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As of the end of May this year, Jilin Petrochemical Company calcium carbide plant 60,000 tons/year industrial acetaldehyde plant has not experienced "sub-combustion" phenomenon for 219 consecutive days.
The calcium carbide one-step oxidation process introduced by the calcium carbide plant from Germany 20 years ago produced an industrial acetaldehyde plant. As the running time becomes longer, “sub-combustion reactions†often occur in recent years, and if they are not dealt with in time, they will lead to interlocked parking. For each "sub-combustion reaction", 3.5 tons of ethylene is consumed and 10 tons of acetaldehyde is reduced. In response to this situation, the plant technicians regularly monitor the inner wall of the reactor while enhancing the frequency of equipment maintenance, optimize the process parameters, and reasonably adjust the amount of continuous hydrochloric acid to be added, so as to solve the hidden trouble of the sub-combustion device. .
Iron-based alloy powder is commonly used in plasma transfer arc welding (PTAW) due to its excellent mechanical properties and high resistance to corrosion and heat. This type of powder is typically composed of iron as the base metal, along with various alloying elements such as nickel, chromium, molybdenum, and tungsten.
The specific composition of the iron-based alloy powder may vary depending on the desired properties and application requirements. For example, adding nickel can increase the strength and toughness of the weld, while chromium enhances the corrosion resistance. Molybdenum and tungsten are often added to improve the high-temperature strength and creep resistance of the weld.
Iron-based alloy powders for PTAW are available in various particle sizes, typically ranging from a few micrometers to several hundred micrometers. The powder is usually fed into the plasma arc through a powder feeder, which ensures a controlled and consistent supply of powder during the welding process.
During PTAW, the powder is melted and deposited onto the workpiece, forming a weld bead. The high energy plasma arc provides the heat necessary to melt the powder and the base metal, creating a strong and durable weld joint.
Overall, iron-based alloy powder for plasma transfer arc welding offers excellent weldability, high mechanical properties, and resistance to corrosion and heat, making it suitable for a wide range of applications in industries such as aerospace, automotive, and power generation.
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