Page 79 - CITS - Welder - Trade Practical

WELDER - CITS

Fig 1 Fig 2

Fillet - “T” joint on MS plate 10mm thick in overhead
position (SMAW)

Objectives: At the end of this exercise you shall be able to
• deposit root run on T fillet joint in overhead position
• control the molten pool when welding in OH position
• manipulate the electrode angle for a multi-run weld in OH position
• clean and inspect the weldment for surface defects.

Job Sequence

• Prepare and clean the job pieces.
• Set and tack the job pieces at both ends of the Tee joint in flat positions.
Note: Tack the work pieces in outside edges so as to avoid starting defect.
• Set the job in overhead position and adjust its height.

Note: Wear protective clothing i.e. helmet, hand sleeves, apron etc.
• Set a current of 110 amps for a 3.15mmø M.S. electrode.
• Connect the electrode holder in positive pole in the case of a DC machine.
• Deposit root run (first bead) deep in the root of the joint using a 3.15 mm ø electrode.
• Remove the slag and deposit second and third run with a 3.15 mm electrode. (Refer to Skill Information.)

• Remove the hot job by using a pair of tongs.
• Clean the weldments and inspect the surface defects.
• Repeat the exercise until you are able to weld the joint without defect.

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CITS : C G & M - Welder - Exercise 12