Page 249 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 60 : Monitor & assess tee joints on MS pipe

60 mm od x 3 mm wt in flat position - arc
constant (rolling) by GMAW

Objectives

At the end of this exercise you shall be able to
• prepare the edges and set the pipe in alignment
• tack-weld and deposit root pass
• depositetherootandsecondrunsofweldbeads
• inspect the completed pipe weld.

Job Sequence

- Cut the pipes to the given size
- Branch pipes in mild steel may be cut on a special oxy-fuel gas profiling machine. Where such equipment is
not available, the branch can be produced by marking the outline

- Scriber or pointed chalk followed by centre punching.The branch can then be produced by cutting to the
marked out line, using manually operated oxy-fuel gas cutting equipment
- Oxy-fuel gas profiling machines,whichcut the hole and produce the required angle for weld preparation
- Cutting manually using the oxy-fuel gas process,the cut edge being dressed smooth by using a hand grinder
or file. With this method,care must be taken to ensure that the cut sections are removed from inside the pipe
- After cutting to length, remove any burrs on the inside of the pipe by reaming or filing.
- Ensure the correct size of pipes.

- Prepare development for 90°Tee

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