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  1. engessam2001

    Cracks during welding of St.St 347 piping after eight years in-service

    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 .
  2. engessam2001

    Cracks during welding of St.St 347 piping after eight years in-service

    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...

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