Electric heating – Metal heating – By arc
Reexamination Certificate
1999-09-03
2001-10-02
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
By arc
C219S137700, C219S1370PS
Reexamination Certificate
active
06297473
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arc welding method. More particularly, the invention relates to a welding method with high efficiency and high quality, which is featured in that in a groove an arc generating point of a filler wire (distal end of a filler wire) is oscillated in the up and down direction, and an arc power density distribution at a groove face of base material is freely controlled.
2. Description of Related Art
It has conventionally been known in arc welding that sufficient arc heat input needs to be provided to a root portion of a groove in order to prevent a weld defect such as lack of fusion at a narrow gap portion (a root portion) of a narrow gap joint of an I, V, or K type. However; when a welding method having large weld heat input is used to sufficiently melt the root portion of a groove, there poses problems of deterioration in mechanical properties and deformation of the welded joint by a thermal cycle in the welding process. It is indispensable for resolving the problem to pertinently control dispersion and concentration of heat imput in the groove.
However, although various devices have been tried conventionally, it is not easy to freely control arc heat input distribution, and welding with high efficiency and high quality by enabling the control still poses a serious problem in an arc welding method.
SUMMARY OF THE INVENTION
Hence, according to the invention, in order to resolve the above-described problems, according to the first aspect of the invention, there is provided an arc welding method with a consumable electrode, wherein an arc welding operation performed by a wire consumable electrode system is carried out by controlling oscillation of a weld torch periodically in an arc axis direction (Z direction) at a groove between members to be welded. Further, according to the second aspect of the invention, there is provided an arc welding method of a consumable electrode type, wherein an arc welding operation performed by a wire consumable electrode system is carried out by controlling oscillation of a weld torch periodically in an arc axis direction at a groove between members to be welded, and by controlling a difference between a phase of a periodical variation in the position and a phase of a periodical variation of an arc current when the external characteristics of power source is periodically changed.
Further, in respect of the second aspect of the invention, the invention provides a method of carrying out a direct current arc welding operation by changing an arc current periodically as the third aspect of the invention, a method of carrying out an alternating current arc welding operation by changing the polarity of filler wire as the arc characteristics as the fourth aspect of the invention, a method of carrying out the arc welding operation by changing a current waveform as the fifth aspect of the invention, and a welding method in which a period of a variation of a position of a distal end of a wire of a weld torch and a period of a variation of the arc current are combined as the sixth aspect of the invention.
Further, according to the invention, in order to resolve the above-described problems, according to the seventh aspect of the invention, there is provided an arc welding method using a consumable electrode, wherein an arc welding operation performed by a wire electrode system is carried out by periodically varying a wire feed speed and controlling a difference between a phase of the wire feed speed variation and a phase of an arc current characteristic when the arc current is changed at a groove between members to be welded.
Further, in respect of the seventh aspect of the invention, the invention provides a method of carrying out a direct current arc welding operation by changing an arc current as the eighth aspect of the invention, a method of carrying out an alternating current arc welding operation by changing the polarity of a filler wire as the arc characteristics as the ninth aspect of the invention, a method of carrying out the arc welding operation by changing a current waveform as the tenth aspect of the invention, and a welding method in which a period of a variation of a position of a distal end of a wire of a weld torch and a period of a variation of the arc current are combined as the eleventh aspect of the invention.
REFERENCES:
patent: 3838244 (1974-09-01), Petrides et al.
patent: 4037078 (1977-07-01), Oishi et al.
patent: 4091258 (1978-05-01), Kano et al.
Hiraoka Kazuo
Nakamura Terumi
Yamamoto Hideyuki
Japan as represented by Director General of National Research In
Shaw Clifford C.
Wenderoth , Lind & Ponack, L.L.P.
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