Page 230 - CITS - Welder - Trade Theory

WELDER - CITS

a Ammeter, Voltmeter and a remote control for each of the Power Source.
b A speed control for each wire drive motors.
c Alarm Systems for equipment mall functions.
5 Travel carriage

All functions of the machine are controlled from a Panel located at the vertical transport carriage assembly.
6 Water cooled copper shoes
The Copper Shoes accelerate solidification of the weld metal. The functions of the Copper Shoes are to maintain
the molten metal and molten slag until it solidifies
Electro gas welding
Electro Gas Welding is an automatic welding Process that uses a Carbon Di-oxide (CO2) or a mixture of CO2 and
Argon Shielding Gas to protect the Arc and molten weld metal from Atmospheric Contaminants. A Consumable
Flux cored or Solid electrode wire is continuously and mechanically led into the arc and molten pool. Edge
Preparation is not necessary. This process may be carried out by two methods

1 Solid Electrode Process
2 Flux Cored Electrode Process
Solid electrode process
In this Process, generally single electrode is fed into the joint. Two electrodes can be used for welding of thick
plates. The Shield is done by the CO2 gas and no extra flux is required.
Flux cored electrode process
In this Process, electrode with flux is fed into the joint and a thin layer of Slag on the top of molten pool. The
Shielding is done by Flux.
Electro gas welding equipment and supplies
The Equipment’s of Electro Gas Welding are similar to Electro Slag Welding but the difference is Shielding Gas.
1 AC power source

2 Water cooled copper shoes
3 Welding gun
4 Wire feeder
5 Shielding gas and
6 Control panel
Applications

It is used for welding of thick plates in vertical position. It can be applied on Carbon Steel and Alloy Steels.
Advantages
1 Welder can see the welding pool easily.
2 Restarting the weld is easier.

Disadvantages
It is not suitable economical for welding metal lesser than 25 mm. thick.

217

CITS : C G & M - Welder - Lesson 77 - 82