Page 267 - CITS - Welder - Trade Practical

WELDER - CITS

• Clean the weld area thoroughly.
• Inspect the job for free defects.
• Visual inspection : slight convexity, uniform width, uniform ripples And free from under cut at the toes of
the weld indicate a smooth

Skill Sequence

Monitor Square butt joint on Aluminum sheet 3 mm thick
in Flat position by GTAW

Objectives: At the end of this exercise you shall be able to
• monitor Square butt joint on Aluminum sheet 3 mm thick in Flat position by GTAW.

Setting and tacking the lap joint
Ensure setting of Butt joint as per drawing.
Tungsten electrode tip to be ground for AC welding-Aluminium.

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.
F - Flat, H - Horizontal, V - Vertical, O - Overhead
Maintain uniform short arc throughtout the welding.

Care to be taken to avoid end crater.
During welding a temporary backing is to be given on the underside to support the penetration bead.

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CITS : C G & M - Welder - Exercise 66