Page 206 - CITS - Fitter Trade Pactical - Volume - 2

FITTER - CITS

If the speed of travel and the blowpipe motion are correct, the FUSION RUNS will appear in uniform
width and even ripples.
• Repeat the exercise till you achieve uniform FUSION.

TASK 3 : Fusion run with filler rod in flat position by gas

• Check the size of the raw material.
• Mark and file to size.
• Mark the bead position as per drawing.
• Set the workpiece on the welding table with the left edge raised about 15mm.

• Select the nozzles size 5 (IOL make-saffire type) and set the acetylene/oxygen pressure at 0-15 kg/cm2.
• Select a mild steel copper coated (C.C.M.S) filler rod of Ø1.6mm.
• Wear safety apparel and set a neutral flame.
• Hold the blowpipe at an angle of 60° - 70° on a punched line of sheet and make a small molten pool at the
right hand edge.
Keep a flame cone distance of 2.0 to 3.0mm from the job surface.
• Hold the filler rod in the left hand, pointing near the molten pool with an angle of 30°- 40° with the line of weld.

• Dip the end of the filler rod into the molten pool and add the filler metal on the job surface to form a weld bead.
• Move towards the left with a uniform speed along the punched line with a slight circular motion of the blowpipe
and piston-like motion of the filler rod.

Add enough rod into the molten pool to build up the bead evenly in height and width.
Coordinate the rate of travel with the filler rod to control the size of the bead and the required
penetration.

• Stop at the left edge, extinguish the flame and cool the nozzle.
• Clean the weld surface. Inspect for even ripples and uniform width/height of the weld bead.
• Repeat the exercise till you get good results.

Skill Sequence

Ignite,setup and extinguish oxy-acetylene flame for gas

welding (TASK 1)

Objectives: At the end of this exercise you shall be able to:

• ignite, set and extinguish an oxy-acetylene flame for gas welding correctly
• shut the oxy-acetylene plant for stopping work.

Flame lighting
The safety apron, gloves and goggles are worn as shown in (Fig 1).
Set the pressure of oxygen and acetylene at 0.2kgf/cm2 for a small size nozzle. (No.3)
While setting the pressure on the regulator, keep the blowpipe control valve open for accurate
setting.

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CITS : C G & M - Fitter - Exercise 54