How to do Gas Welding | Butt Joint | Gas Welding Procedure | NEC Mech | Engineering Practices Lab

This video will give you information about the procedure of making BUTT Joint using Gas Welding
Thanks to Mr. Balasubramani, Welder, National Engineering College, Kovilpatti, Tamilnadu
College website: www.nec.edu.in
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Gas Welding Procedure:
1. The surface to be welded is cleaned.
2. Open the acetylene and oxygen cylinder valve slowly, then open the acetylene valve in the torch. Keep the tip of the torch away from body and light it using lighter.
Open oxygen and acetylene valves in torch slowly to get the required flame for welding.
3. Maintain a gap of 3 mm between the plate to be welded and the inner core of the flame.
The torch and filler rod is moved backwards along the line to be welded.
TOOLS AND SAFETY EQUIPMENTS IN WELDING
Goggles
Goggles with glasses are used to protect the eyes of the welder from the light sparks produced during welding.
Face Shield
A face shield is also used to protect the eyes of the welder from the light sparks produced during welding. It is normally held in hand.
Chipping Hammer
A chipping hammer is used to remove Slags which form during welding.
Ground Clamp
It is connected to the end of the ground cable. It is normally clamped to the welding table or the job itself to complete the electric circuit
Wire Brush
The wire brush is used to clean the surface to be welded.
Aim:
To join the given two work pieces as a butt joint by gas welding.
Tools required
• Welding torch
• Filling rod
• Wire brush
• Gloves and apron
• Goggles
Procedure:
1. First of all, the work pieces must be thoroughly cleaned to remove rust, scale and other foreign materials.
2. Then the given work pieces are placed on the table in such a way that one work piece is placed near the other work piece like the Butt joint is formed.
3. Appropriate power supply should be given to the electrode and the work pieces.
4. The output flame may be adjusted by varying the valve.
5. When current is passed, gas is produced between the work pieces.
6. Then the welding is carried out throughout the length.
7. As soon as the welding process is finished, switch off the current supply and allow the work piece to cool.
9. Finally using wire brush, welded portions are cleaned.

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