Submerged arc welding process including a plurality of...

Details Submerged arc welding process including a plurality of... Submerged arc welding process including a plurality of...

B - Operations, Transporting

23

K

327/114, 327/41

B23K 9/18 (2006.01) B23K 33/00 (2006.01) B23K 35/36 (2006.01)

Patent

CA 1070772

ABSTRACT OF THE DISCLOSURE Submerged arc welding process for 3.5% Ni steel which can provide a welded portion having a satisfactory impact resis- tance at low temperatures such as below minus 100°C. In the process, use is made of a flux having a basicity as defined by a formula Image in weight percentages of between 1.5 and 3. The weld metal is deposited in a plurality of superimposed welded layers, each having a thickness less than 7 mm so that the weld metal in an underlying layer is thermally affected by an adjacent overlying layer whereby recrystallization is effected in sub- stantial thickness of the underlying layer to provide a fine crys- talline structure.

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