Page 140 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 30 : Hard facing practice on MS round rod
25mm - by using hard facing

Objectives

At the end of this exercise you shall be able to
• prepare the surface to be hardened
• do the marking and setting
• select the electrode and set the current and polarity
• deposit beads using the sequence method
• give the after treatment
• give the aftertreatment defects.

Job Sequence
1 Clean the surface of the job.
2 Divide the M.S. round circumference into four points.

3 Draw and punch the lines from the four points.
4 Place the punched M.S. round bar horizontally on the Vee blocks at both ends.
5 Select a 3.15mm hard facing electrode and set 90-120 amps current.

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CITS : C G & M - Welder - Exercise 29