Welding-LAP JOINT

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LAP JOINT

Aim

To join the given two work pieces as a lap joint by arc welding.

Material used

Mild Steel plates.

Tools required

1. Welding power supply 
2. Flat file
3. Welding rod
4. Chipping hammer
5. Electrode holder
6. Wire brush
7. Gloves and apron
8. Earthing clamps
9. Shield and goggles

Procedure

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

Result

Thus the required Lap joint is made by arc welding process.

Questions

1. What is the difference between arc welding and gas welding?

2. What is pressure welding?

3. What are the components of arc welding machine?

4. Name the different work holding mechanisms in a drilling machine.

5. How drilling is being carried out in lathe?