What is the Difference Between Spot Welding and Tack Welding?

The main difference between spot welding and tack welding lies in their purpose and the way they are performed:

Spot Welding:

• Spot welding is a permanent welding process used to fuse two metals together.
• It is carried out through a combination of electrical current and pressure applied to the metals being fused.
• Spot welding is widely used in industrial applications, particularly in the assembly of automobiles and other vehicles.

Tack Welding:

• Tack welding forms a temporary pre-weld.
• It is a preliminary process in many welding techniques, ensuring that parts to be welded together are held securely and properly aligned.
• Tack welding uses filler material when joining metal pieces.
• It can be used on a range of metals, each with varying thicknesses.
• Tack welding is typically performed before spot welding.

In summary, tack welding is a temporary process that holds parts together and ensures proper alignment, while spot welding is a permanent process that joins the parts together using electrical current and pressure.

Comparative Table: Spot Welding vs Tack Welding

Here is a table comparing the differences between spot welding and tack welding:

In summary, spot welding is a method used to fuse two metals together permanently, while tack welding is a temporary pre-weld that holds parts in the correct alignment until final welding is complete. Tack welding is especially useful in applications where only one side is accessible.