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Type of electric welding
Resistance welding
Arc welding
None
A and B
A and B
Electric welding is broadly categorized into two primary types: Resistance welding and Arc welding. Both methods utilize electrical energy to generate the heat necessary to fuse metals, making both options valid.
Electric welding is broadly categorized into two primary types: Resistance welding and Arc welding. Both methods utilize electrical energy to generate the heat necessary to fuse metals, making both options valid.
H=I2Rt тАФ Heat generated in resistance welding
P=VIcos╧Х тАФ Power consumed in arc welding circuits
Resistance welding operates on Joule's Law of heating (H=I2Rt), where current passes through the contact resistance between workpieces. Arc welding uses an electrical discharge (arc) between an electrode and the base metal, ionizing the air gap to sustain high temperatures sufficient to melt the material.
Resistance welding relies on the interface resistance of the workpieces.
Arc welding utilizes a plasma arc to reach temperatures exceeding 5000┬░C.
Both methods are essential in industrial fabrication and construction.
The power supply for arc welding typically requires a drooping V-I characteristic.
High production speed (Resistance welding)
Deep penetration and strong joints (Arc welding)
High initial equipment cost
Requires skilled labor for manual arc welding processes
Automotive chassis assembly (Spot welding)
Structural steel fabrication (Arc welding)
| Feature | Resistance Welding | Arc Welding |
|---|---|---|
Heating Mechanism | Joule Heating (I2R) | Electric Arc Ionization |
Resistance welding includes spot, seam, projection, and flash-butt welding.
Arc welding includes SMAW, MIG, TIG, and Plasma arc welding.
Option C is incorrect because both A and B are fundamental types of electric welding.
D is correct тАФ Electric welding encompasses both resistance and arc welding techniques.
Remember that resistance welding is often preferred for mass production due to automation, whereas arc welding offers greater versatility for on-site structural repairs.