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To achieve high quality in titanium non-standard parts processing, you can start from the following:

1. Design stage:

Fully consider the needs and requirements of customers to ensure that the design of non-standard parts can meet specific functions and usage scenarios.

Considering the manufacturability and maintainability of non-standard parts, appropriate processing allowances should be reserved during design and the structure should be simplified to facilitate processing and maintenance.

2. Material selection:

Choosing high-quality titanium materials is the basis for improving the overall quality of non-standard parts. Titanium materials should have good chemical composition and physical properties to ensure that the processed parts have good mechanical properties and corrosion resistance.

3. Processing technology:

Using advanced processing technology, such as CNC precision machining, can improve processing accuracy and surface quality. CNC machining can ensure the dimensional accuracy and consistency of parts while reducing human errors.

Considering the difficulty of machining titanium, it is crucial to use tools and cutting parameters suitable for titanium machining. Titanium materials are prone to high temperatures during machining, so it is necessary to use efficient coolant and appropriate cutting speed to control the temperature.

4. Quality control:

During processing, strict quality control measures should be implemented, including raw material inspection, processing process monitoring, and finished product inspection.

Regularly maintain and calibrate processing equipment to ensure the accuracy and stability of the equipment.

5. Professional team:

Establish a professional technical team with rich experience and technical knowledge in titanium material processing, which can effectively solve the problems encountered during the processing.

6. Industrial chain support:

Taking advantage of the regional industrial chain, for example, Baoji has a complete titanium industry chain, which can provide comprehensive services and support from titanium ingots to the production and processing of titanium parts.

The above can greatly improve the quality of titanium non-standard parts processing and meet the needs of specific industries for high-performance non-standard parts.

Welding quality testing refers to the testing of welding results, to ensure the integrity, reliability, safety, and usability of the welded structure. In addition to the requirements for welding technology and welding processes, welding quality inspection is also an important part of welded structure quality management.

Let’s talk about the welding quality inspection method: sealing inspection.

So how to test the tightness of welded joints?

In general, the following methods can be used for detection:

1. Submersion test

Used for small containers or pipes subject to small internal pressure. Before the inspection, first, fill the container or pipe with compressed air at a certain pressure (0.4-0.5MPa), and then submerge it in water to check the sealing. If there is leakage, there must be bubbles in the water. This is also a common method for checking whether bicycle inner tubes are leaking.

2. Water test

Use the static pressure generated by the weight of water to check whether there are leaks in the structure. Mainly based on visual inspection, it is suitable for general welded structures that are not under pressure but require sealing.

3. Ammonia leakage test

The purpose is the same as the coal pump leakage test, and its sensitivity is higher than the kerosene leakage test. Before the test, first paste a white paper strip or bandage soaked in 5% mass fraction of HgNO3, aqueous solution, or phenolphthalein reagent on the side of the weld for easy observation, and then fill the container with ammonia or add 1% volume fraction of compressed nitrogen. Air.

If there is leakage, stains will appear on the white paper strip or bandage. Those soaked in 5% HgNO3 aqueous solution are black spots, and those soaked in phenolphthalein reagent are red spots.

4. Kerosene leakage test

It is used for welded structures subject to small internal pressure and requiring a certain degree of sealing. Kerosene has strong permeability and is very suitable for sealing inspection of welds. Before inspection, first brush lime water on one side of the weld for easy observation, and then brush kerosene on the other side of the weld. If there are penetrating defects, kerosene spots or kerosene bands will appear on the lime layer. The observation time is 15-30min.

5. Helium mass spectrometry test

The helium mass spectrometer test is currently the most effective means of sealing testing. The helium mass spectrometer is extremely sensitive and can detect helium with a volume fraction of 10-6. Before the test, the container is filled with helium, and then leaks are detected outside the weld of the container. The disadvantages are that helium is expensive and the inspection cycle is long.

Although helium has extremely strong penetrating power, it still takes a long time to penetrate extremely small gaps (such gaps cannot be detected by other means), and the leak detection of some thick-walled containers often takes dozens of hours. Appropriate heating can speed up leak detection.

6. Air tightness test

The Air tightness test is a routine inspection method for boilers, pressure vessels, and other important welded structures that require air tightness. The medium is clean air, and the test pressure is generally equal to the design pressure. The pressure should be increased step by step during the test.

After reaching the design pressure, apply soapy water on the outside of the weld or sealing surface and check whether the soapy water bubbles. Because there is a risk of explosion in the air tightness test, it should be carried out after the hydraulic pressure test is passed.

The air tightness test is different from the air pressure test:

1. Its purpose is different. The air tightness test is to test the tightness of the pressure vessel, and the air pressure test is to test the pressure resistance strength of the pressure vessel. Secondly, the test pressures are different. The air tightness test pressure is the design pressure of the container, and the air pressure test pressure is 1.15 times the design pressure.

The air pressure test is mainly to test the strength and sealing of the equipment, and the air tightness test is mainly to check the tightness of the equipment, especially small penetrating defects; the air tightness test focuses more on whether the equipment has small leaks, and the air pressure test focuses on to the overall strength of the equipment.

2. Use media

Air is generally used in the actual operation of the air pressure test. In addition to air, the air tightness test uses ammonia, halogen, or helium if the medium is highly toxic and does not allow leakage or is easy to penetrate.

3. Safety accessories

During the air pressure test, there is no need to install safety accessories on the equipment; the air tightness test can generally be performed after the safety accessories are installed (capacity regulations).

4. Sequence

The air tightness test needs to be carried out after the air pressure or water pressure test is completed.

5. Test pressure

The air pressure test pressure is 1.15 times the design pressure, and the internal pressure equipment needs to be multiplied by the temperature trimming coefficient; when the air tightness test medium is air, the test pressure is the design pressure. If other media are used, it should be adjusted according to the medium conditions.

6. Usage occasions

Pneumatic test: A Hydraulic test is preferred. If the hydraulic test cannot be used due to equipment structure or support reasons, or when the equipment volume is large, the pneumatic test is generally used. Air tightness test: The medium is a highly or extremely hazardous medium, or no leakage is allowed.

The air pressure test is a pressure test, which is used to check the pressure-bearing strength of the equipment. The air tightness test is a tightness test, which is used to test the sealing performance of the equipment.

What is a stainless steel metal hose?

Stainless steel pressure-resistant metal hoses are made of 304 stainless steel or 301 stainless steel. They are used as protective tubes for automation instrument signals and wire and cable protection tubes for instruments. The specifications range from 3mm to 150mm. Ultra-small diameter stainless steel hose (4mm-12mm) provides solutions for the protection of precision electronic equipment and sensor circuits. It is used for sensing circuit protection of precision optical rulers and industrial sensor circuit protection. It has good softness, corrosion resistance, high-temperature resistance, wear resistance, and tensile strength.

The structure of stainless steel pressure-resistant metal hose: it is made of stainless steel bellows braided with one or more layers of steel wire or steel belt mesh sleeves, with joints or flange heads at both ends, and is used to transport flexible components of various media. The characteristics of stainless steel pressure-resistant metal hose: are corrosion resistance, high temperature resistance, low temperature resistance (-196℃~+420℃), light weight, small size, and good flexibility. Widely used in aviation, aerospace, petroleum, chemical industry, metallurgy, electric power, papermaking, wood, textile, construction, medicine, food, tobacco, transportation, and other industries.

Precautions for installation and use of stainless steel pressure-resistant metal hoses:

1. The bellows of the stainless steel hose is made of chromium-nickel austenitic stainless steel. When using it, pay attention to prevent pitting corrosion of nitrogen ions and corrosive damage of dilute sulfuric acid and dilute sulfuric acid.

2. After users conduct hydraulic pressure tests on equipment and piping systems equipped with stainless steel hoses, they should prevent the impact of rust blocks and the deposition of chloride-containing sediment, which may cause corrosion and mechanical damage.

3. During installation, the metal hose must prevent burns from splashes and mechanical damage during welding, otherwise it will cause leakage.

4. Sealing piping systems should strictly abide by safe operating procedures to prevent hoses from pulling off or bursting due to overpressure caused by improper operation or other factors.

5. Please carefully digest the examples of stainless steel hose installation methods, and install and use them strictly by the correct outline.

Application scope and performance of GR5 titanium alloy

GR5 titanium alloy is also known as TC4 titanium alloy. We also call it 6Al4V. This is the most widely used titanium metal. It is usually referred to as the GR5 titanium alloy we use. It has good reach and extension.

Titanium and its alloys have many excellent properties such as lightweight, high strength, strong heat resistance, and corrosion resistance. They are known as the “metal of the future” and are new structural materials with promising development prospects. Titanium and its alloys not only have very important applications in the aviation and aerospace industries, but have also been widely used in many industrial sectors such as the chemical industry, petroleum, light industry, metallurgy, and power generation. Titanium can resist corrosion of the human body and does not harm the human body. Therefore it can be widely used in the medical and pharmaceutical industry sectors. Titanium has good suction properties and is widely used in electronic vacuum technology and high vacuum technology.

Top ten properties of GR5 titanium alloy

1. Low density and high specific strength

The density of titanium metal is 4.51g/cubic centimeter, which is higher than aluminum and lower than steel, copper, and nickel, but its specific strength ranks first among metals.

2. Corrosion resistance

Titanium is a very active metal with a very low equilibrium potential and a high tendency of thermodynamic corrosion in the medium. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weakly reducing media. This is because titanium has a great affinity with oxygen. In air or oxygen-containing media, a dense, highly adhesive, and inert oxide film is formed on the titanium surface, which protects the titanium matrix from corrosion. Even due to mechanical wear and tear, it will quickly heal itself or regenerate. This shows that titanium is a metal with a strong tendency to passivate. The titanium oxide film always maintains this characteristic when the medium temperature is below 315°C.

To improve the corrosion resistance of titanium, surface treatment technologies such as oxidation, electroplating, plasma spraying, ion nitridation, ion implantation, and laser processing have been developed to enhance the protection of the titanium oxide film and obtain the desired corrosion resistance. Effect. In response to the need for metal materials in the production of sulfuric acid, hydrochloric acid, methylamine solution, high-temperature wet chlorine, and high-temperature chloride, a series of corrosion-resistant titanium alloys such as titanium-molybdenum, titanium-palladium, titanium-molybdenum-nickel, etc. have been developed. Titanium-32 molybdenum alloy is used for titanium castings, titanium-0.3 molybdenum-0.8 nickel alloy is used for environments where crevice corrosion or pitting corrosion often occurs, or titanium-0.2 palladium alloy is used for parts of titanium equipment, both of which have been well used. Effect.

3. Good heat resistance

The new titanium alloy can be used for a long time at temperatures of 600°C or higher.

4. Good low-temperature resistance

The strength of low-temperature titanium alloys represented by titanium alloys TA7 (Ti-5Al-2.5Sn), TC4 (Ti-6Al-4V), and Ti-2.5Zr-1.5Mo increases as the temperature decreases, but the plasticity does not change. big. It maintains good ductility and toughness at low temperatures of -196-253°C, avoiding the cold brittleness of metal. It is an ideal material for low-temperature containers, storage boxes, and other equipment.

5. Strong anti-dumping performance

After titanium metal is subjected to mechanical vibration and electrical vibration, its own vibration attenuation time is the longest compared with steel and copper metals. This property of titanium can be used as tuning forks, vibration components of medical ultrasonic pulverizers, and vibration films of high-end audio speakers.

6. Non-magnetic and non-toxic

Titanium is a non-magnetic metal and will not be magnetized in a large magnetic field. It is non-toxic and has good compatibility with human tissue and blood, so it is used by the medical community.

7. Tensile strength is close to its yield strength

This property of titanium shows that its yield-strength ratio (tensile strength/yield strength) is high, indicating that titanium metal materials have poor plastic deformation during forming. Due to the large ratio of titanium’s yield limit to elastic modulus, titanium has a large resilience during molding.

8. Good heat exchange performance

Although the thermal conductivity of titanium metal is lower than that of carbon steel and copper, due to titanium’s excellent corrosion resistance, the wall thickness can be greatly reduced, and the heat exchange method between the surface and steam is dropwise condensation, which reduces the heat group and is too superficial. No scaling can also reduce thermal resistance, significantly improving the heat transfer performance of titanium.

9. Low elastic modulus

The elastic modulus of titanium is 106.4GPa at room temperature, which is 57% of steel.

10. Suction performance

Titanium is a metal with very active chemical properties and can react with many elements and compounds at high temperatures. GR5 titanium alloy breathing mainly refers to the reaction with carbon, hydrogen, nitrogen, and oxygen at high temperatures.

Inconel 718 material is a precipitation-hardened nickel-chromium alloy with high creep rupture strength at elevated temperatures up to approximately 700°C (1290°F). It has higher strength than Inconel X-750 and better low-temperature mechanical properties than Inconel 90 and Inconel X-750.

Its main features: good creep rupture strength at high temperatures.

Inconel 718 has good resistance to organic acids, bases and salts as well as seawater. It has good tolerance to sulfuric acid, hydrochloric acid, hydrofluoric acid, phosphoric acid and nitric acid. Good oxidation resistance, carburizing, nitriding and molten salt capabilities. Good resistance to vulcanization.

Age-hardened Inconel 718 combines high-temperature strength, corrosion resistance and excellent machinability up to 700 °C. Its welding properties, especially its resistance to post-weld cracking, are excellent. Due to these properties, Inconel 718 material is used in parts of aircraft turbine engines; high-speed airframe components such as wheels, buckets, washers, etc.; high-temperature bolts and fasteners, cryogenic storage tanks, and in oil and gas exploration and nuclear engineering. part.

As we all know, ordinary cutting tools cannot cut Inconel 718 material. By far the most suitable cutting method for Inconel 718 is the new circular diamond wire cutting technology. Different from the traditional wire cutting method, loop wire cutting is very suitable for cutting this hard and brittle material. It has many advantages such as fast cutting speed, high efficiency, less consumables, simple and convenient operation, etc.