Page 186 - CITS - Welder - Trade Practical

WELDER - CITS

– Complete the weld with the second run. Adjust the speed of rotation to secure fusion to the outer edge of each
fusion face. The amount of reinforcement should be even around the edge of the joint. 1b Welding of a pipe
butt (IG position i.e. by rotation) by segmental welding.

– The edges of the pipe are beveled to 35 to 40° angle with a root gap of 2.5 mm.
– Tack the pipe as before and support the assembly on two ‘V’ blocks.
– Strike the arc at 10° from Top Dead Centre (TDC) and deposit the root run. Use a small weaving motion to
achieve fusion of the root faces. Adjust travel speed to control root penetration.
– Move the pipe until the end of the segment is at 10° before TDC.
– Strike the arc on the end of the previous weld run and establish a weld pool.
– Weld a further 60° segment.

– Continue welding in segments until the root run has been completed.
– Move the pipe until the mid point of the segments is at TDC.
– Strike the arc and deposit the second (filling) run, use a side-to-side weaving position to fill the preparation and
to achieve fusion of the pipe edges.

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CITS : C G & M - Welder - Exercise 46