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Differences Between Seamless Titanium Alloy Pipes And Welded Titanium Alloy Pipes

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Titanium tubes are generally divided into two types, one is extruded type called seamless titanium tube; the other is welded type called welded titanium tube.

  • The difference between seamless titanium tube and titanium welded tube

  • Extrusion type is called seamless titanium tube, seamless titanium tube has no weld seam

  • Welding type is called welded titanium pipe, titanium welded pipe has weld seam

  • The main difference between titanium welded pipe and seamless titanium pipe is the pressure bearing capacity.

  • Titanium tubes are generally divided into two types, one is extruded type called seamless titanium tube; the other is welded type called welded titanium tube.

 

Extruded Titanium Tube

Extruded titanium tubes include cold-rolled tubes, spinning tubes, and drawn tubes. Most of the extruded titanium products belong to the tube blanks of cold-worked tubes, and also include some hot-extruded tubes, special-shaped parts, profiles and composite materials used as finished products. The minimum specification of the pipe is 2mmx0.5mm in diameter, and the maximum length of the high-precision ultra-long pure titanium seamless pipe can reach 15m. There are two methods for preparing titanium tube blanks: one is the drilling/piercing extrusion process, which has a large metal loss, but the wall thickness of the tube blank is even; big. The hot extrusion of titanium plates and titanium alloys is performed using an extruder. Using glass lubricated extrusion, its extrusion ratio is larger than that of sheath extrusion.

  

Titanium alloy profiles are extruded in glass lubricated P-phase area, and the maximum extrusion ratio can reach 150. Generally, moderate speed (50~120mm/s) extrusion is used. The extrusion ratio of titanium is generally less than 30, the extrusion ratio used by TC4 titanium alloy. The three main types of lubricants used are grease, glass lubricant and metal cladding. Glass lubrication extrusion is currently the most advanced lubrication process in the world, but China's titanium tube glass lubrication extrusion has not yet reached the level of industrial application, and a breakthrough has been made in the glass lubrication extrusion of titanium alloy profiles. Overlubrication is the coating of copper, mild steel or other metals on the outside of the billet.

 

 

The metal clad extrusion process is complicated, the cost is high, and the pickling process is seriously polluted to the environment. The extrusion die is generally preheated to 300~400 degrees. Under normal circumstances, the service life of each extrusion BE die is about 20 times. For profile extrusion, in order to improve the dimensional accuracy of thin-walled profiles and the wear resistance of tooling and die, zirconia coating must be applied to the die by plasma method. When the specification is single and the batch is large, the use of skew rolling and piercing method to produce tube blank can obtain better technical and economic effects. There are two types of skew rolling piercing methods: two-roll skew rolling piercing and three-roll skew rolling piercing.

     

Welded titanium tube

Welded titanium pipe has short production process, high production efficiency, unlimited pipe length, and is suitable for the production of thin-walled pipes with relatively single specifications, varieties and brands and large batches. In recent years, more than 80 welded pipe production lines have been built or prepared by state-owned and private enterprises, and the proportion of welded titanium pipes in titanium pipes will gradually increase. Titanium plates and titanium alloy thin-walled welded pipes are difficult to manufacture and belong to high-end products. With the breakthrough of domestic titanium belt production technology, China has successfully mass-produced titanium welded pipes.

   

The production process of titanium welded pipe is: titanium coil - slitting forming - welding - shaping and sizing - heat treatment - straightening - eddy current, ultrasonic testing - air tightness testing - finished welded pipe. There are many forming methods of roll type continuous forming machine. Hangao Tech (SEKO Machinery) precision titanium alloy tube production line pipe making machine (for sale) is based on the W bending method. For titanium welded pipes, this forming method has good forming quality and is more suitable. The edge bending method is suitable for the production of welded pipes with a diameter greater than 200mm. The welding method of pipe seam mainly includes high-frequency welding and hand-to-mouth argon arc welding. When welding and after welding, when the weld is above 450T, argon gas protection is required. The seamless titanium alloy tube is a long titanium material with a hollow section and no seams around it. Titanium pipes have a hollow section, and many are used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials.

 

 

Compared with solid titanium materials such as round titanium, titanium tube has a lighter weight in terms of bending and torsional strength. It is an economical section titanium material and is widely used in the production of layout parts and mechanical parts, such as oil drill pipes and automobile transmission shafts. , bicycle racks and titanium scaffolding for construction roofs. Using titanium tube to make annular parts can improve the utilization rate of materials, simplify the production process, save materials and processing time, such as rolling bearing rings, jack sets, etc. It is now made of titanium tubes.

   

Titanium tubes can be divided into round tubes and special-shaped tubes according to the shape of the cross-sectional area. Because the circle area is the largest under the condition of the same perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform, so most titanium tubes are circular tubes. However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes. Some agricultural machinery skeletons, titanium wood furniture, etc. are commonly used. Square and rectangular pipes. Welded titanium alloy pipe, also known as welded pipe, is a titanium alloy pipe made of titanium plate or strip titanium after bending and forming. The production process of welded titanium alloy pipes is simple, the production efficiency is high, the types and standards are many, and the equipment capital is small.

  

What are the differences between seamless titanium alloy pipes and welded titanium alloy pipes ?

1. Welded titanium alloy tube is a hollow square-section titanium-titanium alloy tube, also known as hollow cold-formed titanium. Formed titanium with square cross-section shape scale made by high frequency welding. In addition to the thickening of the wall thickness of the thick-walled titanium alloy tube, the size of the corners and the straightness of the edges have reached or even exceeded the level of the cold-formed titanium alloy tube of resistance welding. The size of the R angle is usually 2-3 times of the wall thickness. Between. It can also produce the R angle titanium alloy tube of the size required by the customer according to the needs of the customer;

 

2. Titanium alloy pipe Seamless titanium alloy pipe is a long titanium material with a hollow section and no joints around it. It is a titanium alloy pipe formed by kneading a seamless pipe through the four sides of the mold. The titanium alloy pipe has a hollow section. Cross-section, many used as pipelines for transporting fluids. Mainly used in liquid transportation, hydraulic supports, mechanical layout, medium and low pressure. .

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Every time the finishing tube is rolled, it must go through the process of solution treatment. Ta ensure that the performance of the steel pipe meets the technical requirements. and to provide guarantee for the post-process processing or use. Bright solution treatment process of ultra-long seamless steel pipe has always been a difficulty in the industry.

Traditional electric furnace equipment is large,covers a large area, has high energy consumption and large gas consumption, so it is difficult for realize bright solution process. After years of hard work and innovative development, the use of current advanced induction heating technology and DSP power supply. Precision control of heating temperature to ensure that the temperature is controlled within t2C,to solve the technical problem of inaccurate induction heating temperature control. The heated steel pipe is cooled by "heat conduction"in a special closed cooling tunnel, which greatly reduces the gas consumption and is more environmentally friendly.
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