Page 222 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 54(B) : Demonstrate fabrication of tee joint on
M.S. plate (sheet 6 mm. thick plate)
in vertical downward progression by

GMAW

Objectives

At the end of this exercise you shall be able to
• prepare the plates and tack weld them as inverted ‘T’ joint.
• set the tack welded joint in the weld positioner in vertical position.
• deposit the root run by slight weave bead technique from bottom to top.
• deposit the 2ndrun by weaving technique to obtain necessary leg length and throat thickness.
• ensure to avoid too much sagging of weld metal by adopting proper weaving and weave-pause technique.
• ensure proper cleaning of the plate surfaces and inter bead cleaning.

Job Sequence

- Cut the sheet by shearing machine as per drawing.
- Grind and file the edges of sheet to square.
- Deburr and clean the surface of the plates by carbon steel wire brush and filing.
- Wear protective clothing.

- Connect the torch to positive terminal of the machine.
- Select dia 0.8.mm ms electrode

205

CITS : C G & M - Welder - Exercise 54(A)