Page 111 - CITS - Welder - Trade Theory
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WELDER - CITS
Provide locked grooved joint allowance as shown in Fig 11.
Fig 11
Check the pattern once again and cut. Thus you get the pattern for branch pipe.For main pipe, develop and layout
the pattern as follows:
Draw the front view and end view. (Fig 12)
Fig 12
Extend the vertical lines 0, 1, 2, 3, 1, 0 of branch pipe from the front view as shown in Fig 13.
Fig 13
Extend The two extreme end vertical lines of the main pipe from the front view as shown in Fig 14.
Fig 14
On one of these lines, take point “0” as starting point and mark points 0, 1, 2, 3, 2, 1, 0, 1, 2, 3, 2, 1, 0 at equal
distances equal to one division of the semi-circle and draw horizontal lines from these points. (Fig 15)
Now these horizontal lines meet the vertical lines at their respective points as shown in Fig 16.
Join these points by free hand curve and get the pattern for the main pipe. (Fig 17)
Provide the locked grooved joint allowances as shown in Fig 17
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CITS : C G & M - Welder - Lesson 14-26 CITS : C G & M - Welder - Lesson 14-26
