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[MW:2422] learn pressure vessel welding

By Materials & Welding
Dear Sir,

I am eager to learn about welding processes dealing with pressure vessel.

1. What should I learn firstly, secondly,...so on ?
2. How could I get information ?
3. How long can I reach a comprehensive thinking to "know how" about the subject?

Please give me some helpfully advise...

Regards,

Refi

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