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J421 is a non-alloy steel electrode with a rutile coating, which is suitable for all-position welding, AC and DC dual purpose. The operation performance is good, the slag removal is good, the spatter is small, and the arc is easy to strike.
Welded mild steel structure, especially suitable for intermittent welding of short welds of thin plate and small parts and cover welding requiring a smooth surface.
J506Fe is a non-alloy steel electrode, the coating type is alkaline + iron powder type, used for all-position welding, AC and DC reverse connection, excellent welding process performance, less spatter, easy slag removal, beautiful weld forming, deposited metal has excellent low temperature toughness and crack resistance.
It is used for the welding of important structures built of carbon steel or low-alloy steel and A, B, D, and E grade steel for ships, such as boilers, pressure vessels, bridges, pipelines, etc
E6010 is a high cellulose sodium type coating vertical downward welding electrode, with large arc blowing force, single-sided welding and double-sided forming, less slag, easy to remove, beautiful weld forming, fast weld speed, good mechanical properties of deposited metal, and excellent anti-porosity and crack resistance.
The special welding rod for pipe welding is used for the annular seam butting of various carbon steel pipes, and is also suitable for vertical downward welding of general carbon steel structures.
A102 is a stainless steel electrode of rutile coating type, the weld metal has good mechanical properties and intergranular corrosion resistance, and the weld crack resistance is better. AC and DC dual-use, the arc blowing force of the electrode is large, the comprehensive process performance of flat and vertical welding is excellent, especially the all-position welding performance is better, the weld forming is beautiful, the electrode coating is not easy to redden, and the coating strength is good.
It is used for welding 06Cr19Ni10 stainless steel structure.
A402 is a rutile coating type of Cr26Ni21 pure austenitic stainless steel electrode, the weld metal has excellent oxidation resistance under high temperature working conditions of 900 °C-1100 °C. AC and DC dual-purpose, with good welding process performance.
Welding of the same type of heat-resistant stainless steel for working at high temperatures. It is also used for the welding of chromium steel with high hardening properties such as (Cr5Mo, Cr9Mo, Cr13, Cr28, etc.) and dissimilar steel.
A202 is a rutile coating type of stainless steel electrode, the weld metal has good corrosion resistance, heat resistance and crack resistance, especially anti-chloride ion pitting corrosion, AC and DC dual-purpose, excellent welding process performance, suitable for all-position welding.
It is used for welding 06Cr17Ni12Mo2 stainless steel equipment that works in organic and inorganic acid (non-oxidizing acid) media, and can also be used for welding high-chromium steel or dissimilar steel that cannot be heat treated after welding.
ER50-6 is suitable for construction machinery, automotive, steel structures, pipelines, containers, and arc welding robots.
Compliant with standards: GB/T 8110:ER50-6, AWS A5.18:ER70S-6, JIS Z3312:YGW12.
ER50-G is suitable for single-pass and multiple-pass welding, capable of welding thin sheets, high-speed welding, and general structure welding.
Compliant with standards: GB/T 8110:ER50-G, AWS A5.18:ER70S-G, JIS Z3312:YGW15.
ER50-3 is suitable for construction machinery, automotive, steel structures, pipelines, containers, boilers, pressure vessels, and arc welding robots.
Compliant with standards: GB/T 8110:ER50-3, AWS A5.18:ER70S-3, JIS Z3312:YGW16.
A second level professor and doctoral supervisor at Wuhan University of Science and Technology, has developed a series of welding materials that can be applied to LNG high manganese austenitic low-temperature steel (-196 ℃). She has presided over national natural science foundation projects and multiple enterprise technology cooperation projects, published more than 60 academic papers, and was included in more than 30 SCI and EI journals. She has also been granted more than 10 invention patents.
The company boasts a team of R&D and application professionals with extensive technical experience. We continuously intensify our R&D efforts, adjust product structures, and enrich product diversification to provide high-quality products and comprehensive solutions to customers both domestically and internationally.
Bocast Welding Technology (Jiangsu) Co., Ltd. is located in the economically developed Yangtze River Delta region. We are a comprehensive enterprise specializing in the research and development, production, and sales of various welding materials. We are the research and development transformation base of welding materials of Wuhan University of Science and Technology. The main products include: special stainless steel welding rods, special low-temperature steel welding rods, special nickel and nickel based welding rods; Special welding wires and fluxes, etc. The high manganese austenitic low temperature steel welding rod has filled the gap in the industrial development of key materials in China, and is used in LNG storage tanks, pressure vessels ,etc.
Bocast Welding Technology (Jiangsu) Co., Ltd. is one of the major domestic manufacturers of special welding materials. The company operates basic special welding materials and also has the leading domestic ultra-low temperature high manganese austenitic stainless steel and nickel-based welding materials, which are widely used in LNG natural gas storage tanks, pressure vessels, offshore platforms, petrochemicals, military industry, nuclear power and other industries.
August 6,
2024From the welding process to compare, acidic electrode arc soft, spatter small, slag mobility and coverage are good, therefore, the weld appearance is beautiful, weld wave is fine, forming smooth: alkaline electrode arc is not stable enough, slag coverage is poor, the weld shape of the raised, and weld appearance of the ripples of roughness, but in the upward vertical welding and elevation welding is easy to operate.
Acidic welding rod contains more acidic oxides in the flux skin, oxidation is stronger, so in the welding process to make the alloying elements burn more, at the same time, due to the weld metal in the hydrogen and oxygen content is more, and thus the molten metal plasticity, toughness is lower. Typical acidic welding rods are E6013, E7016, E8016, E9016 and so on.
The flux skin of alkaline welding rod contains a large amount of alkaline oxides, and there are more iron alloys as deoxidising and alloying agents, so the flux skin has sufficient deoxidising ability. Furthermore, alkaline electrodes mainly rely on the decomposition of carbon dioxide from carbonates such as marble as a protective gas, compared with acidic electrodes, the partial pressure of hydrogen in the arc column atmosphere is lower, and fluorite in the calcium fluoride at high temperatures and hydrogen combined with hydrogen to form hydrogen fluoride (HF), which reduces the amount of hydrogen in the weld, alkaline electrodes are also known as low-hydrogen type electrodes. When welding with alkaline electrodes, the weld metal has higher plasticity and impact toughness due to the lower oxygen and hydrogen content and fewer non-metallic inclusions. Typical alkaline electrodes are E7015, E8015, E9015 and so on.
As the national standard GB/T 3965-2012 "Method for the determination of diffusible hydrogen in molten metal", AWS A4.3-93 (R2006) "Standard Method for the Determination of Diffusible Hydrogen Content in Electric Arc Weld Seam Metal of Maraging, Bainite and Ferrite Steels", ISO 3690:2018 "Welding and Related Processes -Determination of Hydrogen Content in Electric Arc Welding Weld Metal‖, and JIS Z 3118:2007 -Method for Measuring Diffusible Hydrogen Content in Steel Welds‖ [1-3] require that the diffusible hydrogen content of alkaline electrodes is ≤15 ml, while that of acidic ones can be up to 15 ml or more per 100 g of the molten metal when determined in the laboratory by the mercury method or gas chromatography method.
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