The invention relates to a special metal welding method, in particular to a laser welding method of a rhenium alloy thin sheet, which comprises the following steps: (1) treatment before welding: cleaning oil stains and surface oxides at the welding part; (2) laser welding: adopting inert gas for protecting laser welding, using the inert gas for protecting the front surfaces and the back surfaces of weld seams and further preventing oxidation; and (3) cooling: closing the inert gas after cooling the weld seams, detaching a welding clamp and taking out a welded workpiece. Compared with the vacuum electron beam welding, the volume of the welded workpiece is not limited, and the operation is simple, thereby being applicable to the rhenium alloy thin sheet with the sheet thickness of 0.5-4mm, optimizing the welding parameters, realizing the one-sided welding with back formation of the rhenium alloy thin sheet, eliminating the welding defects of air holes and the like and leading the weld seam quality to achieve the I-level weld seam standard.

Laser welding method of rhenium alloy thin sheet

The invention relates to a double laser beam welding method for a T-shaped joint. The method comprises the step of continuously welding the whole T-shaped joint by using the double laser beams and is characterized by also comprising the position welding step before the continuously welding step, wherein in the position welding step, two joint seams of the T-shaped joint are subjected to tack welding by the double laser beams, so that positioning welding joints are formed on at least one of the two joint seams at intervals and the welding deformation of the T-shaped joint is reduced. Compared with the welding method which does not adopt the position welding step before the step of synchronously and continuously welding on two sides of the double laser beams, the double laser beam welding method for the T-shaped joint has the advantages of reducing welding deformation caused by synchronously and continuously welding on two sides of the double laser beams to the maximum degree and guaranteeing the accuracy of the welding route in the process of synchronously and continuously welding on two sides of the double laser beams. By the method, the welding quality is guaranteed; welding deformation is reduced; and production efficiency is improved.

Double laser beam welding method for reducing T-shaped joint welding deformation

The invention discloses a laser welding method for injection molding of an Al-Zn-Mg-Cu aluminum alloy The method comprises the following specific steps: abutting joint and arranging a test panel I to be welded and a test panel II to be welded on a base plate of a welding operation desk, wherein the direction of a jointing seam is the same as that of a groove which is arranged on the upper surface of the base plate; connecting a back shielding gas pipe into a gas passage, and setting a gas flow to be 13-15L/min; regulating the gas flow direction of a side-blowing gas pipe to be opposite to a welding direction, and setting a gas flow to be 25-28L/min; setting laser power to be 6-8KW; and opening the back shielding gas pipe and the side-blowing gas pipe, starting laser after the side-blowing gas pipe blows gas for 2-3 seconds, starting welding from a point A to a point B at a welding speed of 3-5m/min, and after the laser reaches the point B, stopping the laser first, and closing the side-blowing gas pipe and the back shielding gas pipe The laser with concentrated energy density is adopted as a heating source, and a weld joint has a small width and an extremely narrow heat-affected zone after the welding, so that the amount of an element Zn separated from the weld joint is greatly decreased, and the performance of the weld joint is improved

Laser welding method for injection molding of Al-Zn-Mg-Cu aluminum alloy

Laser welding clamp and protecting device for titanium alloy thin-walled workpiece in shape of complex space

The utility model discloses a laser welding machine suitable for brush seal, which comprises an executing mechanism, a light path, a gas path, an oil path, a water path, a monitoring system and a welding part fixture The laser welding machine is characterized in that the executing mechanism comprises a vertical base and a cantilever beam, the cantilever beam is fixedly connected to the vertical base, an X axis screw and an X sliding rail which are horizontally arranged and are parallel mutually are arranged on the cantilever beam, the X axis screw is connected with an X axis servo motor, the X axis sliding rail is connected with a Z axis cantilever in a sliding manner, and the Z axis cantilever is fixedly connected with a screw nut of the X axis screw; a Z axis screw and a Z sliding rail which are horizontally arranged and are parallel mutually are arranged on the Z axis cantilever, the X axis screw is connected with a Z axis servo motor, the Z sliding rail is connected with a laser welding head in a sliding manner and the laser welding head is fixedly connected with the screw nut of the X axis screw

Laser welding machine suitable for brush sealing

A dual light beams method for laser welding in order to symmetrically welding both sides of a workpiece at same time features that a laser beam generated by a laser device is splitted into two beams with same energy, which can reach the position to be welded at same time for synchronous welding. Its advantage is high welding quality and precision.

Dual light beams welding method for laser welding

An application method of the activator in laser welding of Ti alloy includes such steps as dissolving the powdered Ti-alloy activator A-TIG in acetone or alcohol, coating the solution on the position on workpiece to be welded, drying, and laser welding Its advantage is high weld quality

Method of application of activator in use for laser welding titanium alloy

The invention relates to a titanium alloy sheet forming process based on continuous laser scanning. The titanium alloy sheet forming process is characterized by including the steps of 1, coating a absorbing coating (1) in a continuous laser scanning path on a titanium alloy sheet surface (3), wherein the absorbing coating (1) includes CaF2 and TiO2, the mass ratio of CaF2 to TiO2 is 1:1, weighting CaF2 and TiO2 powder according to the ratio to be mixed with alcohol having 5-15 times of the mass ratio, stirring to form a suspension, and obtaining the absorbing coating (1) through the suspension, enabling the width of the absorbing coating (1) to be 5-20mm and the thickness to be 20-100 micrometers, 2, enabling a continuous laser scanning light beam to form an incident inclined angle alpha with a normal direction of the titanium alloy sheet surface (3), and 3, arranging a water cooling copper tank (4) along the continuous laser scanning path on the titanium alloy sheet surface (3) at the bottom of the titanium alloy sheet. Compared with the prior art, according to a same angle sheet formed through the novel process, the bending efficiency is increased by 50%, and the thickness of heat affected zones is remarkably reduced.

Titanium alloy sheet forming process based on continuous laser scanning

Titanium alloys is one of the most important materials and finds extensive application in aerospace industry because of its light weight, superior strength-to-weight ratio, and excellent corrosion resistance. Driven by cost and weight savings, technological progress is moving in the direction of replacing rivets and fasteners with welds. Laser welding with higher energy density can offer remarkable advantages over conventional fusion welding processes, such as minimal component distortion and high productivity, and is specifically suitable for joining aerospace structures. Therefore, it will be significant to investigate the laser welding of titanium alloys for developing the weight efficiency and improving the structure integrity of the military and commercial aerospace.In this paper, the author and his research group give a brief introduction of laser welding of typical aeronautic titanium alloys. The welding technique was studied. The welded defects and their eliminating technology have investigated. The microstructure and mechanical property of the welded joint have researched. Some researched results such as the behaviour of the welding pool has mentioned.Titanium alloys is one of the most important materials and finds extensive application in aerospace industry because of its light weight, superior strength-to-weight ratio, and excellent corrosion resistance. Driven by cost and weight savings, technological progress is moving in the direction of replacing rivets and fasteners with welds. Laser welding with higher energy density can offer remarkable advantages over conventional fusion welding processes, such as minimal component distortion and high productivity, and is specifically suitable for joining aerospace structures. Therefore, it will be significant to investigate the laser welding of titanium alloys for developing the weight efficiency and improving the structure integrity of the military and commercial aerospace.In this paper, the author and his research group give a brief introduction of laser welding of typical aeronautic titanium alloys. The welding technique was studied. The welded defects and their eliminating technology have investigated. T...

Laser welding of aeronautic titanium alloys

The utility model relates to a gas protector for laser welding and flush welding joint for titanium alloy boards, which is composed of a nozzle, a connecting sleeve, a pulling cover, two gas channels, a circular direction gas channel, and a side-blowing gas channel. The utility model has the integrated functions that the circular direction gas protects a welding pool, the rear pulling gas protects the back part of the front side of welding beads, and the side blowing gas expels the laser photo-induced plasma. The integrated side blowing gas channel can not only decrease the unfavorable influence of the laser-induced plasma on the laser energy transmission and improve the effective utilization rate and the welding process stability of the laser energy, but also can decrease the influence of the laser-induced plasma on other protection gas channels, and improve the protective effects; the utility model can realize the omnibearing protection for the welding high-temperature region by cooperating with welding clamping devices and laser welding joints.

Gas protector for laser welding and flush welding joint

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