Which of the following welding processes uses vacuum?

Question

Which of the following welding processes uses vacuum?

LBW
EBW
Arc welding
Resistance welding

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

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AhmedNazir · Accepted Answer · 2022-09-04T04:29:57+06:00

Option 2 : EBW

Explanation:

Electron Beam Welding (EBW):

Electron beam welding joins metals by bombarding a specific confined area of the base metal with high velocity electrons.
The operation is performed in a vacuum to prevent the reduction of electron velocity.
It allows fusion welds of great depth with a minimum width because the beam can be focused and magnified.

Laser Beam Welding:

Laser Welding is a method in which the workpiece is melted and joined by a narrow beam of intense Monochromatic Light.

When the beam strikes the job, the heat produced melts and fuses even the hardest materials.

Resistance Welding Processes:

Resistance welding processes are pressure welding processes in which heavy current is passed for a short time through the area of interface of metals to be joined.

These processes differ from other welding processes in the respect that no fluxes are used, and filler metal is rarely used.

Electric arc welding

Electric arc welding is the process of joining two metallic pieces.
In this, the melting of metal is obtained due to the heat developed by an arc struck between an electrode and the metal to be welded or between the two electrodes.
For the arc welding, the temperature of the arc should be 3500° C.
At this temperature, mechanical pressure for melting is not required.
Both AC and DC can be used in arc welding.
Arc welding usually requires high current (over 80 amperes) and it may need around 12000 amperes in spot welding.
On the other hand, the voltage requirement is low for arc welding.
To get the required current and voltage, a welding transformer is required which converts the high voltage and low current into a low voltage and high current.