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Welding-SQUARE BUTT JOINT

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Ex. No:                                                                            Date :

SQUARE BUTT JOINT

Aim

To join the given two work pieces as a ‘square butt joint’ by arc welding.

Material used

Mild steel plates.

Tools required

• Welding power supply 
.• Flat file
• Welding rod
• Chipping hammer
• Electrode holder
• Wire brush
• Gloves and apron 
• Earthing clamps
• Shield and goggles


Procedure

  1. 1. The given workpieces are thoroughly cleaned, i.e. rust, scales are removed and the edges are filed.
  2. 2. The electrode is held in an electrode holder and ground clamp is clamped to the welding plates and the power is supplied.
  3. 3. The workpieces are positioned on the table form a “square butt joint”.
  4. 4. The tag weld is done on the both the ends of joining plates to avoid the movement of workpieces during welding.
  5. 5. The welding is carried throughout the length of the workpieces on both sides by maintaining 3mm gap between plates and the welding rod.
  6. 6. The welded plates are allowed for air cooling after the slags are removed.
  7. 7. The weld joint portions are cleaned by wire brush.



Result



Thus the required square butt joint is made by arc welding process.



Questions

1. What is electrode and give its purpose?
2. What is consumable and non-consumable electrode?
3. What are the components of arc welding machine?
4. Define welding process.
5. Explain MIG and TIG?


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