The cladding rolling process will bring changes to the production of titanium alloy sheets

The production of domestic titanium alloy sheets is still mostly rolled by the single-piece method. Due to the poor low-temperature plasticity of titanium alloys and large cold deformation work hardening, it is extremely difficult to produce thin plates by the single-piece method. In order to make the rolling process go smoothly and reduce the temperature drop of the metal during the forging process, especially to reduce the chill on the surface of the billet, the die for forging titanium alloy needs to be preheated. Otherwise, the metal temperature drop and surface chill will make the metal not fill the mold groove well and may cause many cracks. Die preheating systems for titanium alloy forging are usually detachable, but sometimes a heating device mounted on the press is also used. Detachable die heating systems are usually gas heaters that slowly heat the die to the desired temperature range before the modules are assembled into the forging equipment. The heating device solidified on the press usually adopts induction heating or resistance heating. With the expansion of the market, the new technology of superplastic forming-diffusion joining of titanium alloy sheet has been widely used.

According to statistics, in the production of TC4 titanium plate, the invisible loss caused by alkaline pickling and grinding is as high as about 30%, the comprehensive yield is only about 35%, and the production cycle is long and the performance is unstable. The deformation rate of the cold rolling degree is not more than 25%, and it requires multiple cold rolling, intermediate annealing, and alkali pickling, and process defects such as cracks, edge cracks, slag removal, and cratering are prone to occur during rolling. Production process of titanium alloy plate (below 1.0mm), titanium alloy cross rolling and beta thermal process, self-developed stack rolling and clad rolling process, titanium and titanium alloy warm rolling technology, self-developed atmosphere protection controllable Cooling gravity creep correction technology and other key technologies for a series of flow rectification processes. In the test of the new production process of TC4 sheet, TC4 sheet with thickness of 0.6mm has been produced by cladding and rolling process, and it has been put into mass production.

Which parts of the tank can be made of titanium alloy

There are many reports on the application of titanium and titanium alloys in tanks in the United States, but in China, the former Soviet Union, and Russia, there are few reports on this aspect. In the 1990s, the Abrams M1 main battle tank and the Bradley M2 combat vehicle of the United States used many titanium alloy parts to replace the Rolled Homogeneous Armour (Rolled Homogeneous Armour). , RHA).

It is said that seven major steel components are replaced with titanium alloy forged ring on the M1A2 main battle tank: rotating turret plate, nuclear warfare, biological and chemical weapons countermeasure system shield, gunner main sight cover, engine top cover, turret pivot mount, command Hatch cover, vehicle commander thermal imaging observer cover. The total mass of these components made of steel was 1591kg. After changing to titanium alloy, the total mass dropped to 1116kg, a reduction of nearly 30%.

The command hatch and top attack armor of the M2 chariot were originally forged from aluminum alloys, and were later made of 100mm-127mm Ti-6Al-4V alloy plates. The attack armor was made of 80mm thick titanium alloy plates. Their mass ratio Steel parts are 35% lighter. The Ti-6Al-4V alloy was smelted in a low-cost electron beam cooling bed furnace, and a low-cost Ti-6A-1.7Fe-0.1Si Timetal 62S alloy was also developed

The effect of laser welding on the surface treatment of titanium rods!

The process parameters of laser welding are difficult to grasp, because the thermal efficiency fluctuates greatly during the welding process, and the surface condition of the welded titanium rod has a great influence on the thermal efficiency: the brighter the surface, the larger the emitted laser light, and most of the laser energy is reflected on other objects. , transferred to the surrounding material or medium in the form of "heat". But thermal efficiency changes suddenly. Before the titanium rod is melted, only about 10%-20% of the light energy is absorbed by the titanium rod and heats the titanium rod. When the temperature rises to the melting point of the weld metal and begins to melt, the light absorption rate of the titanium rod increases sharply . Grade 7 Titanium Rod company tells you that at this time, about 60%-80% of the light capacity is absorbed by the metal, and the sudden change of thermal effect can easily cause the weld to burn through.

In order to avoid or reduce this adverse effect, the grade 5 titanium rod company tells you that you can take corresponding measures, such as welding titanium rods; roughening the surface, using a pulsed laser beam; adjusting the input energy; adjusting the spot size; Pulse width and steepness.

A ruby ​​natural crystal containing aluminum oxide and dissolved with a low concentration of chromium atoms is used as the working material of the laser generator, which is called a solid-state laser generator. If CO2 is used as the working substance of the laser generator, it is called a force gas laser generator.

At present, the power of the laser welding machine is only kilowatts, and it is expensive, the welding cost is high, and the application range is not wide. It is only used for the solder joints of some tiny parts in the manufacture of some instruments and meters, especially when some solder joints are hidden and cannot be welded by ordinary welding methods. Multi-station welding is possible using laser beams, optical fibers and deflection prisms.

Introduction to the characteristics of titanium

Titanium is not toxic, even in large doses, and does not have any natural effects on the human body.

Powdered titanium and planed titanium flakes can easily cause fires and explode when heated in the air. Water and carbon dioxide-based fire extinguishing methods are ineffective against burning titanium; Class D dry powder fire extinguishing agents must be used instead.

When producing or handling chlorine, care must be taken that grade 5 titanium round bar should only be used where there is no dry chlorine around, otherwise it will cause a titanium/chlorine fire. Even wet chlorine is a fire hazard because it can dry out unexpectedly under unusual weather conditions.

A fresh, unoxidized surface of titanium may catch fire when it comes in contact with liquid oxygen. This surface can be formed by the collision of an oxidized titanium surface with a hard object, or within a crack caused by a mechanical strain. Therefore, the use of titanium in liquid oxygen systems is likely to be limited, such as in the aerospace industry.

Titanium flaw detection method---eddy current flaw detection

Eddy current testing is an alternating magnetic field generated by an alternating current acting on the conductive material to be tested, inducing eddy currents. If there is a defect in the material, it will interfere with the generated eddy currents, i.e. create an interference signal.

By detecting its interference signal with an eddy current flaw detector, the state of the defect can be known. There are many factors that affect the eddy current, that is to say, the eddy current contains abundant signals, and these signals are related to many factors of the material. How to separate the useful signals from the many signals is a difficult problem for the current eddy current researchers. , some progress has been made over the years, and some problems can be solved under certain conditions, but it is far from meeting the requirements of the scene and needs to be vigorously developed.

The remarkable feature of eddy current flaw detection is that it can work on conductive materials, not necessarily ferromagnetic materials, but the effect on ferromagnetic materials is poor. Secondly, the surface finish, flatness, and edge of the workpiece to be tested have a great influence on eddy current testing, so eddy current testing is often used for non-ferromagnetic workpieces such as copper pipes with regular shapes and smooth surfaces. Grade 2 Pure Titanium Bar

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Industrial Expansion Titanium Screw Usage

To install ceiling fans, chandeliers on ceilings, or install hanging cabinets on concrete walls, expanded titanium metric screw are a very suitable part. The hanging force is large, and the installation is also very simple by mastering the small skills of installing small screws.

This kind of screw has many forms and specifications, but the tomb is composed of three parts: the trunk, the screw and the nut. The installation method is as follows:

(1) Generally, if you hit the wall and hang it horizontally, it is not a problem to lift more than 100 pounds of screws with a diameter of 6 mm. Determine the location on the wall and drill a hole the same diameter as the screw, the depth of which is the length of the screw's trunk.

(2) Hit the trunk with the screw into the hole of the wall, use the screw to pass through the cabinet to be lifted, and tighten the nut. When the screw is tightened, the gap of the trunk is forced to open and stretch around, becoming an inverted shape. , so the hanging force is very large.

In addition, there is a plastic expansion screw whose hanging force is not as large as that of metal, but it is simpler and more convenient to use. Generally, a mirror frame is installed on the wall, and this kind of screw is enough to be safe.

(1) Punch a hole the same size as the screw, and the depth is the length of the screw.

(2) Install the plastic screw trunk in the hole.

(3) Because the main part of the opening is solid, when you screw a wood screw of the same size as the inner diameter of the trunk, the lower part of the trunk is forced to stretch out to form a wedge shape, which can increase the hanging. force effect.