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What conditions are required for welding when making holes under pressure using 3° water and -15° water?

2017-05-17View Original

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I’m using 3° water and -15° water pipelines, and I want to perform pressure-opening after welding short sections onto them. Due to the low temperature of the pipelines, I’m concerned that the welds might crack (as these are main pipelines). Is there any way to prevent cracking?

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