Page 189 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

Fillet weld outside corner joint on aluminium sheet 2mm

- thick in postion flat (1F)

Objectives : At the end of this exercise you shall be able to
• weld outside corner joint in aluminium sheet 2 mm thickness using TIG welding process.

Job Sequence

1 Use pure aluminium filler wire/alluminium +5% silicon of 2.4mmj.
2 Use 2.4jmm (Zirconium) tungsten electrode.

3 AC power source with DC suppressor and high frequency units.
4 Shielding gas argon.
5 Prepare aluminium sheet as per dimensions.
6 Clean the edges of the sheets.

7 Use stainless steel wire brush for surface cleaning.
8 Tack the set pieces at correct intervals and in correct alignment for an outside corner joint (Fig 1).
9 Weld the joint in flat position.
10 Make uniform size bead with correct penetration at the root in the outside corner joint.
11 Clean the weld area thoroughly.
12 Inspect the completed outside corner weld for weldment quality.

Fig 1

Fig 2

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CITS : C G & M - Fitter - Exercise 52