TITLE : BASIC WELDING – GAS WELDINGGroup Member:

AIM :

Dzulkhairie Bin Dzulfadlie (06DEM15F1080) NUR HANANI BINTI MOHD RUSNI (06DEM15F1090) Janani A/P Selva Kumar (06DEM15F1087)

I. How to use 3 types of flame (carburizing, neutral, oxidising )

II. Welding of metal plates.MATERIAL : Metal plate, filler rod, oxygen and acetylene gas cylinder.APPARATUS: Thong, Gloves, Goggle, Wire Brush, Lighter, Leather Apron,

Chipping Hammer, spinder key to lock or unlock the cylinder valve, gas hose to channel the gas from the cylinder to the torch and pressure of regulator to adjust.

INTRODUCTION: As we know, gas welding use flame as source of heat. The flame is produced from the mixed of oxygen gas and acetylene gas. The flame melts the edges or surfaces of joining metal. This allow the molten metal to flow together and form a solid continuous joint upon calling.

PROCEDURE: 1. TURNING ON:

a. Acetylene slowly turned on (quarter/half turn of the needle valve) and ignited, producing a small flame. At this stage, a small amount of soot/smoke is given off the end of the flame.

b. Acetylene increased and oxygen turned on slowly.c. Acetylene increased slowly and oxygen more rapidly,

to produce an intense, localised flame, capable of precise welding.

d. The type of fire. Figure 82.

3. T-Joint :

a. Clean the metal plate where it will be joining with a wire brush.

b. Setup the acetylene cylinder and oxygen cylinder using spinder key.

c. Setup the regular to control pressure from the tanks to the required pressure to the hose.

d. Setup the torch to produce the flame starting from acetylene valve and than to the oxygen valve with ratio 1:1

e. Weld the metal with same properties rod to start joining method.

f. Weld the side to make it strong.

g. Then heat the metal with the filler rod to fill the empty space in between the metal.

4. Corner Joint :

a. Clean the metal plate where it will be joining with a

wire brush.b. Setup the acetylene cylinder and oxygen cylinder

using spinder key.c. Setup the regular to control pressure from the tanks

to the required pressure to the hose.d. Setup the torch to produce the flame starting from

acetylene valve and than to the oxygen valve with ratio 1:1

e. Weld the sides of the metal to make it strong.

f. Then heat the metal and the filler rod to fill the empty space between the metals.

Work Result

Discussion : 1. What is the function for the regulator? Set the gas Reduce the high pressure to the working

pressure2. State 3 types of flames?

Carburizing flame Neutral flame Oxidising flame

3. how much the ratio for neutral flame? 1:1

Conclusion : At the end of the experiment, we know that :1. How to weld with correctly.2. Three types of different flame.3. How to start or setup the regulator valves correctly.

Reference : 1. www.wikipedia.com 2. Encik. Hasrin Bin Hussin3. Encik. Mutiman Bin Mat4. Workshop