What is the principle of spot welding?
It works by contacting copper alloy electrodes to the sheet surfaces, whereby pressure and electric current are applied and heat is generated by the passage of current through resistive materials such as low carbon steels.
What are the types of spot welding?
Spot Welding.
What is the maximum thickness for spot welding?
3 mm
Spot welding is primarily used for joining parts that are normally up to 3 mm in thickness. Thickness of the parts to be welded should be equal or the ratio of thickness should be less than 3:1. The strength of the joint depends on the number and size of the welds. Spot-weld diameters range from 3 mm to 12.5 mm.
How do you size a spot welder?
Diameter of the electrode contact surface should be slightly larger than the nugget diameter. For example, spot welding two sheets of 1 mm thickness would require an electrode with a contact diameter of 6 mm. In practice, an electrode with a contact diameter of 6 mm is standard for sheet thickness of 0.5 to 1.25 mm.
What joint is used for spot welding?
Understanding Different Welding Joint Types There are five basic welding joint types commonly used in the industry, according to the AWS: Butt joint. Tee joint. Corner joint.
What is the material of the electrode in spot welding?
The electrodes generally are made of a low resistance alloy, usually copper, and are designed in many different shapes and sizes depending on the application needed. The two materials being welded together are known as the workpieces and must conduct electricity.
What is Nugget Dia in spot welding?
The weld nugget diameter is defined as the average diameter of the major and minor button diameter determined by peeling one of the sheets back over the spot weld, leaving a hole in one sheet and a button of material attached to the other sheet.
What is the voltage for spot welding?
The open circuit voltage from the transformer is higher than this, typically in the 5 to 22 volt range. The resistance of the weld spot changes as it flows and liquefies.
What are the 4 basic weld joints?
There are five basic welding joint types commonly used in the industry, according to the AWS:
- Butt joint.
- Tee joint.
- Corner joint.
- Lap joint.
- Edge joint.
What are the 5 welding essentials?
WELDING PROCEDURES
- 5 essentials for proper welding procedures.
- 1) CORRECT ELECTRODE SIZE.
- 2) CORRECT CURRENT.
- 3) CORRECT ARC LENGTH or VOLTAGE.
- 4) CORRECT TRAVEL SPEED.
- 5) CORRECT ELECTRODE ANGLE.
- 8 FACTORS to consider in selecting arc welding electrodes.
