Tungsten Inert Gas (TIG) welding, also known as Gas Tungsten Arc Welding (GTAW), is a welding process that utilizes a non-consumable tungsten electrode to produce the weld. Also, the electrode is protected by an inert gas shield, usually argon or helium, which prevents contamination of the weld area.
TIG Welding Process
Here’s an overview of the TIG welding process:
- Equipment setup: TIG welding requires a welding machine with a power supply, a TIG torch, a shielding gas supply, and a ground clamp. The machine is typically set to direct current (DC) for most applications, but alternating current (AC) can also be used for certain materials.
- Electrode preparation: The tungsten electrode used in TIG welding is prepared by grinding it to a point. The shape and size of the electrode tip depend on the application and the material being welded. The electrode is then inserted into the TIG torch and tightened securely.
- Gas shielding: An inert gas, such as argon or helium, creates a shielding atmosphere around the weld area. The gas is usually supplied through the TIG torch. Also it flows out to protect the electrode and the weld puddle from atmospheric contamination.
- Welding technique: The TIG welding process requires precise control and coordination. The torch is held at a specific angle, usually around 10-15 degrees, and filler metal may be added manually to the weld joint, depending on the requirements.
- Arc initiation: The welding arc is initiated by bringing the tungsten electrode close to the workpiece. Slowly withdrawing it while simultaneously striking an arc. High-frequency or lift-start methods are commonly used for arc initiation.
- Welding process: Once the arc is established, the welder moves the torch along the joint, creating a molten weld pool. The weld pool is protected by the inert gas shield, preventing oxidation and ensuring a clean weld.
- Filler metal addition: In some cases, a filler metal may be added to the weld pool to provide additional material. This will achieve the desired weld joint strength. The filler metal is manually fed into the weld pool by the welder using a separate filler rod or wire.
- Post-weld cleaning and inspection: After completing the weld, removing any slag or spatter from the weld area is essential. The weld can then be inspected visually or using non-destructive testing methods to ensure quality and structural integrity.
TIG welding is commonly used for welding thin sections of stainless steel, aluminum, copper alloys, and other non-ferrous metals. It offers precise control, and excellent weld quality, and can be used for a wide range of applications, including automotive, aerospace, and precision fabrication. Finally, contact us today for welding services and any other fabrication needs you have.