Which welding technique does scratching apply to?

Scratching refers to a technique used specifically in the context of TIG Welding. In this process, the welder initiates the arc by lightly scratching the tungsten electrode against the base material, similar to striking a match. This action produces a small arc, which then allows the welder to control the heat input and start the weld effectively.

The scratching technique is crucial in TIG Welding because it helps ensure a clean start for the arc without contaminating the tungsten electrode, which can happen with other methods. This method is particularly useful for thin materials where precise heat control is needed to prevent burn-through.

Understanding that this technique is unique to TIG Welding and not applicable to the other types listed helps clarify its significant role in achieving high-quality welds in this particular welding process.