Guide To TIG Welding

(Last Updated On: January 7, 2021)

Tungsten inert gas (TIG) welding is also well known as gas tungsten arc. TIG welding offers a clean, solid weld joint that makes it suitable for assembling and repairing various aircraft components. We will discuss TIG welding’s basic theory in this article and discuss some tips for better TIG welding outcomes.

Fundamental Theory

In TIG welding, to create an arc on the base metal, a non-consumable tungsten electrode is used. The arc heat produced melts the base metal and creates a pool of welds. Unlike normal stick welding, an inert gas protects the weld area during TIG welding to prevent air from contaminating the weld. This shielding gas prevents the tungsten electrode, the molten weld puddle, and the heat-affected region adjacent to the weld bead from being oxidized.

An AC/DC welding machine with a stream of shielding gas is used in a standard TIG system. A regulator and flow meter go through the shielding gas and on to the torch. The torch has a collet/collet body combination that contains the electrode. The electrode is surrounded by a heat-resistant cup or ceramic nozzle and controls the gas shield. For high-amperage welding application, water-cooled TIG machines are also available for high amperage welding devices.

Personal Protective Equipment

While TIG welding does not produce any of the metal, spatter associated with stick welding, intense heat and light are still produced. In fact, up to twice the amount of infrared and UV rays than standard arc welding can be caused by the clearer atmosphere around the TIG arc.

Similar to serious sunburn, any skin exposed would be burnt. Personal protective equipment such as a welding mask, welder’s protective gloves, and footwear should be worn by welders. Of course, garments and accessories made of fire-resistant fabric and leather are recommended. They should not use cotton as it does not provide adequate protection and deteriorates quickly under the infrared and UV rays produced by the TIG welding process. A word of warning. Dark clothing can be used as a tip to minimize light reflection behind the helmet.

Other Safeguards For Protection

To shield you and co-workers from the dangers associated with TIG welding, you should observe the following general precautions:

Ensure that the electrical connection leads are in good condition before use and tight. To avoid unintended harm from hangar traffic, they should be secured. Make sure there is enough ventilation for you.

Gas Shielding

The gas used to protect the welding arc, and hot metals in TIG welding is an inert gas. Gases whose atomic structures do not cause them to react with metals or other gases are inert gases as the inert gas in TIG, argon, helium, or an argon-helium mixture is used.

Selection Of Proper Gas

With TIG, you want to make sure the right gas is used. Pure argon is typically used, although an argon/helium or another specialty mix may require thicker welding. The tungsten electrode can easily be consumed or deposited in the weld puddle if you use the wrong gas mixture, such as 75 percent argon/25 percent CO2 normal for MIG.

Level Of Gas Flow

Another essential element for effective TIG welding is to set a proper gas flow rate. More isn’t better, contrary to what might seem to be common sense. A flow rate of about 15 to 20 cubic feet per hour (cfh) is usually sufficient if you’re welding in a flat position.

Electrodes

Thoriated, lanthaniated, created, and pure tungsten is available in several different types of electrodes. Follow the advice of manufacturers when selecting an electrode, and select the right for you. Good ignition and re-ignition properties, constant arc, long lifespan, and high current-loading capability are some characteristics to consider in an electrode.

Practices Of Successful Welding

Start Cleaning up

A successful weld result needs to clean the area properly; you will be welding.

Remove the Oxides

Practice Makes Perfect

The best way to become a better welder is to practice, while instruction manuals and magazine articles are a good place to get basic knowledge. And practice some more after you’re done practicing.

With your welding equipment, you need to be at ease.

 

 

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