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6 results about "Upset welding" patented technology
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Upset welding (UW)/resistance butt welding is a welding technique that produces coalescence simultaneously over the entire area of abutting surfaces or progressively along a joint, by the heat obtained from resistance to electric current through the area where those surfaces are in contact. . Pressure is applied before heating is started and is maintained throughout the heating period. The equipment used for upset welding is very similar to that used for flash welding. It can be used only if the parts to be welded are equal in cross-sectional area. The abutting surfaces must be very carefully prepared to provide for proper heating. The difference from flash welding is that the parts are clamped in the welding machine and force is applied bringing them tightly together. High-amperage current is then passed through the joint, which heats the abutting surfaces. When they have been heated to a suitable forging temperature an upsetting force is applied and the current is stopped. The high temperature of the work at the abutting surfaces plus the high pressure causes coalescence to take place. After cooling, the force is released and the weld is completed.
Large-scale gas pressure welding process for medium-carbon low-alloy steel rails
The application discloses a medium-carbon low-alloy steel rail and a large-scale gas pressure welding process method. The medium-carbon low-alloy steel rail contains components with mass fractions as follows: C: 0.50%-0.63%, Si: 0.30%-0.60%, Mn: 0.55%-0.80%, Cr+Ni+Cu+V: 0.30%-1.0%, P and S: less than or equal to 0.025%, and the balance of Fe and inevitable impurities. The method comprises the following steps: using an oxygen-acetylene flame to heat a to-be-welded part of the steel rail, and closing the gas when the surface temperature of the to-be-welded part of the steel rail reaches 1200-1300 DEG C; performing upset welding; performing pressure maintaining and nodule pushing; and performing forced air cooling on a high-temperature joint after welding. The method optimizes the chemical composition of the alloy, and performs forced air cooling after gas pressure welding, so that a high-quality medium-carbon low-alloy steel rail welding joint with high strength and stable quality is obtained.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
Method for improving quality of large-sized air pressure welding joint of medium-carbon low-alloy steel rail
The present invention discloses a method for improving the quality of large-sized air-pressure welded joints of medium-carbon low-alloy steel rails, which comprises the following steps: heating the to-be-welded part of the rail with an oxygen-acetylene flame until the surface is in a semi-molten state; performing upset welding; performing a forging process, wherein the consumption of the forged rail is 1.5 to 3.0 mm, the forging time is 1.5 to 3.0 s, the average speed is 0.50 to 1.5 mm / s, and the forging pressure is 45 to 60 T; maintaining pressure after flash removal; and performing heat treatment on the welded joint of the rail. By adding a forging process after air-pressure welding, this method obtains high-strength and stable-quality high-quality welded joints of medium-carbon low-alloy steel rails.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
A high-power hot forging and upsetting welding machine and its welding process
The application discloses a high-power hot-state forging upsetting welding machine and a welding process thereof, which comprises an electrode, a clamp group is arranged above the electrode, a supporting table is arranged below the electrode and is used for supporting a welding object, a deslagging mechanism is arranged at the outlet of the supporting table, and a clamp group is arranged above the deslagging mechanism. The application adopts a brand-new material connection process, and the material temperature change at a welding position is controlled through monitoring in the whole process, so that better welding quality is achieved. Compared with the prior art, the application is not affected by the voltage fluctuation on site, the difference in environmental temperature and the change in air humidity and the like, and has better applicability.
Owner:KA LUO WEI DE (CHANG ZHOU) ZHI NENG HAN JIE ZHUANG BEI YOU XIAN GONG SI
ELECTRIC RESISTANCE BUTT WELDING MEMBER AND ELECTRIC RESISTANCE BUTT WELDING METHOD FOR PROVIDING A WHEEL RIM WELD PART WITH EXCELLENT FORMABILITY
A flash butt weld member and a flash butt welding method are provided to provide a wheel-edge welded part with excellent formability. The flash butt weld member of the present invention satisfies that a welded part has a hardness of 220-270 Hv, and d < 0.25T, where d is the nearest distance between the fine-grained heat-affected zones (HAZ) formed to the left and right of the welded part as they face each other, and T is the thickness of the welded base metal, and satisfies L / T > 2, where the overall length of a fitted part constituting the welded part is L.
Owner:POHANG IRON & STEEL CO LTD
Manufacture of at least one portion of an object, corresponding assembly tool, method for controlling the tool, and resulting objects
PCT designated stageWO2025210268A1Additive manufacturing apparatus3D object support structuresElectrical resistance and conductanceCarbon fibers
The invention relates to a method for manufacturing a thermoplastic-material portion of an object, this portion being intended to be assembled by resistance butt welding to a complementary thermoplastic-material portion of this object, comprising the following steps: a) providing an object portion made of thermoplastic material or additively manufacturing an object portion from thermoplastic material, which contains from 5% to 15% by volume of carbon fibres; and b) depositing, by additive manufacturing, a continuous carbon-fibre pattern onto the portion of step a), following a layout corresponding to the area intended to be heated during the assembly by resistance butt welding of the portion to the complementary portion and such that a voltage can be applied to two opposite ends of the continuous pattern during the assembly. The invention also relates to a corresponding assembly tool and a corresponding control method and to resulting objects.
Owner:AIRBUS DEFENCE & SPACE SAS
Anti-wrinkle welding tool
The utility model discloses a kind of anti-crease upset welding tool, including upper die part and lower die part, the upper die part and the lower die part are oppositely arranged, the upper die part includes upper die, upper pressure ring, upper die holder and nitrogen gas spring, the upper die holder inner wall is inserted and is assembled with upper pressure ring, the upper pressure ring inner wall is inserted and is assembled with upper die, the surface of the upper pressure ring is assembled with multiple nitrogen gas springs, and the nitrogen gas spring is connected with equipment main body, the lower die part includes lower punch, lower pressure ring, lower die holder and nitrogen gas spring, the lower die holder inner wall is inserted and is assembled with lower pressure ring, the lower pressure ring inner wall is inserted and is assembled with lower punch, the lower end of the lower pressure ring is assembled with multiple nitrogen gas springs, and the nitrogen gas spring is connected with equipment main body, so reduce the structure optimization part forming process wrinkling problem, improve material utilization, both can better guarantee product quality and can improve production efficiency.
Owner:SHENYANG LAIJIN AUTOMOBILE PARTS