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Tig Welding by St. Ann's Sheet Metal Company

Tig Welding

Engineering

In TIG Welding (Tungsten Inert Gas Welding) the Tig Welder strikes an arc between a tungsten Tig welding electrode and the workpiece.

A separate Tig welding filler wire can be added to the weld pool as necessary. The weld pool is protected from oxidisation by pouring an inert welding gas (usually Argon) over the weld pool, this welding gas is usually turned on and off by the Tig Welder.

Tig welding is fairly easy to learn and is probably the most versatile of the arc welding processes, the down side is that it is slow and a good quality Tig Welder can be expensive.

Tig Welding equipment falls into two basic categories, a DC Output Welding Current Tig Welder can be used for most applications including the Tig Welding of Steel, Stainless Steel and Copper. A Tig Welder with AC and DC Output Welding Current can also be used for Tig Welding Aluminium and Aluminium Alloys. AC/DC Tig Welding equipment is essential for welding aluminium, however, these Tig Welders are significantly more expensive than a DC only Tig Welding equipment.

DC Output Tig welding equipment has two sub types:

Scratch/Touch Start Tig Welding Equipment – this is the least expensive and most basic form of Tig Welding equipment and relies on the tungsten Tig welding electrode being touched down onto the job then lifted off to form a welding arc (much the same as MMA welding). Such a Tig Welder is, in fact, an Arc Welding Inverter with a Scratch Start Tig Welding Torch added. The limitations of such a Tig Welder is that the tungsten Tig welding electrode will try to stick to the workpiece when it is touched down and the Tig welding torch is permanently live. The Welders Warehouse would only suggest this type of Tig Welding equipment to customers who primarily want to arc weld, but may, occasionally, want to do some basic Tig Welding.

High Frequency Start Tig Welding Equipment – this type of Tig Welding equipment uses a burst of high frequency (HF) to establish the welding arc. This is easier and more precise than a Scratch start Tig Welder as the tungsten Tig electrode does not have to be touched down. Additionally, an HF start Tig Welder will usually have additional useful features such as Slope Down and Post Gas Flow.

Tungsten Tig Electrodes
Two key types of Tungsten Tig Welding Electrode are available, Thoriated (red tip) for DC Tig Welding applications and Zirconiated (white tip) for AC Tig Welding applications. When a Tig Welder is in AC welding mode, the welding arc will cause the tungsten to "ball" at the end. The diameter of this ball should not exceed the diameter of the tungsten, if it does a larger tungsten should be used. When a Tig Welder is in DC welding mode, the tungsten should be ground to a point. This point should be as sharp as possible with the grinding lines running from the point, down the length, NEVER around the point.

Tig, gas, inert, tungsten, welding Product code: Tig Welding
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0115 926 9649 Eagle Close Brookfield Road, Arnold Nottingham Nottinghamshire NG5 7FJ
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