[MW:27336] Re: P-22 plate welding ...6-MM plate

Dear Sir.

On page 31 of the following document, you can find usefull information about prehgeat: https://www.comercialmuro.es/welding-and-post-weld-heat-treatment-of-p22.html

However, I also advise you to let the soldered surface cool down slowly, covering it with sandbags or with thermal blankets, for at least 12 hours.

Yours faitfully,

www.comercialmuro.es

El domingo, 11 de febrero de 2018, 11:12:01 (UTC), pradipsil escribió:

Dear Everybody,

We are doing  P-22 plate welding, thickness is 6 mm with E-9018B3 ( Dia 2.5 mm) electrode. Preheat is 150 to 200 degree centigrade with little beveling. Site is near the sea area.

We found lot of delayed crack  generally after 12 hours. Crack is coming middle of the weldment.

Can anybody inform me cause & corrective action for the same. 

Pic attached for your ready reference.

Thanks in advance.

Regards,

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