Page 147 - CITS - Welder - Trade Practical

WELDER - CITS

Insert the other tube into the bell mouth and tack it at 3 points. (Fig 5)

Keep the tack welded pipe assembly vertically and heat it until the colour of the tube starts changing.
Make a thin run on the line formed by the outer circumference at the bottom end of the tube and the inner
circumference at the bottom of the bell mouth of copper tube (i.e tip of the bell mouth).
Make the first deposit starting from the tack weld 1 and ending at the midpoint of the tack welds 2 and 3 covering
half the circumference of the bell mouth. (Fig 6)

Fig 5 Fig 6

Clean the deposit.
Fig 7
Make the second deposit starting from the
commencement point of deposit 1 and ending at the
finishing point of the deposit 1 which will cover the
remaining half circumference of the bell mouth.
Ensure the deposit 2 merges with the deposit 1 at both
ends (i.e. terminal points) properly by withdrawing
the filler rod and manipulating the flame over these
merging points. (Fig 6)
Ensure that the weld deposit is of the correct profile
and it completely covers and bonds (without over
spilling the outer edge of the bell contour. (Fig 7)

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CITS : C G & M - Welder - Exercise 32 CITS : C G & M - Welder - Exercise 32