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. Fe Alloy Powder,Stainless Powder,High Temperature Powder,Iron Base Pta Welding Powder Luoyang Golden Egret Geotools Co., Ltd. , https://www.xtclasercladding.com
The EPA had proposed amendments to the Glyphosate licensing limits on the June 7, 2006 Federal Register (71 FR 32899) (FRL-8062-7), including harmonization with certain licensing limits of CODEX. The EPA had received comments from Monsanto that the company agreed to change the proposed residue limits for glyphosate (Glyphosate). However, Monsanto also informed the EPA that it has recently made changes to the CODEX Glyphosate MRLs identified in July 2006. Monsanto provided a detailed list suggesting that Glyphosate's licensing limits be modified to better align with CODEX's new MRLs.
In response to this comment, EPA agreed to consider Monsanto's proposed coordination with CODEX in future proposals. The EPA now determines that the following commodity limits can be coordinated with CODEX's MRLs: 15 grain crops, cottonseeds, corn, rapeseed, canola, and liver and kidneys from cattle, goats, pigs, horses, and sheep.
The current Glyphosate residue limit in the "Liquor Crop 15 Group" is 0.1ppm, but does not include the main grain crops such as barley, field corn, sorghum, oats, and wheat, but also includes secondary grain crops. , popcorn corn, rice, rye, sweet corn, Mexican oysters, black wheat, and wild rice. The existing licensing limits are: Barley Valley: (20 ppm); Field Corn Valley (1.0 ppm); Sorghum Valley (15 ppm); Oats Valley (20 ppm) and Wheat Valley (5.0 ppm).
The EPA intends to amend the permissible limits for glyphosate in/from the following crops: "15 grain crops, excluding barley, field corn, sorghum, oats and wheat" were replaced by "15 grain crops, excluding fields. "Maize, popcorn, corn, rice, sweet corn and wild rice", the license limit is increased to 30 ppm; the following crop clearance limit is revoked: Barley Valley: 20 ppm; Oats Valley: 20 ppm; Sorghum Valley: 15 ppm; Wheat Valley : 5 ppm; wheat sub-powder: 20 ppm; dwarf wheat: 20 ppm; and wheat bran: 20 ppm;, which provides the following crop allowances: sweet corn valley: 0.1 ppm; popcorn corn valley: 0.1 ppm; rice: 0.1 Ppm; wild rice: 0.1 ppm; to increase the corn corn limit from 1 ppm to 5 ppm.
The EPA intends to raise the permissible limits for glyphosate in/from the following crops: undefiberized cottonseeds: 35 ppm-40 ppm; rapeseeds: 10 ppm-20 ppm; canola seedlings: 10 ppm-20 ppm; Rapeseed flour: 15 ppm, canola seed powder: 15 ppm.
EPA proposes to withdraw the permissible limits for glyphosate in/from the following items: bovine kidney: 4.0 ppm; bovine liver: 0.5 ppm; goat kidney: 4.0 ppm; goat liver: 0.5 ppm; horse kidney: 4.0 ppm; horse liver : 0.5 ppm; sheep kidney: 4.0 ppm; sheep liver: 0.5 ppm; porcine kidney: 4.0 ppm; porcine liver: 0.5 ppm; provisions for the following items: 5 ppm; beef by-products: 5 ppm; mutton by-products: 5 ppm; Horse meat by-products: 5 ppm; Goat meat by-products: Pork by-products: 5 ppm; EPA proposes to correct errors by removing sunflower seeds: 0.1 ppm, safflower: 0.1 ppm limit, legume vegetable 6 groups, excluding soybeans: 0.1 ppm; The modified sunflower-related term “sunflower species†is 85 ppm, and the red flower is changed to “red flower speciesâ€: 85 ppm.
Whether or not the proposed regulation will adopt coordinated measures in the future is not yet certain.
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.
U.S. Proposed Glyphosate Residue Licensing Regulations
On May 28, 2008, the U.S. EPA announced the development of the Glyphosate Residue Licensing Limits for the following commodities.