How do different titanium fittings work?

Titanium pipelines mainly transport severely corrosive and dangerous media. When the media with corrosive media passes through the titanium pipe fittings, the media carries a certain pressure, and each part of the various pipe fittings bears different pressures. The three most commonly used pipe fittings ( Elbow, tee, reducer) to analyze.

1. Elbow

The elbow is one of the important pipe fittings of various piping systems. In addition to changing the flow direction of the medium, it also improves the flexibility of the pipeline. When the medium passes through the elbow, the pressurized medium rushes directly to the back of the elbow, and the medium flows along the back to the outlet. It can be seen that the back of the elbow bears greater pressure and severe erosion and corrosion, indicating the backload Greater than any part.

2. Three links

The working condition of the tee is similar to that of an elbow. When the medium passes through the tee, it directly rushes to the intersection of the branch and straight road of the tee, where the bearing pressure and erosion-corrosion are greater than other parts. The branch is the pressure relief and diversion state of the main pipeline.

3. Reducer

The working condition of the reducer, when the medium passes through the reducer, the medium often flows from the large end to the small end. The gradual decrease of the cross-sectional area causes the pressure of the cone of the reducer to be increased, and the inner surface of the cone has a larger bearing capacity. The pressure is subject to severe erosion and corrosion.

The above analysis shows that titanium pipe fittings are extremely important parts of titanium pipelines, which directly affect the life of titanium pipelines.
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What factors have affected the development direction of titanium alloy plates?

It has always been loved by people for its good physical properties, lightweight, beautiful appearance, durability, easy recycling of materials, high reuse rate, and no pollution. However, the high price of titanium alloy plates, poor wear resistance and other factors, directly Affected the extensive use of titanium alloy plates. Therefore, how to reduce the price of titanium alloy materials and improve the wear resistance of titanium alloys has become the development direction of titanium alloy materials in the future.

Titanium alloy has high strength, low density, corrosion resistance, long service life, and high waste recycling price. After being scrapped, the value of titanium scrap is still equivalent to more than 60% of the purchase value of raw materials. It can be said that titanium material is the least wasted material. The green environmental protection of titanium will not cause any adverse effects on the environment; titanium alloy resources are rich and are the earth The upper storage volume ranks third, which can be said to be inexhaustible and inexhaustible. Therefore, the high cost of titanium alloy plate is only the first time the investment is relatively large.

However, if used for many years, titanium alloy plate is an ideal material for economical and practical use. In addition to the use of titanium alloy plates in the chemical, aerospace, and medical industries in China, even some household products have begun to try to use titanium alloy plates, such as titanium alloy doors and windows.

In order to improve the performance and grades of existing doors and windows in some domestic home furnishing industries, they have changed the low-level structure that only pursued labor-saving, material-saving, and low-price in the past, and realized the goal of shifting from sliding windows to better-performing casement windows. A transition from the main to realize diversified system designs such as single-layer, double-layer, three-layer and small opening and large fixing. At the same time, attention should be paid to the selection of frame materials, glass, spacers, and sealants for titanium alloy doors.

Titanium alloy doors can use TC4 and titanium plates to make door edges, handles, spoke reinforcement rings and ribs. Nowadays, some high-end villas have begun to use titanium alloy panel doors. After a long period of time, it has been proved that the use effect is very good, fully achieving the expected design goals, and adding beautiful scenery to people's lives and environment.
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What problems should be paid attention to during the cutting process of titanium plate?

Many people don't know how to cut more trouble-free in the process of using a titanium plate. Actual titanium plate cutting has a certain scientific basis. Here are 7 kinds of titanium plate cutting techniques.

(1) When cutting semi-automatically, first put the guide rail on the surface of the titanium plate, and then put the cutter on the guide rail, the order should not be reversed.

(2) Reasonably determine the cutting parameters according to the thickness of the titanium plate to obtain a good cutting effect.

(3) Check whether the cutting nozzle gas is unblocked. If there is a blockage, it should be cleared in time.

(4) In addition, before blowing out the slag, the slag should be cleaned up.

(5) The distance between the cutting nozzle and the surface of the titanium plate should be appropriate, too close or too far is not good.

(6) The preheating of the titanium plate should be sufficient to avoid affecting the cutting process.

(7) If you want to cut out workpieces of different sizes first, then you should cut out workpieces of different sizes first.
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Characteristics and special functions of titanium materials

The characteristics and special functions of titanium materials such as titanium alloy processed parts, titanium alloy forgings, titanium alloy pipes, etc.

The passivation of titanium depends on the presence of an oxide film. The corrosion resistance of titanium alloy workpieces in oxidizing media is obviously better than that of reducing media. High-speed corrosion will occur in the reducing medium. Titanium is not corroded in corrosive media such as seawater, wet chlorine, chlorite and hypochlorite solutions, nitric acid, chromic acid, metal chlorides, sulfides and organic acids. However, in the medium that reacts with titanium to generate hydrogen (such as hydrochloric acid and sulfuric acid), titanium generally has a high corrosion rate. However, if a small amount of oxidant is added to the acid, titanium will form a passivation film. Therefore, in a mixture of sulfuric acid-nitric acid or hydrochloric acid-nitric acid, titanium has corrosion resistance even in hydrochloric acid containing free chlorine. The protective oxide film of titanium is usually formed when the metal contacts water, even in the presence of a small amount of water or water vapor. If titanium is exposed to a strong oxidizing environment without water, it will quickly oxidize and produce a violent spontaneous combustion reaction. This behavior occurs in the reaction of titanium with fuming nitric acid containing excess nitrogen oxides and titanium with dry chlorine. However, in order to prevent this reaction, a certain amount of water is necessary.

Titanium is non-magnetic. It is used for submarine shell and will not cause explosion.

The thermal conductivity of titanium is only 1/5 of steel, 1/13 of aluminum, and 1/25 of copper. Poor thermal conductivity is a disadvantage of titanium, but it can be used in some cases.

The elastic modulus of titanium is about 55% of iron. As a structural material, low elastic modulus is a disadvantage.

The tensile strength of Ti-6Al-4V titanium alloy is 960mpa, the yield strength is 892mpa, the difference between the two is only 58mpa.

Titanium has a strong binding force with hydrogen and oxygen. Care should be taken to prevent oxidation and hydrogen absorption. Titanium welding should be carried out under argon protection to prevent contamination. Titanium tubes and thin plates should be heat treated in vacuum, and the micro-oxidizing atmosphere should be controlled during the heat treatment.

The clock of the same shape and size is made of titanium and other metal materials (copper and steel). When each clock is struck with the same force once, you will find that the vibrating sound of the titanium clock lasts for a long time, that is, the energy that is struck to the clock is not easy to disappear.

Special functions of titanium and titanium alloy machining parts:

Ti-50%Ni (atomic fraction) alloy has the ability to restore the original shape under certain temperature conditions, so it is called titanium shape memory alloy.

NbTi alloy, when the temperature drops to close to zero, the conductor made of NbTi alloy will lose resistance, so that any large current will pass through, the conductor will not generate heat or consume energy, so NbTi alloy is called a superconducting material .

Ti-50%Fe (atomic fraction) alloy has the ability to absorb a large amount of hydrogen. Using this feature of ferro-titanium alloy, hydrogen can be stored safely, that is, without using steel high-pressure cylinders to store hydrogen. Under certain conditions, titanium-iron alloy can also release hydrogen, so it is called hydrogen storage material.
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Titanium alloy deep hole thread processing technology

It is difficult to process deep hole threads of special material parts. For example, deep hole tapping on titanium alloy parts is very challenging. The scrapping of parts is very uneconomical due to the scraping effect caused by the break of the tap. Therefore, in order to avoid scratches, the correct tools and tapping techniques must be used.

Machining deep hole threads mean long-term contact between the tool and the workpiece. At the same time, more cutting heat and cutting force will be generated during the machining process. Therefore, when tapping small deep holes of special materials (such as titanium parts), tool damage and thread inconsistencies are likely to occur.

In order to solve this problem, two methods can be used: (1) increase the hole diameter before tapping; (2) use a tap specially designed for deep hole tapping.

The proper bottom hole is very important for thread processing. The larger threaded bottom hole can effectively reduce the cutting heat and cutting force during the tapping process. But it also reduces the thread contact rate.

The diameter increment of the threaded bottom hole mainly depends on the required thread contact rate and the number of thread heads per inch. Based on the above two values, the correct diameter of the threaded bottom hole can be calculated using the empirical formula.

Due to the difficulty of machining titanium parts, the cutting parameters and tool geometry must be fully utilized

Because titanium alloys have greater elasticity and deformation rate, a relatively small cutting speed is required. When machining small holes in titanium alloy parts, the recommended cutting speed is 10-14 inches per minute. We do not recommend using a lower speed because it will cause the workpiece to become hard during cold working. In addition, pay attention to the cutting heat caused by tool breakage.
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Use of titanium elbow

In the construction of various waterways and water pipes, we will use titanium alloy pipe elbows. What matters should we pay attention to when using titanium alloy elbows?

Titanium alloy pipe elbows have produced serious results and values ​​in equipment use, and have outstanding operating operations in certain environments and media.

According to the requirements of the workpiece and the surface condition, the titanium standard parts are received by alkali washing, water-soluble detergent, chlorine solvent sandblasting, shot blasting and other methods.

The titanium pipe elbow should be equipped with stable sealing performance to prevent the appearance of leakage and affect the normal operation of the pipe.

When the titanium alloy pipe elbow is equipped, the titanium alloy pipe elbow can be directly equipped on the pipeline according to the connecting steps, according to the application direction. Under normal circumstances, it can be equipped in the pipeline at any position, but it needs easy-to-operate inspection. The medium flow direction of the titanium alloy pipe elbow should be under the vertical valve and flow upward. The titanium alloy pipe elbow can only be equipped horizontally.
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The production process and welding quality of the titanium plate determine the quality of the titanium plate

A significant feature of the titanium plate is its strong corrosion resistance. This is because it has a particularly strong affinity for oxygen and can form a dense oxide film on its surface, which can protect titanium from corrosion by the medium. , Neutral saltwater solution has good stability in the oxidizing medium and has better corrosion resistance than existing stainless steel and other commonly used non-ferrous metals.

The quality of the titanium plate is largely determined by the smelting process of the titanium plate manufacturer, including the chemical composition of the titanium, the cleanliness of the titanium water (gas, harmful elements, inclusions) and the quality of the casting billet (component segregation, decarburization and Its surface condition), these aspects are the key control points of smelting operations.

In addition, industrial titanium plates also require sufficient hardenability to ensure uniform microstructure and mechanical properties across the spring section. The main cause of fatigue cracks in the oxide inclusions in titanium and the damage of type D inclusions to fatigue life is greater than that of type B inclusions. Therefore, foreign titanium factories and automobile factories have put forward higher requirements for the oxide inclusions in industrial titanium plates. For example, the Swedish SKF standard requires that the oxygen content in titanium is lower than 15-10-6, and the type D inclusions are lower than the type B inclusions. Things. In particular, Al2O3 and TiN inclusions are extremely harmful to the fatigue life of titanium springs. In order to produce high-quality industrial titanium plates, special smelting methods such as electric furnace-electro slag remelting or vacuum arc remelting are usually used in the past.

Because the titanium plate and titanium rod have special physical and chemical properties, their welding process is very different from other metals. Titanium welding is a TiG welding process that effectively protects the welding area by inert argon gas. Before using argon gas, check the factory certificate on the bottle body to verify the purity index of the argon gas, and then check whether the bottle valve leaks Or failure phenomenon.

When welding titanium plates and rods, you must ensure:

The metal in the welding zone is not polluted by the active gas NOH and harmful impurity elements CFeMn above 250℃. The purity shall not be less than 99.98%, and the water content shall be less than 50Mg/m32. Argon: industrially superior pure argon.

Can not form coarse grain structure. The welding process must be in accordance with the predetermined construction sequence, and can not produce large welding residual stress and residual deformation. so. Strictly follow the process of quality management standards and implement the whole process of quality control. All factors of human, machine, material and method are in a good controlled state, so as to ensure the welding quality of titanium pipe within a reasonable period of time.
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