Page 99 - CITS - Welder - Trade Practical
P. 99

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
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