Page 135 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 28: Arc gouging on MS plate 10mm thick (AG-01)

Objectives
At the end of this exercise you shall be able to
• select the electrode and set the current as per requirements
• start and maintain gouging action
• clean and inspect the gouging.

Job Sequence
• Mark and cut the pieces as per the given size.
• Mark and punch the straight line.
• Keep the plate in down hand position.

• Use 4mm dia electrode for 10mm thick plate and select DC electrode negative (DCEN).
• Set 300 amps current for both AC or DC machines and select DCEN if DC is used.
• Start from edge of the plate keeping a slant angle.
• When molten metal is established reduce the angle further to gouge and remove surface metal.

• While gouging is in progress remove molten metal and slag away from the arc and gouged groove.
• Move the electrode fast and control the gouging action.
• Complete the operation and clean the gouging surface.
• Inspect the groove for smoothness, even depth and uniformity.

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CITS : C G & M - Welder - Exercise 28