Sara $ Issa الكلية التقنية بنزوى Nizwa College of Technology Mechanical...

Sara $ Issa

بنزوى التقنية الكليةNizwa College of Technology

Mechanical Engineering Department

weldingDone by: Saravanan & Issa AL-Tobi

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Before starting actual arc welding the student should be fully aware of the dangers involved. The high temperature arc, hot metal and ultra violet radiations which can cause severe eye irritation and burns.

So students should follow the safety rules very strictly.

Welding safety

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Definition of welding

• “joining of metals by application of heat and/or pressure, with or without the addition of filler metals”

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Types of Welding Gas welding Arc welding Resistance welding Tungsten inert gas welding Metal inert gas welding Projection welding Submerged arc welding Electro slag welding

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Welding Processes and Materials

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Weld terminology

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Types of weld (joint)

Butt weld Fillet weld Corner weld Pipe weld Lap weld

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GAS WELDING

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Equipments for gas welding

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Cylinder and Cylinder Valve

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Regulator Setting

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Connecting Hoses

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Continues…

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Attaching The Weld Torch

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Attaching The Weld Torch( Continues)

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Opening The Gas Knob

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Igniting the Torch Using Striker

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Gas Flame

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Types Of Oxy-Acetylene Gas Flames

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Gas Flame Zones

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Gas Welding Equipments

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Gas Welding Torch

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Continues…

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Gas cutting By changing the weld torch with a gas cutting

torch same set up can be used for cutting thick metal plates as shown below.

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Continues…

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Gas Cutter Tip

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ARC WELDING

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Arc Welding This is the welding process where required

heat is obtained from the electric arc produced between the electrode and the work piece metal.

Types– Manual metal arc welding(stick welding)– TIG welding– MIG welding– SAW welding

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Equipments of Arc Welding Creates a thick weld, using a metal rod covered

with flux which is called consumable electrode. AC/DC Transformer is the important equipment Electrode holder, wire brush, chip hammer.

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Metal Arc Welding Procedure

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Electrodes

There are two types of electrode

Consumable electrode (electrode melt and becomes part of the weld) Non-consumable electrode (electrode does not melt and creates only the arc)

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Comparison

Arc welding Gas welding

-Heat is more -Electrical power is the source of energy-We use flux coated electrodes-Suitable for welding steel

-Heat is less-Chemical reaction between gases is the source of energy-We use filler rods-Suitable for welding copper and brass

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THE END