Page 232 - CITS - Welder - Trade Practical

WELDER - CITS

Job Sequence

- Cut the sheets by power shearing machine as per drawing.
- Grind and file the edges of sheets to square.

- Use plain goggles while grinding
- Deburr and clean the surface of the sheets by carbon steel wire brush and filling.
- Set the sheet B on the sheet A in the form of Tee as per drawing
- Tack weld (min.10 mm length) on both ends of theT eejoint
- Set the sheet Cas Lap joint as per drawing Fig 1 on the 50mm wide sheet A.

Fig 1

- Tack weld (keeping minimum length of 10mm) on both sides of the lap joint

- Ensure proper leg length and even fusion of sheets A and Bwith suitable welding gun/torch angle and arc travel
speed.
- Clean the welded joint by wire brush.

- Deposit the bead on the lap joint (joint II) with the same parameters and technique used for theTee joint.
- Ensure good penetration and even fusion of sheets A and C with suitable torch angle and arc travel.
- Avoid under cut on sheet C
- Ensure the edge of the sheet A (at the toe of the weld) is not melted off due to excessive weaving.

- Ensure there is noundercutattheothertoeofthelapweldonsheetC.
- Clean the bead and the lap joint with wire brush
- Inspect the welded joint for undercut, uneven bead,edgeoftheplatemeltedoff,distortion and good bead profile.
Note : Wear protective clothing.
• Tack-weld on both ends.
• Set the lap joint in a flat position.

• Deposit root run by using a 3.15mm dia. Medium coated M.S. electrode with 100-110 amps current.
Note : Ensure an electrode angle of 45° with the fillet corner and 80° with the welding line.
• Remove the slag with a chipping hammer and clean with a wire brush.
• Use tongs to hold the job.

• Wear chipping goggle for the protection of eyes.
• Deposit the final covering run with a weave motion using a 4.00 mm dia. Medium coated M.S. electrode
with150-160amps welding current.

Note : Prevent the upper edge of the plate from melting off.
• Remove the slag from the final weld and clean thoroughly.
Note : Use a weld gauge to check the fillet size.
• Inspect the lap fillet weld for surface defects and size.

215
CITS : C G & M - Welder - Exercise 56