Page 238 - CITS - Welder - Trade Practical

WELDER - CITS

• Set the V joint in a flat position.
• Deposit root run by using appropriate dia. Flux coared electrode 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.

Skill Sequence

Monitor square butt joint by flex cored arc welding (on

12mm thick plate)

Objectives: At the end of this exercise you shall be able to
• monitor square butt joint by flex cored arc welding (on 12mm thick plate)

- Prepare the sheets as per drawing using shearing and grinding.
- Use necessary safety precautions.
- Clean the edges of the sheet.
- Set the sheets as a square butt joint and tack weld at the end
- Fix the joint in on backing strip in flat position.

- Strike an arc and move the torch steadily.
- Use proper torch angles with slight weaving.
Note: Avoid side-to-side movement of the electrode.
- Deslag and clean the root bead thoroughly.

- Deposit the final covering run with and 160 amp current.
- Give side-to-side movement to the electrode not more than 2.5 times its dia.
- Use the same electrode angle as was used for the root bead.
Note: Prevent the upper edge of the plate from melting off by not allowing the arc to concentrate more
on the upper edge.
- Remove the slag with a chipping hammer.
- Clean the weld with a steel wire brush.
- Inspect the lap fillet weld and ensure.
- It has equal leg length with slight convexity

- The upper edge of the plate has not melted off
- It is free from surface defects.

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CITS : C G & M - Welder - Exercise 58(A)