbide with water.Mixed with oxygen, it produces a flame temperature of over three thousand degrees.

welding also considered propane, butane, liquefied MAFy (new gases, who replaced acetylene), benzene, kerosene, and others.An important feature of the use of welding gases is the mandatory presence of oxygen as a combustion catalyst.Moreover, the quality (purity) of oxygen fed to the burner depends on the temperature and developed.

What should be the gas mixture for welding?

gas mixture for welding

using technically pure oxygen gives a very intense and complete combustion of the mixture itself or the vapors of flammable substances, since it provides very high combustion temperatures.The amount of oxygen in the flame or oxidizing determine its reducing properties.

On the other hand, the use of technical (pure) oxygen requires special containers for storage and delivery.In a mixture with oxygen or some gases may be explosive compositions (due to their extremely high speed in a combustion catalyst).

Often they may themselves be hazardous due to its toxicity.For example, acetylenes, cyanogen, etc.

Application of the oxygen contained in the air, makes welding gas mixtures are less effective.Their combustion is slowed, which sharply reduces the flame temperature.The reason is that the oxygen in the air is not more than the fifth part, the other gases present in the greater extent the same nitrogen, for example.

addition to the foregoing, welding conditions using atmospheric oxygen often does not provide the desired geometry of the connecting seam, it changes the properties of the metal in the zone, which ultimately affects the quality of the connection.

Shielding gases - what is it and what are?

Technical gases are used not only in welding.Widely used as shielding gases for welding the electric arc, and so forth. The use of various inert (helium, argon) or active (nitrogen, CO2, hydrogen, oxygen) gas as a protective atmosphere for the bath of welding melt improves quality of the result, increases the rate of work,It allows to obtain the desired weld settings, etc.

welding principle of shielding gas is easy.The desired composition is fed into the arc zone through steps pressurized special burner nozzle, creating the most protective environment.On this principle, built popular welding semiautomatic.

Such welding is available not only in the factory, it is widely used in shops and even in private garages.The most common gas welding semiautomatic a mixture of inert and carbon (in various proportions).More applicable inert helium and argon.In practice to use argon therefore present in the composition and CO2 and argon.

Generally inert gas welding is needed as a protecting molten bath from the outside air impact, and if necessary quality of the welding work on stainless steels, titanium and alloys thereof, nonferrous metals (nickel, copper, aluminum and alloys), etc.. In this case, the electrode can be anything: classic consumable, does not change its shape and structure (which serves to create an arc), etc.

can choose the desired effect for the welding gas it is a metal used in the work.The same mixture of CO2 and argon in welding of the steel contains more carbonate component (about 18%).And when welding stainless steels prevails argon (98%), CO2 accounts for only two per cent.

Thus, a gas used for welding metal is determined by its brand name, the required properties seam kinds of welding equipment, requirements for chemical composition and even the shape of the joints, working conditions, etc.

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