Static molds – Container-type molding device – Having means enabling rotation of molding device – e.g.,...
Patent
1987-10-19
1990-02-20
Walberg, Teresa J.
Static molds
Container-type molding device
Having means enabling rotation of molding device, e.g.,...
2191372, 2191377, B23K 928, B23K 900, B23K 912
Patent
active
049028731
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to electric welding and more specifically to methods of electric-arc welding.
2. Description of Related Art
A method of consumable-electrode electric arc welding is in wirespread use nowadays, wherein a consumable electrode is fed into the welding zone, said electrode being in fact a round-section solid wire (of., e.g. `Techniques of electric fusion welding of metals and alloys`, edited by B. Ye. Paton, 1974, (Moscow) pp. 207-211, FIG. 5-50; p. 475, FIG. 9-6, Table 9--9; "Gas-shielded metal-arc welding" by A. G. Potapyevsky, 1974 (Moscow), p. 142, FIG. 55; p. 127, FIG. 49 (in Russian). Used as a shielding medium are a variety of fluxes or gases. Control of the welding current (amperage), size and shape a weld seam, and efficiency of the welding process is effected by varying the rate of feed of a metal-arc electrode into the welding zone, and by changing the welding voltage.
Filling-up of the weld end crater is carried out by appropriately varying the rate of feed of the metal-arc electrode and the value of the welding voltage.
According to the aforementioned electric-arc welding method a preset depth of penetration of the metal being welded is easily attainable due to a broad range of feed rates of a single cross-section metal-arc electrode. However, whenever it becomes necessary to increase the welding current (amperage), efficiency of the welding process and weld seam dimensions (e.g., for welding extra-thick metallic components without bevelled edge in the components being welded together and with a gapless joint therebetween), one must increase the rate of feed of the metal-arc electrode into the welding zone and the welding voltage value. This in turn involves excessive consumption of the welding materials and electric power, an oversize weld and impaired shape and quality of a welded joint of the components being welded together.
Moreover, necessity for a synchronous control of the welding amperage and welding voltage results sophistication of the welding equipment and affects its operating reliability. Filling-up of an end crater of the weld seam also involves complicated equipment, since the filling-up procedure is carried out by simultaneous control of the metal-arc electrode feed rate and of the welding voltage, which deteriorates the quality of the weld seam obtained.
Known in the present state of the welding art is a widely used method of electric-arc welding, wherein a metal-arc electrode fed into the welding zone is composed of two or more bare wires arranged parallel to one another and connected to the same source of welding current (cf., e.g., British Pat. No. 1,280,147, Int.Cl. B3R). All the wires that the electrode is made up of are fed into the welding zone at the same time.
Control of the welding amperage and efficiency of the welding process, and of the size and shape of the weld seam is carried out by varying the rate of feed of a metal-arc electrode into the welding zone and by changing the welding voltage.
According to the electric-arc welding method discussed above a preset depth of penetration of the metal being welded is easily attainable, since preset welding amperage and depth of penetration of the metal being welded correspond to each rate of feed of the metal-arc electrode, while the depth of penetration varies, in this particular case, in direct proportion to the welding amperage or current density effective in the metal-arc electrode. The electric-arc welding method under consideration suffers from a serious disadvantage, that is, the melting rate of the metal-arc electrode changes more intensity than the depth of penetration of the metal being welded, which is evident from the following formula: extension.
This results in too high consumption of the welding materials and electric power and makes it impossible to obtain a weld seam featuring satisfactory dimensions and shape of weld beads within a broad range of weld joint thickness of the components being welded, by virtue of el
REFERENCES:
patent: 2527336 (1950-10-01), Schaefer
patent: 2868956 (1959-01-01), Lobosco
patent: 4013868 (1977-03-01), Koshiga et al.
"Techniques of Electric Fusion Welding of Metals and Alloys", edited by B. Ye. Paton, 1974, pp. 207-211, Moscow.
"Gas Shielded Metal-Arc Welding", by A. G. Potapyevsky, 1974, (Moscow), p. 142.
Rogers Scott A.
Walberg Teresa J.
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