Page 261 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 63: Assess the Square butt joint on MS in

down hand position by GTAW.

Objectives

At the end of this exercise you shall be able to
• select and set electrode size, filler rod, current, gas flow rate and polarity
• weld the joint using proper manipulation and angles for the torch and filler rod
• weld the joint without, weld defects.

Job Sequence

• Cut the plate by using hacksaw cutting as per drawing
• Set the sheets and tack weld in the form of a “Square butt” joint on the welding in flat position

• 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 Tee joint is automatically controlled
• The current set is 10 to 15 ampere

• 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
• Visual inspection: slight convexity ,uniform width ,uniform ripples And free from under cut at the toes of the
weld indicate a smooth
Note : Wear protective clothing.

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