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Arc welding is
Plastic welding
Pressure welding
Non pressure welding
None of these
Non pressure welding
Arc welding is classified as a non-pressure welding process (fusion welding) because the joint is achieved by melting the parent metal and filler material without the application of external pressure. The heat required for melting is generated by an electric arc established between an electrode and the workpiece.
Arc welding is classified as a non-pressure welding process (fusion welding) because the joint is achieved by melting the parent metal and filler material without the application of external pressure. The heat required for melting is generated by an electric arc established between an electrode and the workpiece.
H=I2Rt
P=VIcos╧Х
An electric arc is formed by ionizing the air gap between the electrode and the base metal using a high voltage source. The massive flow of electrons creates intense heat (T>3000┬░C), causing the metal surfaces and the filler rod to melt into a common pool known as the weld pool. Upon cooling and solidification, a strong metallurgical bond is formed.
Arc welding relies on thermal energy from an electric discharge.
It belongs to the category of Fusion Welding (Non-pressure welding).
Filler metal may or may not be added depending on the application.
Shielding gases or flux are used to prevent oxidation of the molten pool.
High deposition rates
Portable equipment
Suitable for thick sections
Produces harmful UV radiation
Requires skilled operators
High heat input leads to distortion
Structural steel fabrication
Pressure vessel manufacturing
Shipbuilding and pipeline welding
| Feature | Pressure Welding | Non-Pressure Welding |
|---|---|---|
Requirement | External Pressure | No External Pressure |
Pressure welding (like resistance welding) requires force to join surfaces.
Arc welding relies solely on heat to create a molten state that forms the joint.
Common types include SMAW, GMAW (MIG/MAG), and GTAW (TIG).
C is correct тАФ Arc welding is a non-pressure (fusion) welding process because it joins metals using heat alone without the application of external compressive force.
Always remember that resistance welding is a 'pressure' process, while arc and gas welding are 'fusion/non-pressure' processes.