Page 219 - CITS - Welder - Trade Practical

WELDER - CITS

Job Sequence

- Cut the sheet by shearing machine as per drawing.
- Grind and file the edges of sheets to square.
- Deburr and clean the surface of the plates by carbon steel wire brush and filling.
- Set the plate A on the plate B In the form of lap as per drawing.

- Wear protective clothes.
- Connect the torch to the positive terminal of the machine.
Electrode:
- Select dia 0.8.mm M.S. electrode - Set 70 to 90 amps current
- Ensure proper root penetration and even fusion of plate A and B with suitable welding gun / torch angle and
Arc travel speed
Note: Wear protective clothing.

• Tack-weld on both ends.
• Set the lap joint in a flat position.

• Deposit root run with 100-110 amps current.
Note: Ensure an electrode angle of 45° with the fillet corner and 80° with the welding line.

- Check the all connections before welding
- Welding area should be dry area
- Use welding screen and chipping goggle for eyes and face safety

Note: Prevent the upper edge of the plate from melting off.
• Remove the slag from the final weld and clean thoroughly.

Note: Use a weld gauge to check the fillet size.
• Inspect the lap fillet weld for surface defects and size.

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CITS : C G & M - Welder - Exercise 54(A)