Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1991-08-13
1992-12-15
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
219137WM, B23K 918
Patent
active
051719584
ABSTRACT:
A high-efficiency fillet welding method for conducting, without edge preparation, T-shape fillet welding of thick steel webs having a C content not more than 0.21 wt %. The welding is conducted by using a leading electrode (L) and a trailing electrode (T) composed of wires of about 4.8 to 6.4 mm diameter and containing C in an amount which meets the condition of formula (1), as well as 1.50 to 2.50 wt % of Mn. The welding is executed in such a manner that the ratio I.sub.T /I.sub.L of the current I.sub.T supplied to the trailing electrode (T) to the current I.sub.L supplied to the leading electrode (L) ranges from 0.75 to 1.00. The flux used in the welding is a bonded flux containing 60 to 91 wt % in total of SiO.sub.2, MgO and CaO, 5 to 30 wt % in total of TiO.sub.2, Al.sub.2 O.sub.3 and CaF.sub.2, 2 to 8 wt % of metal powder, said flux containing a carbonate gas-forming component in an amount to generate 2 to 10 wt % of gases by thermal decomposition of said carbonate during welding, and the balance incidental impurities, the flux having a bulk specific gravity of 0.80 to 1.20 g/cm.sup.3 :
REFERENCES:
patent: 3171944 (1965-03-01), Linnander
patent: 4214141 (1980-07-01), Okuda et al.
patent: 4363951 (1982-12-01), Shiga
patent: 5004884 (1991-04-01), Sakaguchi et al.
Hayashi Saburo
Meguro Yoshimitsu
Nakajima Matsushige
Yamaguchi Tadamasa
Kawasaki Steel Corporation
Miller Austin R.
Shaw Clifford C.
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