Characterization studies with focus on the weld metal of a two-sided submerged arc production weld in an x70 HLSA line-pipe steel were carried out. A two-sided single pass laboratory weld was made using the same set of materials and consumables, and was compared with the production weld. All the welds were tested for their chemical composition, weld profile, microstructure, strength, microhardncss and Charpy impact toughness. Similarities and differences in welding conditions are outlined. A laboratory weld comparable to the production weld was obtained. It demonstrated higher toughness than the production weld at all test temperatures due to lower percentage of grain boundary phases. Inclusions with diameters between 0.5 and 0.7 micron improve the low temperature impact properties of the weld metal. The inside diameter weld has higher impact properties as compared with the outside diameter weld because of heat treatment imparted by the latter. The weld metal region was stronger and harder than the base metal and heat affected zone.


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    Title :

    Characterization and comparison of spirally welded HSLA steel line-pipe submerged arc production weld and a laboratory weld


    Contributors:
    Nemade, J.B. (author) / Bhole, S.D. (author)


    Publication date :

    2003


    Size :

    15 Seiten, 10 Bilder, 6 Tabellen, 16 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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