Flat-overhead position hybrid welding technique and device for aluminum alloy spiral pipe

Abstract

The invention provides a flat-overhead position hybrid welding technique and device for an aluminum alloy spiral pipe and belongs to the technical field of automatic welding. A spiral pipe blank rolling device, two pairs of rotating rollers, a first TIG welding gun, a second TIG welding gun and a plasma welding gun are arranged on a machine frame of the device. Under the positioning of the two pairs of rotating rollers, an aluminum alloy sheet is rolled into a spiral pipe blank with the required diameter according to a certain thread line through the spiral pipe blank rolling device firstly, and then fixed-length point fixing of the spiral pipe is conducted through the first TIG welding gun; then welding in an internal overhead welding position by the plasma welding gun and welding in a flat welding position of the spiral pipe by the second TIG welding gun are conducted synchronously; and plasma welding and second TIG welding are conducted synchronously through pulses, the plasma welding gun sprays cold argon gas to cool weld joints when the pulses are ended, cooling is conducted while welding is conducted, and finally automatic welding of the aluminum alloy spiral pipe is achieved. By the adoption of the flat-overhead position hybrid welding technique and device for the aluminum alloy spiral pipe, the welding efficiency of the aluminum alloy spiral pipe is improved easily, welding deformation of the spiral pipe is reduced, and the quality of a welded product is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of automatic welding, and specifically relates to the technical field of aluminum alloy spiral tube horizontal and vertical composite welding technology. Background technique [0002] The aluminum alloy spiral tube is made by rolling the aluminum alloy coil into a spiral tube billet according to a certain helical angle, and then welding the tube seam. In the spiral welded pipe production line, any traditional welding method such as fusion welding, resistance welding, gas welding, vacuum diffusion welding, etc. cannot meet the needs of welding different grades of aluminum alloys. Therefore, there is an urgent need for a device that has wide adaptability, high efficiency, and can meet the welding production of various grades of aluminum and aluminum alloy spiral welded pipes. [0003] For large-diameter steel spiral welded pipes, submerged arc automatic welding is generally used at home and abroad. After deca...

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Problems solved by technology

[0003] For large-diameter steel spiral welded pipes, submerged arc automatic welding is generally used at home and abroad. After decades of gradual improvement, this technology has matured and can produce high-quality spiral welded pipes, but submerged arc automatic welding is not suitable for aluminum alloy spiral pipes. welding

The manufacturing technology of aluminum alloy spiral welded pipe is mainly concentrated abroad, among which France and Germany have adopted advanced variable polarity TIG and plasma double-sided welding to realize the welding of aluminum alloy spiral pipe, but the production efficiency is low

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