Sara $ Issa

بنزوى التقنية الكليةNizwa College of Technology

Mechanical Engineering Department

weldingDone by: Saravanan & Issa AL-Tobi

Sara $ Issa

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

Sara $ Issa

Definition of welding

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

Sara $ Issa

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

Sara $ Issa

Welding Processes and Materials

Sara $ Issa

Weld terminology

Sara $ Issa

Types of weld (joint)

Butt weld Fillet weld Corner weld Pipe weld Lap weld

Sara $ Issa

GAS WELDING

Sara $ Issa

Equipments for gas welding

Sara $ Issa

Cylinder and Cylinder Valve

Sara $ Issa

Regulator Setting

Sara $ Issa

Connecting Hoses

Sara $ Issa

Continues…

Sara $ Issa

Attaching The Weld Torch

Sara $ Issa

Attaching The Weld Torch( Continues)

Sara $ Issa

Opening The Gas Knob

Sara $ Issa

Igniting the Torch Using Striker

Sara $ Issa

Gas Flame

Sara $ Issa

Types Of Oxy-Acetylene Gas Flames

Sara $ Issa

Gas Flame Zones

Sara $ Issa

Gas Welding Equipments

Sara $ Issa

Gas Welding Torch

Sara $ Issa

Continues…

Sara $ Issa

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.

Sara $ Issa

Continues…

Sara $ Issa

Gas Cutter Tip

Sara $ Issa

ARC WELDING

Sara $ Issa

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

Sara $ Issa

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.

Sara $ Issa

Metal Arc Welding Procedure

Sara $ Issa

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)

Sara $ Issa

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

Sara $ Issa

THE END