The Benefits and Process of Spot Welding in CNC to get a broken tap out Rae)

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Spot welding is a widely used technique in the field of CNC machining, offering numerous benefits and applications. This article aims to provide insights into spot welding, its process, advantages, and how it plays an integral role in CNC machining operations.

Spot Welding in CNC Machining:

Spot welding is a method that joins two or more metal parts together by applying heat and pressure at selected spots. It involves localized fusion of the material where the metals are held firmly between two electrodes. In CNC machining, spot welding finds extensive usage in various industries, including automotive, aerospace, electronics, and appliance manufacturing.

The Process of Spot Welding:

Spot welding primarily relies on resistance heating, resulting from the passage of electric current through the materials being joined. The welding machine consists of two copper electrodes; one is stationary while the other applies force to hold the materials together.

1. Preparation: Before initiating spot welding, the surfaces to be welded must be appropriately cleaned and free from contaminants like oil, rust, or dirt. This ensures proper contact and reduces electrical resistance during the welding process.

2. Electrode Placement: The electrode tips are brought into contact with the desired welding points, ensuring proper alignment for effective heat transfer. Typically, the electrodes exert force for a specific duration, depending on the material thickness and type.

3. Current Application: Once the electrodes are in position, an electric current passes through them, generating intense heat at the point of contact. As the temperature increases, the metals melt, forming a fused joint.

4. Cooling and Solidification: After the desired amount of energy is applied, the current is stopped, and the molten metal cools rapidly under pressure. This helps in solidifying the weld, creating a strong bond between the materials.

Advantages and Applications of Spot Welding:

1. Speed and Efficiency: Spot welding is fast and efficient, making it ideal for high-volume production scenarios. This technique excels in joining thin metals quickly, significantly reducing assembly time.

2. Cost-Effective: By eliminating the need for additional materials such as bolts or adhesives, spot welding provides a cost-effective solution. It requires minimal energy consumption, resulting in reduced operating costs.

3. Strong and Reliable Joints: Spot-welded joints possess excellent strength and reliability, often exceeding the parent material's mechanical properties. This ensures that the welded components can withstand various loads and stresses during their lifespan.

4. Versatility: Spot welding works well with different types of metals such as steel, aluminum, copper, and their alloys. Its adaptability makes it suitable for diverse industries ranging from automotive body structures to electronic circuitry.

5. Compact Design: Due to its localized nature, spot welding allows for smaller weld areas, minimizing heat distortion on surrounding parts. This is crucial when working with delicate components that require precise manufacturing tolerances.

6. Automation Capability: Spot welding machines can be easily integrated into CNC machining processes, allowing for automated production lines. Robotic spot welders ensure consistency and precision while enhancing overall productivity.


Spot welding plays a vital role in CNC machining operations, offering great advantages such as speed, efficiency, and strong joint integrity. The ability to automate this process further enhances productivity while maintaining consistent quality control. As industries continue to evolve, spot welding remains a reliable method for creating durable connections between metal components. CNC Milling CNC Machining