Page 288 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 73: Construct Lap joint on MS sheet 1.6 mm in
Vertical position by GTAW

Objectives

At the end of this exercise you shall be able to
• produce molten pool of required size by the manipulation of torch
• 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

- Cut the plate by using hacksaw cutting as per drawing
- Construct Lap joint on MS sheet 1.6 mm in Vertical position by GTAW
- Fill the crater

- Manipulate the torch and filler rod in the correct position with respect job
- Stop the weld at the left-hand edge of the joint after filling up in the crater at the end of the weld
- The angular distortion between the vertical and horizontal sheets of the lap is automatically controlled
- The current set is 10 to 15 amperes
- At the end of the welding perform the carter filler treatment by repeating the torch switch ON-OFF

- Cut the arc and hold at the finishing point unit molten metal solidifies

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CITS : C G & M - Welder - Exercise 72