Page 304 - CITS - Welder - Trade Practical

WELDER - CITS

• Deposit run in the joint by forming a key hole and obtain complete penetration and even fusion of plates.
• Ensure good leg length and even fusion of plates.
• Select dia 1.mm m.s electrode
• Set 90 to 100 amps current

• Ensure proper root penetration and even fusion.
• Wide and weaving motion the side of corner joints.
Note: Wear protective clothing.

Skill Sequence

Make Lap joint on Stainless steel sheet by Resistance Spot
welding MS sheets joining by Resistance Spot welding

Objectives: At the end of this exercise you shall be able to
• make lap joint on stainless steel sheet by resistance spot welding ms sheets joining by resistance spot
welding.

1 Set the pieces in the form of lap joint.

2 Select proper spot welding machine as Fig 1.
3 Select centre tip type copper electrodes.
4 Set current flow time, contact period time.

5 Check the water cooling system.
6 Tack at both ends of job by applying the pressure with spot welding machine.

Fig 1

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CITS : CG & M - Welder - Exercise 79