Technology tips

Monday, 21 August 2017

WELDING


Modern methods of welding can be classified, depending on the state of the material during welding (plastic or molten state), as follows:

    Plastic welding or pressure welding (explained below)
    Fusion welding or nonpressure welding (explained below)

They can also be classified, depending on the source of heat, as follows:

1. Gas welding

    Oxy acetylene or hydrogen welding (explained below)
    Air acetylene welding

2. Arc welding (explained below)
    Carbon arc welding
    Metal arc welding
    Gas metal arc welding (MIG)
    Plasma arc welding
    Electro slag welding (explained below)
    Submerged arc welding
    Flux cored arc welding
    Gas tungsten arc welding (TIG)
    Atomic hydrogen arc welding

3. Resistance welding (explained below)
    Butt welding
    Resistance butt welding
    Spot welding
    Seam welding
    Projection welding
    Percussion welding

4. Thermit welding (explained below)

5. Solid state welding


    Friction welding (explained below)
    Ultrasonic welding (explained below)
    Diffusion welding (explained below)
    Explosive welding (explained below)
    Cold welding (explained below)
    Forge welding

6. New welding processes

    Electron beam welding (explained below)
    Laser beam welding (explained below)

Related Processes

    Arc weld
    Hard pressing weld
    Oxy acetylene cutting
    Brazing
    Soldering

Some of the most important welding processes are explained below:

    Plastic welding or pressure welding:

In this process, the piece of metal to be joined is heated to a plastic state and then forced together by external pressure.

    Fusion welding or nonpressure welding:

In this type of welding method, the material at the joint is heated to a molten state and allowed to solidify. This include gas weld, arc weld etc.

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