Droplet transmission with arc welding for engineering student.

1. Department of Mechanical Engineering.
IUBAT: International University of Busin
Agriculture and Technology

2. Topic:
Droplet Transmission With Arc
Welding

3. Group 06
Members:
Name ID
Md. Al Amin Hossain 15107105
Md. Shahin Rana 15107073
Md. Mostafijur Rahman 15107079
Abdullah All Mamun Dipu 15107037
Ruma Akter 14307029

4. Arc Welding
Arc welding is a process that is used to join metal
to metal by using electricity to create enough heat to
melt metal.

5. Arc Welding

6. Different Kinds of Arc Welding
1.Non shielded arc welding
 Electric arc welding
2.Shielded arc welding
 Gas metal arc welding
 Plasma arc welding
 Gas tungsten arc wielding

7. Characteristics of electrode
E6010
E6011
E6013
E7018

8. State of arc welding
1.Solid state
2.Liquid state

9. Droplet Transmission
 Droplet of arc welding means drop of the molten
metal at the time of arc welding
For molten metal droplets at the tip of the welding
wire, we account for effects of inertia, gravity, surface
tension, magnetic force, viscous drag force and arc
pressure.

11. Process of droplet

12. Process
There are two process:
1. Pulse Process.
2. Normal Process.

14. Droplet transmission of EAW
1.First should be touched
2.Making fusion
3.Again need to be touched

15. Plasma arc welding
Plasma arc welding is an arc welding process similar to gas tungsten
arc welding.
1.Gas plasma
2.Nozzle
protection
3.Shield Gas
4.Electrode
5.Nozzle
constriction
6.Electric arc

16. Process of plasma Arc
welding
Plasma arc welding processes can be
divided into two basic types:
1.Non-transferred arc process
2.Transferred arc process

17. Non-transferred arc process
The arc is formed between the electrode(-) and the
water cooled constricting nozzle(+). Arc plasma
comes out of the nozzle as a flame. The arc is
independent of the work piece and the work piece
does not form a part of the electrical circuit.
Transferred arc process
The arc is formed between the electrode(-) and the
work piece(+). In other words, arc is transferred
from the electrode to the work piece. A transferred
arc possesses high energy density and plasma jet
velocity.

18. Gas Metal Arc Welding
Metal inert gas (MIG) arc welding also known as Gas metal arc
welding (GMAW), is a welding process in which an electric arc forms
between a consumable wire electrode and the work piece, which heats
the work piece, causing them to melt and join.
Power 2 kW

19. Working Process of GMAW
We can Differentiate this process into five steps:
1. Electrode
2. Arc
3. Weld Puddle
4. Shielding Gas
5. Solidified Weld Metal

20. Metal Transformation
Metal can be transferred by three methods in GMAW process:
 Spray Transfer:
1. Rate of droplets is 100 per second
2. Transfer is spatter free and very stable
3. High DC current and voltage are used
 Globular Transfer:
1. Carbon-dioxide-rich gases are utilized
2. Globules propelled by the force
3. High welding currents are used
 Short – Circuiting:
1. Metal is transferred in individual droplets
2. More than 50 per seconds
3. Low currents and voltages are utilized
4. Power is required about 2 KW

21. Metal Transformation

22.  GMAW is applied to steels because it provided faster welding
time compared to other welding processes.
 GMAW is the most common industrial welding process,
preferred for its versatility, speed and the relative ease of adapting
the process to robotic automation.
Advantages of GMAW