Page 303 - CITS - Welder - Trade Practical

WELDER - CITS

EXERCISE 79: 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
• prepare sheets by shearing and grinding
• set plates as lap joint
• operate the spot-welding machine
• complete the spot welding by applying pressure
• clean and inspect the weld.

Job Sequence

• Cut the plates by gas cutting as per drawing.

• Set the pieces in the form of corner joint as per drawing.
• Tack weld on both ends of the corner joint.
• Set the joint on the welding table in flat position .
• Connect the torch to the positive terminal of the machine.

• Set 90-100A current/corresponding wire feed rate,19 to 20 arc voltage and deposit the run using Dip transfer
mode.

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