WolframInertgas

WolframInertgas is the German term for tungsten inert gas welding, commonly abbreviated TIG or GTAW (Gas Tungsten Arc Welding). The process uses a non-consumable tungsten electrode to create an arc between the electrode and the workpiece, while an inert shielding gas protects the molten weld pool from atmospheric contamination. The shielding gas is typically argon, with helium sometimes added for higher heat input. Filler metal can be fed separately, enabling autogenous welds or welds with a precise filler addition.

Operation and materials: The process offers precise control of heat and filler delivery, producing clean, high-quality welds with good appearance. Most metals are welded with direct current (DC), either DCEN (negative) or DCEP (positive). Aluminum and some other alloys often require alternating current (AC) with balance control to manage oxide layers. Tungsten electrodes are selected by composition and sharpened to a point or truncated tip, depending on application. A TIG setup includes a power supply, a TIG torch, a shielding gas delivery system, and, if used, a filler rod and a control interface such as a foot pedal.

Advantages and limitations: TIG welding delivers high weld quality, excellent precision, and minimal distortion, making it suitable for thin sections and critical joints, as well as dissimilar metals in some cases. It is relatively slow and requires a skilled operator, with equipment that can be more costly and sensitive to drafts, moisture, and contamination.

Applications: It is widely used in aerospace, automotive, piping, and fabrication sectors, especially where appearance and weld integrity are paramount.