What is Scratch start Tig?
Scratch start TIG welding, also known as touch-start TIG welding, is a welding process that involves striking the tungsten electrode against the metal surface to create an arc and initiate the welding process. This method creates a spark that initiates the arc and melts the metal, creating a weld.
Scratch start TIG welding is a relatively simple and easy method to use, making it a popular choice for beginner welders. It requires minimal equipment and can be used for welding a variety of metals, including steel, stainless steel, aluminum, and copper. Scratch start TIG welding is often used for small welding jobs or for welding thicker materials where precise control of the arc is not as important.
However, scratch start TIG welding has some disadvantages. The arc created by this method can be difficult to control, which can result in an inconsistent weld. The scratching motion can also leave tungsten particles on the metal surface, which can contaminate the weld and cause defects. This method can also create a rough and uneven surface on the metal, which may require additional post-weld cleanup.
Despite its limitations, scratch start TIG welding remains a popular method for many welding applications. It is simple and easy to use, making it a good choice for beginner welders or for smaller welding jobs. However, for more precise and consistent welding, other methods such as lift arc TIG welding may be a better choice.