The heat required for melting and joining of the plates is obtained through electrical resistance of the circuit is called Resistance Welding Operation. It is classified as follows.
- Resistance Spot Welding
- Resistance Seam
- Projection Welding
- Percusion Welding
In this Article, I will be discussing the Resistance Spot Welding Operation in a detailed manner.
Resistance Spot Welding Operation:
- It is a Resistance Spot Welding process, in which two or more metal sheets are joined together by means of spot welds.
- The workpieces to be welded are pressed between the tips of Copper electrodes and high current at low voltages is passed through the workpieces.
- Due to the resistance offered by the workpieces ( sheet metal ) to the flow of current, the temperature at the contact surfaces rises to fusion point and the weld is formed in the form of a nugget.
- A nugget is a weld formed in between the workpieces.
- No filler material is used in the Resistant spot welding Process.
- The operation is repeated ‘n’ no. of times to get the spot weld at the desired location.
- The most commonly used electrode materials in resistance welding are Copper(Cu), Tungsten, Copper-Tungsten Alloy etc.
Advantages of Resistance Spot Welding
- Easy automation
- Low fumes
- No filler materials are required.
Disadvantages of Resistance Spot Welding
- Low strength in the case of discontinuous welds.
- High equipment cost.
- The thickness of welded sheets is limited – 6 mm only.
Applications of Resistance Spot Welding
Resistance Spot Welding is
- Used for joining of vehicle body parts
- Fuel tanks
- Railway tracks
- Pipes of gas oil and water pipelines
- Domestic radiators
- Turbine blades
This is the explanation of Resistance Spot Welding with its Concept, Advantages, Limitations, and Applications in a detailed way.
You can also Read:
- Welding-Definition, Applications, Methods of Joining, Weld joints, Coated Electrode
- Types of Welding Process-Fusion,Non-Fusion and Pressure welding
- Electric Arc Welding Process: Principle, Arc Welding Equipment, Applications
- Gas Welding: Oxy-Acetylene, Equipment Details, Types of Flames, Applications