Page 99 - CITS - Welder - Trade Practical

WELDER - CITS

Job Sequence

• Prepare the job pieces as per drawing.

• Clean the edges and surfaces of the metal pieces.
• Set the job pieces as lap joint.
• Select the nozzle No. 5 and C.C.M.S. filler rod 3mmø.
• Set a gas pressure of 0.15 kg/m2.
• Follow necessary safety precautions.

• Tack weld the sheets and check for alignment
• Weld the joint with a single run in horizontal position.
• Clean the welded area and inspect the weld for defects.

Skill Sequence

Lap joint on MS sheet 2.00mm in horizontal position (2F)

Objectives: At the end of this exercise you shall be able to
• prepare and weld lap joint on MS sheet 2.00mm in horizontal position.

• Position the cross bar of the positioner to the eye level.

• Adjust the pressure of oxygen and that of acetylene at 0.15 kg/cm2.
• Set and tack the job pieces in correct alignment with proper overlapping of pieces.
• Place the tack welds at correct locations.
• Fix the job on the cross bar of the positioner in horizontal position.

• Hold the blowpipe at 60 to 70° and the filler rod at 30 to 40° to the line of weld. Deposit the bead from the right
end of the joint by giving a circular motion to the blowpipe and proceed towards the left end.
• Maintain correct travel speed, manipulation of blowpipe and filler rod to produce uniform weld bead.

Clean the weldment and inspect for:
- Uniform weld size and shape of whole length (reinforcement and contour) of the joint.
- Equal leg length.
- No undercut at the toe of weld.
- Smooth ripple appearance.

- Proper crater filling.

Fillet weld ‘T’ joint on M.S sheet 3mm thick in

horizontal position by dip transfer 2F

Objectives: At the end of this exercise, you shall be able to
• prepare plate pieces to size as per drawing
• set and tack weld the plates in alignment as ‘T’ joint as per drawing
• set the ‘T’ joint in Horizontal position for welding
• deposit the bead with appropriate amount of filler metal
• clean and inspect for surface defects on the weld and bead appearance.

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CITS : C G & M - Welder - Exercise 17