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a numerical problem on arc welding

In a particular arc welding operation 5 mm thick steel plate requires 40 A current , what should be the current requirement for welding 10 mm thickness plates?
a) 10 A
b) 20 A
c) 60 A
d) 160 A

pls answer this question and post a suitable relationship for that answer?
i am getting 80 A answer which is not in option.

pls try and answer.
In a particular arc welding operation 5 mm thick steel plate requires 40 A current , what should be the current requirement for welding 10 mm thickness plates?
a) 10 A
b) 20 A
c) 60 A
d) 160 A

pls answer this question and post a suitable relationship for that answer?
i am getting 80 A answer which is not in option.

pls try and answer.
Q.which type of welding technique is suitable for gray cast iron and why ?

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