Fabrication ProcessJoining two or more elements to make

a single part is termed as fabrication process.

Fairly large numbers of industrial components are made by fabrication process .

Examples: Aircraft ,Shipbuilding, Bridges, Sheet metal parts etc.

Classification Of Fabrication Process

Mechanical joining by means of bolts, screws and rivets.

Welding, Brazing and Soldering.

Welding is a joining process that uses heat, pressure, and/or chemicals to fuse two materials together permanently. Welding covers a temp range of 1500º F - 3000º F (800ºC - 1635ºC).

Types Of Welding

Plastic Welding The pieces are heated to a plastic state and

then forced together by external pressure.

Fusion Welding

Gas welding ( oxy acetylene, air –acetylene ,oxy -hydrogen)

Resistance welding (Butt, Projection, percussion ,spot , seam)

Thermit weldingSolid state welding ( friction, diffusion ,

ultrasonic, explosive)Advance welding (electro beam ,laser beam)

Classification of ARC

WeLding

WELDING

ARC WELDING

Carbon arc weldingMetal arc weldingGas metal arc welding(MIG)Gas tungsten welding (TIG)Submerged arc weldingPlasma arc weldingElectro slag welding

WELDING PARAMETERS

Carbon Arc WeldingIn carbon arc welding heat is produced with an arc between a carbon electrode and work, normally no shielding gas is used.

Carbon arc welding process can be used as an all position welding process.

Carbon Arc Welding

MIG WeldingIn mig welding process a consumable wire of 0.8 to 2.4 mm dia is wounded in spool form is feed at a preset speed through a welding torch where it is provided the electrical connection and the shelding gas.

MIG WELDING

TIG WELDINGTig welding is a process in which the source of heat is an arc formed between a non consumable tungsten electrode and the work piece, shielding gas argon is supplied continuously during welding

TIG WELDING

TIG WELDING

Submerged Arc WeldingSubmerged arc welding is the process in which continuous copper coated spooled wire is used with loose granulated powder ahead of the arc , so to protect the molten pool from atmospheric gases.

Submerged Arc Welding

Carbon-Electrodes

Welding Troch & Cable

TIG Welding Machine

TIG Welding Torch

Tungsten Electrodes

Gas Regulator

TIG WELDING

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