Page 297 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 76: Plan & perform Root pass welding of M. S
schedule 40pipes by GTA Welding up to 6G

Positions

Objectives

At the end of this exercise you shall be able to
• mark and set the plate as per drawing
• select filler wire and set the gas flow and current
• deposit the bead with or without weaving
• clean and inspect the weld.

Job Sequence

- Cut and prepare the aluminium pipe as per the dimensions given.
- Align the pipes in flat position (butt) for tack weld with the help of a Vee Block-angle iron.
- Tack the joints at 120°C by rotation and complete the tacking.
- Use the roller stand to maintain the downward welding position

- Rotate the pipe at uniform speed for good weld result.
- Further welding is done by rotating the pipe as shown in to the next segment and completed.
- Repeat the above procedure till the joint is completely welded.
- Remove the work piece from the rotating fixture.

- Clean the weld bead and inspect
Note: Wear protective clothing.

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