Page 57 - CITS - Welder - Trade Practical
P. 57
WELDER - CITS
EXERCISE 8: Fillet lap joint on MS plate 10mm thick in
horizontal position (SMAW)
Objectives
At the end of this exercise you shall be able to
• select electrode, current, polarity and arc length
• use distortion control and arc blow control methods
• weld the lap joint with a short arc and uniform travel speed
• inspect the weldments for external defects.
Job Sequence
• Prepare and clean the plates as per given dimensions.
• Set the Lap joint as per drawing and tack weld.
• Fix the joint in horizontal position.
• If DC machine is used, connect the electrode to the negative and use short arc to control arc blow.
• To avoid distortion due to contraction preset the plates such a way that the angle of the tack welded joint is
decreased to 87° on the Back side.
• Deposit the root run without weaving.
• Hold the electrode at the centre of the joint and start
• From leftward and use proper technique to avoid
40