Red Seal Welder Practice Exam

What primarily distinguishes TIG welding from MIG welding?

1. TIG uses a non-consumable tungsten electrode

2. MIG is always performed indoors

3. TIG welding is faster than MIG welding

4. MIG requires higher amperage settings

The correct answer is: TIG uses a non-consumable tungsten electrode

The primary distinction between TIG welding and MIG welding lies in the type of electrode used. TIG (Tungsten Inert Gas) welding employs a non-consumable tungsten electrode, which means the electrode itself does not melt away during the welding process. Instead, the heat generated by the electric arc melts the base metal to create the weld, while a separate filler metal can be added if needed. This process allows for great precision and is particularly suitable for welding thinner materials and producing high-quality welds. In contrast, MIG (Metal Inert Gas) welding utilizes a consumable wire electrode that is fed continuously into the weld pool. The wire melts as it is fed into the arc, which contributes not only to the weld but also serves as the electrode. This fundamental difference in the welding method and electrode type explains why the correct answer highlights the use of a non-consumable electrode in TIG welding. The other options presented do not accurately capture the primary distinction between these welding processes. For instance, MIG welding can be performed both indoors and outdoors depending on the specific requirements and equipment used. Additionally, TIG welding is generally considered slower than MIG welding, which is often more efficient for thicker materials and production settings. Amperage settings can vary in both