This is a resistance spot welding circuit with a 5 second timer.

q1. What is the meaning of the the symbol I highlighted in the green rectangle?

q2. Should I expect continuity between the two points I highlighted in the red rectangle?

q3. How can I test independently the transformers T1 and T2 in this circuit?

q5. What is the meaning of TD1 in the circuit?

q6. What is the meaning of W in the circuit?

Spot Welder Circuit



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