Page 186 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS
Butt weld square butt joint on aluminium sheet 2mm -

position flat

Objectives : At the end of this exercise you shall be able to
• weld square butt joint on Aluminium sheet 3mm thick using TIG welding process.
Job Sequence

1 Prepare aluminium sheets as per dimensions.
2 Use Tungsten (zirconium) 2.4mm dia electrode.
3 Clean the edges of the sheets.
4 Use the stainless steel wire brush for surface cleaning.
5 Set the square butt joint.
6 Select the various parameters as given in the Table 1 and set them accordingly.
7 Weld the joint in flat position using leftward technique.
8 Fill the crater.
9 Clean the weld area thoroughly.
10 Inspect the job for free from defects.

Skill Sequence

Ensure setting of Butt joint as per drawing.
Tungsten electrode tip to be ground for AC welding-Aluminium as shown in Fig 1.
Tack weld at equal intervals-keeping the uniform root gap of 1.5mm between the samples along the welding length.
Adjust the current as per guide line given in Table 1.

Fig 1

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CITS : C G & M - Fitter - Exercise 52