Page 31 - CITS - Welder - Trade Practical

WELDER - CITS

Job Sequence

• Wear safety apparel.

• Clean the surface to be cut.
• Set the gas welding plant and fix the cutting blowpipe.
Note: Ensure the cutting nozzle is according to the thickness of the metal.
• Adjust the gas pressure of acetylene and the cutting oxygen.
Note: Ensure the pressure setting as per the metal thickness and size of the cutting nozzle.
• Mark and punch the plate at the required bevel angle.

• Adjust a proper cutting flame.
• Hold the cutting blowpipe at the proper bevel angle to be cut.
• Heat at one end of the plate on the punch line up to cherry red hot.
• Release the cutting oxygen, and observe the cutting action.

• Move the cutting blowpipe towards the other end, following the punched line slowly and steadily at the required
angle.
Note: Maintain a correct speed and distance of the nozzle.

• Close the cutting oxygen and extinguish the flame on the completion of the cut.
• Clean the cut, and inspect for its accuracy.
• Repeat the exercise till you achieve a good and smooth cut.

Skill Sequence

Bevel cutting by hand (Oxy-acetylene)

Objectives: At the end of this exercise, you shall be able to
• set the work piece for bevel cutting
• gas cut bevel surfaces by hand
• inspect the bevel cut.

Setting the job (Fig 1)
Set the job on a rigid table.
Note: Ensure the underside of the cut line is clear.
Adjustment of the cutting flame.
Select a cutting nozzle as per the length of the bevel. (Fig 2)

Fig 1 Fig 2

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CITS : C G & M - Welder - Exercise 04