Page 179 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

• Select a C.C.M.S. filler rod Æ1.5mm for tacking and Æ3.00mm for welding.
• Wear safety apparel.
• Set the neutral flame.
• Tack the pieces at both the ends and also in the centre using a Æ 1.5mm filler rod. (Keep a shrinkage
allowance of 2)
Tacks should be well fused and penetrated.
• Check the alignment and gap between the pieces, and reset, if necessary.
• Clean the tacks and reset the job on the welding table in a flat position.

• Start welding, using the leftward technique with the correct angle of the blowpipe and filler rods of Æ3mm.
• Fuse the edges uniformly and add filler metal. (maintain a correct travel speed and motion of the blowpipe and
filler rod, to produce a uniform weld bead)

• Stop at the left edge, fill the crater to complete the weld.
• Extinguish the flame, cool the nozzle and place the blowpipe at a safe place.
Clean the welded joint and visually inspect for
- a slight convex uniform width and height of bead.

- a slight penetrating bead on the reverse side of the ripples joint near the root.
• Repeat the exercise till you get good results.

TASK 4 : Fillet weld ‘T’ joint in flat position by gas welding
• Prepare job pieces as per drawing.

• Clean the surface and edges of the sheets to be welded.
• Set the sheets in the form of a ‘Tee’ joint on the gas welding table.
• Wear safety apparels and gas welding goggles.
• Set the gas welding plant, fix nozzle No.5 and set pressure at 0.15 kgf/cm2 for both the gases.
• Set the neutral flame, tack at both ends of the joint and also in the centre with a 1.6 mm C.C.M.S rod.

• Check the alignment of the joint with a try square and clean the tacked portion.
• Keep the job on the welding table in a flat position.
• Start welding with the leftward technique and melt the right hand end of the joint.
• Fuse the area to be welded (i.e. equally the part of the horizontal sheet and the vertical sheet) and apply the
filler rod in the molten pool to form a fillet weld at the joint.
• Maintain correct travel speed, manipulate the blowpipe and filler rod to produce a uniform weld bead.
• Stop the weld at the left hand end of the joint after filling up the crater at the end of the weld.

• Extinguish the flame, cool the nozzle and place the blowpipe at its place.
• Clean the weldment and inspect for defects in the fillet weld.
Visual inspection
• Slight convexity, uniform width, uniform ripples indicate a good weld bead. A weld without undercut,
overlap,porosity, etc. will ensure a good quality weld.
• Weld on the other side of the joint for more practice

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CITS : C G & M - Fitter - Exercise 51