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hi, the same happen but with different scenario, 1.25 Cr (P11) 38mm heat exchanger tube sheet has overlay with 347Si electrode ,after PWHT tube 321 ST.ST welded to tube sheet ) tubes welds cracked after 10 years service in N2 fluid content .

hi every one, During welding St.St 347 thk45 mm Dia./16inch of transfer line between ammonia converter and waste heat boiler we observed cracks in root toes. we use ER347Si for root passes and E347-15 for filling passes- and N2 as purging gas . the specification of line are -ammonia synthise gas...