Page 143 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 31 : Silver brazing on S.S. sheet with copper
sheet ‘T’ joint

Objectives

At the end of this exercise you shall be able to
• prepare plate pieces to size as per drawing
• set and tack joint the plates in alignment as ‘T’ joint as per drawing
• set the ‘T’ joint in flat position for brazing
• deposit the bead with appropriate amount of filler metal
• clean and inspect for surface defects on the bead appearance.

Job Sequence

1 Prepare the sheets (S.S. and copper) by using shearing, grinding & filing.
2 Clean the base metal by steel wire brush.
3 Set the sheets as ‘T’ joint on welding table
4 Wear all protective clothings.
5 Open the Cylinder values (Both O2 and C2H2) slowly and let the working pressure.
6 Select nozzle one or two size bigger size than the sheet thickness.
7 Select 1.6mm ø filler rod with 40 to 50% silver and 25- 15% zinc remaining copper.

8 Ignite the flame by spark lighter.
9 Set slightly oxidising flame.
10 Tack the job as per the fig shown below. (Fig 1)

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CITS : C G & M - Welder - Exercise 31