12/27/2023 0 Comments Helium electric arcThe UV rays produced in TIG welding are brighter than other welding process. The coordination of hand and eye is very important and it requires a skilled welder.Deposition rate of the filler metal (or filler rod) is also low.The arc travel speed is slower than stick welding process.Disadvantages of Tig welding (GTAW)ĭisadvantages of gas tungsten arc welding are mentioned below. Tig welding is suitable for welding metals having less thickness (from 1 mm to 7 mm).Various types of metals (including similar metals and dissimilar metals) can be joined by using Tig welding process.Very less fumes are produced in GTAW process as compared to other welding process like stick welding.If the welding metal is free of contaminants, then there will be no issue of weld spatter.So the slag formation does not take place. There is no use of welding flux in TIG welding process.The arc produced by tungsten electrode is highly concentrated which results in very narrow heat affected zone (HAZ).The advantages of gas tungsten arc welding are mentioned below. Having said that, now let’s discuss the Advantages and Disadvantages of Tungsten Inert Gas welding (TIG welding). Inert gas cylinder, pressure regulator and flow regulator.Tungsten is a metal which has a high melting point (3410 ☌).Īlso tungsten is a strong emitter of electrons which provides the path to the arc, and helps in maintaining the stable arc. Why is tungsten electrode used in TIG welding? While for helium shielding, the voltage range is 15-25 V with current range of 50-250 amps. The Tig welding voltage range is between 10-15 V with the current range between 50-350 amps for argon shielding. Characteristics Argon Helium Argon + Helium Travel speed Reduced travel speed Faster travel speed Depends on mixture, more helium – more travel speed Penetration Reduced penetration Increased penetration Depends on mixture, more helium – improved penetration Cleaning Good cleaning action Less cleaning action Cleaning properties closer to argon Arc starting Easier arc starting Difficult arc starting Depends on mixture, more argon – more easier arc starting Arc stability Good arc stability Lower arc stability at lower current Depends on mixture, more argon – more stable arc Arc voltage Lower arc voltage Higher arc voltage Moderate arc voltage Flow rate Lower flow rate Higher flow rate Higher flow rate than argon Cost Lower cost and greater availability Higher cost than argon Comparatively higher cost due to argon What are the effects of different shielding gases on TIG welding?ĭifferent shielding gases and their effects are mentioned in the table below. The recommended dimensions of the tungsten electrode is mentioned in the diagram below. It is also necessary to have the proper sharpness of the tungsten electrode to achieve good quality welds. Tungsten electrodes used in TIG welding are somewhat expensive, but the advantage is that it can be used for a very long time. What should be the dimensions of tungsten electrode? GTAW process is also used for welding of dissimilar metals like copper with brass, stainless steel with mild steel. Gas Tungsten Arc Welding process (GTAW or TIG process) is generally used for welding of stainless steel, nickel alloys, titanium, aluminum, brass, bronze, magnesium as well as gold. In TIG welding process, sometimes hydrogen gas is added with the inert gases which helps in welding with higher travel speed. These gases are also odourless and transparent, so they do not disturb the visibility of the arc. The inert gases (i.e argon and helium) are chemically inert, meaning they do not react with the weld metal or any other gases. The inert gas (usually argon or helium is used) enters the TIG welding torch from the gas cylinder (see the image shown in the beginning of this article). You can see the inert gas shielding in the diagram above. During the Tungsten Inert Gas welding process, the tungsten electrode, heat affected zone (HAZ), as well as the molten metal are shielded with the shielding gas, which protects them from atmospheric contamination.
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