Page 281 - CITS - Welder - Trade Practical

WELDER - CITS

Skill Sequence

Square butt joint on S.S sheet 1.6mm thick

in Flat position by GTAW

Objectives: At the end of this exercise you shall be able to
• square butt joint on S.S sheet 1.6 mm thick in Flat position by GTAW.

Select a Tungsten electrode of a proper f and give a proper angle to its tip 600 normally.

Set the torch (Figs 1,2,3& 4) with proper electrode extension.
Set the water line. Connect the gas and water hoses of the torch to the gas and water lines properly and check
for water and gas leakage. Connect the power lead of the torch to the negative terminal of the power source and
workpiece of the positive terminal of the power source. Check the connections for tightness.
The electrode should be ground to have the tip with proper angles. Blunt tipped electrodes must be ground as
shown in Fig. A properly ground electrode tip provides confined and stable arc which gives better penetration
during welding. Special grinding machines are available to grind the tungsten electrodes.

Fig 1 Fig 2

Fig 3 Fig 4

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CITS : C G & M - Welder - Exercise 70