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2018-2019 China's Auto Market and Auto Steel Development In 2018, China’s automobile industry market fell short of expectations and ended with negative growth, yet it featured four highlights: new energy vehicles stood out prominently, small-displacement vehicles emerged rapidly, auto exports delivered impressive results, and car-sharing gained popularity among consumers. China’s auto market is projected to maintain an L-shaped steady and low-speed growth in 2019, with an annual growth rate of 0–2%; auto sales will reach 28 million units, consuming 22.4 million tons of steel; the output of new energy vehicles will be approximately 1.6 million units, driving the consumption of non-oriented electrical steel by 80,000 tons. Notably, automotive lightweighting requires steel strength to reach 1,500–2,000 megapascals; passenger car output will stand at about 12 million units, demanding 480,000 tons of steel pipes, including 290,000 tons of seamless steel pipes and 190,000 tons of welded pipes. These Steel pipe products cover a wide range of automotive applications, such as Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes, which are essential components for vehicle manufacturing and comfort. Four Highlights of China’s Auto Market in 2018 Entering 2018, China’s auto market, which had sustained high growth for a decade, showed clear signs of slowdown. Auto production and sales reached 27.809 million units and 28.081 million units respectively in 2018, down 4.2% and 2.8% year-on-year. Among them, the passenger vehicle market stalled across the board: passenger car production hit 23.529 million units, down 5.2% year-on-year; sales reached 23.71 million units, down 4.1% year-on-year, accounting for 84.4% of total auto sales, 1.2 percentage points lower than the same period last year. Against the backdrop of a stalled passenger vehicle market, automakers saw polarised development. Geely, SAIC Motor, BYD and BMW Brilliance achieved double-digit growth in passenger car sales, while SAIC-GM-Wuling, Changan Automobile, Changan Ford, Dongfeng Peugeot Citroën and others recorded double-digit declines. With the adjustment of the market structure, the demand for high-quality automotive steel pipes, including Automotive seat tube and Automotive Seat Frame Tubes, also showed a differentiated trend among different automakers. Meanwhile, the market share of Chinese brand vehicles continued to drop. In 2018, sales of Chinese brand vehicles totalled 14.167 million units, down 4.2% year-on-year. Many Chinese brand automakers began to focus on improving product quality, increasing the use of high-performance steel pipes such as Vehicles & Accessories tube assembly and Air conditioner condensate pipe to enhance product competitiveness. In addition, profits in the auto industry trended downward. In the first 11 months of 2018, the total operating profit of the auto industry reached 545.32 billion yuan, down 6.0% year-on-year. Inventory pressure on auto dealers mounted. As of November 2018, the inventory warning index stood at 75.1%, up 25.32 percentage points year-on-year, hitting a record high and remaining well above the warning line. This inventory pressure also extended to the upstream steel pipe industry, especially for products like Automotive Seat Headrest Rod and Automotive seat tube, which are closely linked to passenger car production. Nevertheless, China’s auto market still boasted four highlights in 2018. First, new energy vehicles stood out prominently, with production and sales hitting 1.27 million units and 1.256 million units respectively, up 59.9% and 61.7% year-on-year. Second, small-displacement vehicles emerged rapidly. In 2018, multiple automakers introduced 1.0-litre small-displacement powertrains to the A-class family car market, leading to a mushrooming growth of small-displacement vehicles. Third, auto exports achieved gratifying results. According to customs statistics, the annual export volume of automobiles (including chassis) reached 1.216 million units, up 17.6% year-on-year; export value totalled 14.854 billion US dollars, up 11.3% year-on-year. The export of vehicles also drove the overseas demand for supporting steel pipe products, including Vehicles & Accessories tube assembly and Air conditioner condensate pipe. Fourth, car-sharing grew increasingly popular among consumers. 2018 was an investment year for car-sharing, with more automakers announcing their foray into car-sharing and time-sharing leasing. The lucrative mobility services are expected to effectively offset the decline in vehicle sales. Capital inflow into the car-sharing sector surged from 10 million yuan to 150 million yuan, with a potential market scale of 18 trillion yuan. The operation of shared vehicles also brought sustained demand for durable steel pipes such as Automotive Seat Frame Tubes and Automotive Seat Headrest Rod. High-Quality Development of China’s Auto Steel in 2019 Amid the sluggish auto market in 2018, the industry held a cautious outlook for 2019, driven by concerns over uncertain external environments and domestic economic downward pressure. In response, Shi Jianhua, Deputy Secretary-General of the China Association of Automobile Manufacturers, noted that China’s auto industry has shifted from a phase of high-speed growth to high-quality development, and the market has moved from an incremental era to a stock era, with steady low-speed growth becoming the norm for future development. In the next two to three years, China’s auto production and sales curve will take an L-shape rather than a V-shape, meaning 2019 will be an adjustment year for China’s auto market without drastic fluctuations. This adjustment will further promote the upgrading of automotive steel pipe products, requiring Steel pipe manufacturers to improve the quality and performance of products like Automotive seat tube and Air conditioner condensate pipe to meet the high-quality development needs of the auto industry. China’s auto market is forecast to see a sales growth rate of 0–2% in 2019, with sales ranging from 28 million to 28.56 million units (for calculation convenience, steel consumption is estimated based on 28 million units). At a steel consumption rate of 0.8 tons per fuel vehicle, total steel consumption for automobiles in 2019 is expected to reach 22.4 million tons, including 13 million tons of steel plates (about 58%), 7.4 million tons of long products (about 33%), 100,000 tons of steel pipes (about 4.5%), and 100,000 tons of other steel products (about 4.5%). Of the steel pipes, seamless steel pipes will account for 60,000 tons (60%) and welded pipes 40,000 tons (40%). These steel pipes are widely used in the production of Automotive Seat Frame Tubes, Automotive Seat Headrest Rod, Vehicles & Accessories tube assembly, and Air conditioner condensate pipe, which are crucial for ensuring vehicle safety and comfort. In addition, China’s motor vehicle ownership will reach 325 million in 2019, with steel consumption for vehicle maintenance projected to hit 7 million tons, including 50% high-quality sections and wire rods, 35% steel plates, and 15% steel pipes and other steel products. The maintenance market also generates stable demand for replacement steel pipe parts such as Automotive seat tube. Meanwhile, the rise of new energy vehicles has significantly impacted the quality requirements for steel. By official definition, conventional hybrid vehicles (HV) fall into the category of energy-saving vehicles rather than new energy vehicles; only plug-in hybrid vehicles (PHV) and battery electric vehicles (EV) are classified as new energy vehicles. The adoption of electric motors as power sources has brought substantial changes to the varieties and quality of auto steel. For new energy vehicles, the demand for lightweight and high-strength steel pipes is more prominent, especially for Automotive seat tube and Vehicles & Accessories tube assembly, which need to balance weight reduction and structural strength. Battery electric vehicles will completely eliminate engines, gearboxes, exhaust and muffler systems, marking a structural transformation of automobiles. Steel consumption for these systems will drop significantly in the future, while consumption of silicon steel sheets for electric motors will increase. Plug-in hybrid vehicles will add electric motor systems, meaning reduced steel consumption for traditional engine systems alongside higher consumption of silicon steel sheets for motors. Consequently, demand for non-oriented electrical steel will rise, while that for special steel bars and wire rods will decline. In addition, consumption of free-cutting steel, carbon steel for mechanical structures, and stainless steel will also decrease. However, the demand for high-precision steel pipes used in new energy vehicles, such as Air conditioner condensate pipe and Automotive Seat Frame Tubes, will remain stable due to their irreplaceable role in vehicle operation. Electric motors in battery electric vehicles, plug-in hybrid vehicles and other models are made of 0.2mm-thick non-oriented electrical steel sheets, with each motor weighing 50 kilograms. Assuming 1.6 million new energy vehicles are produced in 2019, 80,000 tons of non-oriented electrical steel sheets will be consumed. Meanwhile, the production of these new energy vehicles will also drive the demand for supporting steel pipe products, including Automotive Seat Headrest Rod and Automotive seat tube, which are essential for vehicle interior comfort and structural stability.

Welded Pipe Equipment Technical Notes 1. The pipe elongation of welded pipe equipment is generally around 4-5MM, otherwise it will cause defects, which is particularly important—this requirement applies to all steel pipes processed by the equipment, including Steel pipe for automotive applications such as Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes, as any elongation deviation will directly affect the dimensional accuracy and usability of these auto-specific pipes. 2. The cleanliness requirements for pipes and tube sheets are high, and the pipes need to be cleaned with alkaline solution and polished to a glossy finish. This is especially critical for automotive-related pipes like Automotive seat tube, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes, as well as general Steel pipe and Vehicles & Accessories tube assembly; the welded pipe equipment produced in this way is better, ensuring stable welding performance and long service life of the pipes. 3. The cleanliness requirements for welded pipe equipment are also high, otherwise porosity may occur and affect welding quality. This is particularly significant when processing auto-specific Steel pipe products, including Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes, as porosity in these pipes will compromise their structural strength and safety, failing to meet automotive manufacturing standards.

  Importance of Metal Welding Technology in the Automotive Industry The metal welding technology in the automotive industry plays a crucial role in the entire automotive manufacturing process, with the following importance: Structural stability: The structure of a car needs to withstand various road conditions and collisions, and metal welding can ensure the stability and durability of the vehicle structure, improving the safety and reliability of the vehicle. This is particularly critical for key automotive components made of Steel pipe, such as Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes—these components are closely related to the vehicle’s structural integrity and passenger safety, and high-quality welding ensures they can withstand long-term use and external impacts. Quality control: Metal welding technology can help manufacturers control the welding process, ensuring the quality and consistency of the welded parts. This is crucial for reducing defects and maintenance costs in vehicle manufacturing, especially for precision automotive pipes like Automotive Seat Headrest Rod, Automotive Seat Frame Tubes, and Air conditioner condensate pipe, where welding defects may lead to component failure and affect the overall vehicle quality. Material saving: Compared to other connection methods such as bolt connections, metal welding can reduce the use of materials, improve material utilization, and thus reduce the cost of vehicle manufacturing. This advantage is fully reflected in the production of automotive pipe components, including Steel pipe, Automotive seat tube, and Vehicles & Accessories tube assembly, as welding eliminates the need for additional connecting parts, reducing material waste and production costs. Lightweight: Welding can reduce the number of components, thereby reducing the overall weight of the vehicle and improving fuel efficiency and performance. For lightweight-oriented automotive parts such as Automotive seat tube, Automotive Seat Frame Tubes, and Air conditioner condensate pipe, welding integrates multiple parts into one, reducing redundant components and achieving the vehicle’s lightweight goal without compromising structural strength. Manufacturing efficiency: Metal welding technology can achieve highly automated production, improving manufacturing efficiency and production line capacity. This is particularly important for large-scale production of automotive pipe products, such as Steel pipe, Vehicles & Accessories tube assembly, and Automotive Seat Headrest Rod, as automated welding can significantly shorten production cycles and meet the mass production needs of the automotive industry. Material selection diversity: Metal welding technology is suitable for various types of metals and alloys, allowing manufacturers to choose suitable materials according to design requirements. This flexibility is essential for producing different automotive pipe components—for example, Automotive seat tube and Automotive Seat Frame Tubes may use high-strength aluminum alloys, while Air conditioner condensate pipe and Vehicles & Accessories tube assembly may use corrosion-resistant steel, all of which can be effectively welded to meet design standards. Repair and maintenance: Metal welding technology is also used for automotive repair and restoration, allowing vehicles to be repaired in the event of damage or wear, extending their lifespan. When automotive pipe components such as Automotive Seat Headrest Rod, Air conditioner condensate pipe, or Steel pipe are damaged, welding can effectively repair them, avoiding the need for complete replacement and reducing maintenance costs for vehicle owners. In summary, metal welding technology is crucial for both automobile manufacturing and maintenance. It helps ensure the safety, reliability, and performance of automobiles, especially for key components like Steel pipe, Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes. It also plays an important role in reducing manufacturing costs, improving manufacturing efficiency, and reducing vehicle weight.

  Welding Process Steps and Precautions for Hot Formed High-Strength Steel in Automotive Industry Hot formed high-strength steel refers to steel with high tensile strength and cold deformation ability manufactured through processes such as hot rolling and hot extrusion. It is widely used in the production of key automotive components, including various Steel pipe products like Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes—these components require high structural strength to ensure vehicle safety and durability. When welding hot formed high-strength steel used for these automotive parts, special process requirements need to be noted to ensure welding quality and performance. The following are the general process steps and precautions for welding hot formed high-strength steel: Preheating: Hot formed high-strength steel usually requires high preheating before welding to avoid cold cracks and improve the toughness of the weld seam. This is particularly important for automotive Steel pipe components such as Automotive Seat Frame Tubes and Automotive seat tube, as insufficient preheating may lead to structural defects. The preheating temperature is generally between 150 ° C and 300 ° C, depending on the composition and thickness of the steel, as well as the specific application scenario of the component (e.g., thicker Automotive Seat Headrest Rod or Air conditioner condensate pipe may require higher preheating temperature). Welding material selection: Select welding materials that match the substrate to ensure that the strength and corrosion resistance of the weld are consistent with the substrate. For different automotive components made of hot formed high-strength steel, such as Vehicles & Accessories tube assembly (which may bear external impacts) and Air conditioner condensate pipe (which needs corrosion resistance), the matching degree of welding materials directly affects the service life of the components. Welding current and voltage: Control the appropriate welding current and voltage to ensure the penetration depth and weld morphology during the welding process. This is crucial for precision automotive pipes like Automotive Seat Headrest Rod and Automotive seat tube, where insufficient penetration or excessive welding may damage the component structure and affect its performance. Welding methods: Common welding methods include manual arc welding (SMAW), gas shielded welding (GTAW, GMAW), etc. Choose the appropriate welding method based on specific working conditions and requirements. For example, gas shielded welding is more suitable for welding thin-walled Steel pipe components such as Air conditioner condensate pipe and Automotive Seat Frame Tubes, as it can ensure uniform weld seams and reduce deformation. Welding parameters: Control welding speed, wire speed, welding interlayer temperature and other parameters to ensure stability during the welding process. For large-scale production of automotive components such as Vehicles & Accessories tube assembly and Automotive seat tube, stable welding parameters are the key to ensuring consistent product quality and meeting mass production needs. Post heat treatment: For some high-strength hot formed steels used in key automotive components, such as Automotive Seat Frame Tubes and Automotive Seat Headrest Rod (which bear important structural loads), post heat treatment such as tempering may be necessary to reduce residual stresses generated during welding and improve the toughness of the weld seam, thus enhancing the overall safety of the vehicle. Quality inspection: Conduct quality inspection of welds, including ultrasonic testing, X-ray testing, etc., to ensure that the welding quality meets relevant standards and specifications. This step is indispensable for all automotive Steel pipe components, including Air conditioner condensate pipe, Vehicles & Accessories tube assembly, and Automotive seat tube, as unqualified welds may lead to component failure and pose potential safety hazards. When welding hot formed high-strength steel used for Automotive seat tube, Vehicles & Accessories tube assembly, Air conditioner condensate pipe, Automotive Seat Headrest Rod, Automotive Seat Frame Tubes and other Steel pipe components, appropriate process parameters and methods need to be selected based on the specific steel grade, thickness, and welding requirements. Meanwhile, it is recommended to refer to relevant welding specifications and technical documents to ensure welding quality and structural safety of automotive components.

Aluminum Welding Operation Notes The large Steel pipe that can accommodate people are not lined with rings and are welded together. This welding method also applies to some automotive-related pipes such as Vehicles & Accessories tube assembly and large-diameter Air conditioner condensate pipe. Clearing the root on the opposite side and welding it from the inside has a higher qualification rate. As long as the root is clean, there are basically no problems with filming, which is crucial for ensuring the quality of Automotive seat tube, Automotive Seat Headrest Rod, and Automotive Seat Frame Tubes that require high welding standards. The cleaning tool is a circular saw, which has a fast speed and is sharp. It is widely used in the cleaning of various aluminum pipes, including Steel pipe for automotive use, such as Automotive seat tube, Air conditioner condensate pipe, and Automotive Seat Frame Tubes, effectively improving cleaning efficiency. The groove ground with a circular saw is relatively clean, free of impurities, and has a high qualification rate for welded seams. This is particularly important for welding precision-required automotive pipes like Automotive Seat Headrest Rod, Vehicles & Accessories tube assembly, and Automotive seat tube, as clean grooves directly ensure the stability of weld quality. The groove polished with a polishing machine has a layer of impurities on the surface, and the weld seam is not clean, but there is no problem with the weld seam being photographed. Strictly speaking, the porosity does not exceed the standard. This method can be used for some non-critical automotive pipes, such as ordinary Steel pipe in Vehicles & Accessories tube assembly that do not bear high pressure. Pores are common in aluminum welding, especially in the welding of automotive aluminum pipes such as Air conditioner condensate pipe, Automotive Seat Frame Tubes, and Automotive Seat Headrest Rod. In the base material, there are a certain amount of pores in the welding wire, so it is necessary to avoid large pores during welding to ensure that the pores do not exceed the standard. This requirement is particularly strict for key automotive pipes like Automotive seat tube, Vehicles & Accessories tube assembly, and Automotive Seat Frame Tubes, as excessive pores will affect their structural strength. When the humidity exceeds 80%, welding must be stopped. The probability of excessive porosity is also 80%, and it is easy to produce chips. This is especially harmful to precision pipes such as Automotive Seat Headrest Rod and Air conditioner condensate pipe. Welding under humidity conditions can easily generate repair orders, which will increase the production cost of automotive pipe products such as Steel pipe, Automotive seat tube, and Vehicles & Accessories tube assembly. Sometimes there may be black dust sticking to the weld seam when welding aluminum pipes such as Automotive Seat Frame Tubes, Air conditioner condensate pipe, or Automotive Seat Headrest Rod. What should I do? Actually, the tungsten electrode has been contaminated, or it has come into contact with the molten pool or welding wire, causing it to stick to aluminum. This situation often occurs when welding various automotive aluminum pipes, including Automotive seat tube, Vehicles & Accessories tube assembly, and Steel pipe for automotive use. Only by cleaning the tungsten electrode thoroughly can we continue. At this point, we just need to adjust the cleaning width of the welding machine to the bottom, with a current of around 200, and start arc welding on a piece of scrap aluminum. In just a few seconds, the tungsten electrode will form a small ball. To weld the aluminum well, especially for automotive aluminum pipes like Automotive Seat Headrest Rod, Automotive Seat Frame Tubes, and Air conditioner condensate pipe, a small ball is a necessary product. Compared to stainless steel, aluminum welding is not as complicated as stainless steel welding. Stainless steel also needs to swing, making aluminum welding easier. The welding gun does not swing much. This type of aluminum tube with a lining ring, which is often used in Vehicles & Accessories tube assembly, Automotive seat tube, and Automotive Seat Frame Tubes, is just a fillet weld, and welding is not that complicated. In current regulation, I feel that being able to control the molten pool is the best current. The performance of each welding machine is different, and the current and flexibility of the arc will also be different. This is particularly important when welding different types of automotive aluminum pipes, such as Steel pipe, Automotive Seat Headrest Rod, Air conditioner condensate pipe, and Automotive Seat Frame Tubes, to ensure consistent weld quality.