Page 269 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 67: Assess Corner joint on Aluminum sheet
2 mm thick in down hand position by GTAW

Objectives

At the end of this exercise you shall be able to
• weld outside corner joint in aluminum sheet 2 mm thickness using TIG welding process
• add filler metal at the required rate and place by manipulation the filler rod
• deposit fusion run with filler rod in flat position and maintain uniform arc travel speed
• clean and inspect the deposited beads for surface defects.

Job Sequence

• Use pure aluminium filler wire/alluminium +5% silicon of 2.4mm.
• Use 2.4mm (Zirconium) tungsten electrode.
• AC power source with DC suppressor and high frequency units.
• Shielding gas argon.

• Prepare aluminium sheet as per dimensions.
• Clean the edges of the sheets.
• Use stainless steel wire brush for surface cleaning.

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