Submerged arc welding process

Details Submerged arc welding process Submerged arc welding process

1978-05-19

1980-04-01

Kucia, Richard R.

Electric heating

Metal heating

Nonatmospheric environment at hot spot

219 7612, 219 7614, 219137R, 219137WM, B23K 918

Patent

active

041963350

ABSTRACT:
Submerged arc welding process for 3.5% Ni steel which can provide a welded portion having a satisfactory impact resistance at low temperatures such as below minus 100.degree. C. In the process, use is made of a flux having a basicity as defined by a formula (CaO+MgO/SiO.sub.2) 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 substantial thickness of the underlying layer to provide a fine crystalline structure.

REFERENCES:
patent: 3919517 (1975-11-01), Ishizaki
patent: 3922634 (1975-12-01), Mulder
patent: 3944776 (1976-03-01), Tsuboi
patent: 4003766 (1977-01-01), Ito

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