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LME Copper Price Surges Sharply Above $13,900: Tight Supply-Demand Drives a New Round of Price Hikes   Global non-ferrous metals rebounded strongly, with LME copper surging sharply overnight. The price broke through recent consolidation, opening a new upward trend for the global copper market. This rally is purely driven by LME copper futures, with all analysis focusing on LME 3-month copper futures short-term quotes (excluding spot and domestic market data). Overnight, LME 3-month copper futures surged $345/ton, up 2.56%, closing at $13,920/ton and breaking the key $13,900 threshold to hit a new yearly high. Fueled by continuous capital inflows, the price trended upward without notable intraday pullbacks. The short-term bullish trend is firmly confirmed, ending the earlier range- bound consolidation and launching a strong unilateral uptrend. This sharp LME copper surge is not a sentiment-driven spike, but a fundamental rally backed by three core drivers: tightening supply, robust end-user demand, and persistent low inventories, supporting a sustainable uptrend.   01 Widening Mine Supply Deficit Leads to Structural Global Shortage Supply-side disruptions are the key catalyst for the price rally. Severe infrastructure damage from last year’s mudslide has delayed the full production resumption of Grasberg Mine, the world’s second-largest copper mine, until early 2028. This prolonged delay has completely dispelled market expectations of easing global copper supply. Global sulfur shortages and geopolitical tensions have further constrained smelting output, creating bottlenecks for refined copper production. Copper concentrate processing fees have dropped to a nearly 20-year low, signaling extreme global copper resource tightness and locking in a long-term structural supply deficit.   02 Booming New Energy Demand Consolidates Price Upside The supply-demand gap keeps widening as shrinking supply meets expanding rigid demand. Copper’s dual applications in traditional manufacturing and high-growth emerging industries provide steady fundamental support for price increases. The new energy sector dominates demand growth. Rising penetration of new energy vehicles has boosted automotive copper consumption substantially. Meanwhile, booming AI infrastructure, data centers and high-end electronics have driven 、 strong demand for precision copper materials and heat-dissipation components. Recovering power and general manufacturing demand further underpins LME copper prices.   03 Sustained Inventory De-Depletion Maintains Tight Market Fundamentals LME registered warehouse inventories remain at seasonal historic lows, keeping overseas physical copper supply tight. The ultra-low inventory environment makes LME copper prices highly sensitive to incremental buying, easily triggering short squeeze rallies and accelerating the overnight price surge. Macro factors also bolster the uptrend. Dovish overseas monetary expectations a...

          In the wave of promoting the green transformation of manufacturing industry, Xinxin Welding Materials ushers in its "Green Production Month" in May. All employees integrate green development concepts into the whole process of welding material R&D, production and testing, contributing to the green transformation of the industry.           As a modern welding material enterprise, Xinxin has always taken green environmental protection as the core of high-quality development. Relying on the ISO9001 certification system, it is engaged in copper alloy welding wires and other products, serving multiple industries and actively responding to the national "dual carbon" goal.           With the theme of "Green Production, Energy Conservation and Low-Carbon Forward", this Green Production Month is an important practice of environmental protection and enterprise transformation. The company has carried out a series of practical actions to make the green concept take root.           In production, we focus on energy conservation, emission reduction and efficiency improvement, upgrade production equipment, promote environmental protection processes, and implement waste recycling to minimize resource waste.           In concept dissemination, we popularize environmental protection knowledge through various forms, organize special training and launch initiatives, guiding all employees to practice green production consciously.           Xinxin will take this event as an opportunity to solidify green production into a long-term mechanism, increase R&D investment, and strive to build a benchmark for green production in the welding material industry, contributing to the green development of manufacturing.

  The Canton Fair has come to a successful conclusion.   During the exhibition, we were delighted to meet and communicate with a great number of customers and partners from all over the world. Every visit, inquiry and in-depth discussion with you has been deeply appreciated.   As a professional manufacturer, TONGLING XINXIN WELDING MATERIALS CO., LTD. showcased our core products including high-quality brazing rods and brazing fluxat the fair. Your interest, recognition and warm support have given us strong encouragement.   We sincerely thank you for your trust and cooperation intention. We will keep providing reliable products, stable quality and professional service for global customers.   Looking forward to further business negotiations, long-term partnership and mutual success with all of you in the near future!  

  Dear Valued Customers and Partners, We sincerely invite you to visit TONGLING XINXIN WELDING MATERIALS CO., LTD at the 139th Canton Fair, one of the world’s most influential trade exhibitions.   Exhibition Details: Event: 139th Canton Fair Date: April 15th – April 19th, 2026 Booth Number: 9.1D30 Location: China Import and Export Fair Complex, Guangzhou, China   About Us TONGLING XINXIN WELDING MATERIALS CO., LTD is a professional manufacturer specializing in high-quality brazing and welding materials. With years of industry experience and continuous innovation, we are committed to providing reliable and cost-effective solutions to global customers.   Our Main Products At the exhibition, we will showcase a wide range of products, including: Brass Welding Rods (HS221 / RBCuZn Series) Silver Brazing Alloys Phosphorus Copper Brazing Rods (BCuP Series) Aluminum Welding Wires (ER4047, Flux-cored, etc.) Brazing Fluxes and Related Materials Our products are widely used in industries such as HVAC systems, refrigeration, automotive manufacturing, and general metal fabrication.   Why Visit Us Explore high-performance brazing solutions Discuss customized product development Evaluate stable quality and competitive pricing Build long-term cooperation with a trusted supplier We would be delighted to meet you in person, discuss your specific requirements, and explore potential cooperation opportunities. If you would like to schedule a meeting in advance, please feel free to contact us.   Contact Information: Company: TONGLING XINXIN WELDING MATERIALS CO., LTD WhatsApp: +86 13705623213 WeChat: 3486525212 We look forward to welcoming you at our booth 9.1D30!

        Evaluating RBCuZn-C (Low Fuming Bronze) requires a systematic approach based on four key dimensions:       chemical composition → melting behavior → mechanical properties → welding performance         This framework is widely used in both R&D and quality control for supplier qualification.       1. Chemical Composition (Primary Indicator)       RBCuZn-C is defined under AWS A5.8 standards. Composition stability directly determines product consistency.       Typical Composition Range:       Cu: 56–60%       Sn: 0.8–1.1%       Fe: 0.25–1.2%       Mn: 0.01–0.5%       Si: 0.04–0.15%       Zn: Balance       Evaluation Methods:       Review Mill Test Certificate (MTC / COA)       Perform Optical Emission Spectroscopy (OES)       Key Risks:       Low Sn → Reduced strength       Low Fe/Mn → Poor crack resistance       Excess Pb → Brittleness risk       Zn fluctuation → Unstable melting behavior       Conclusion: Composition consistency is the foundation of quality.         2. Melting Characteristics (Process Compatibility)       RBCuZn-C is designed for low-fuming brazing, requiring a controlled melting range.       Key Parameters:       Solidus: ~866°C       Liquidus: ~888°C       Working temperature: 910–955°C       High-Quality Performance:       Smooth and uniform melting       Stable fluidity (not overly runny)       Poor-Quality Indicators:       Wide melting range → Difficult operation       Excess spatter or fumes → Impurity issues       From an R&D perspective: A narrower melting range = better process stability.         3. Mechanical Properties (Post-Weld Performance)       Typical properties of high-quality RBCuZn-C:       Tensile Strength: ~60–70 ksi       Hardness: HB 80–100       Evaluation:       Tensile testing of weld metal       Metallographic analysis (grain uniformity)       Risks:       Low strength → Insufficient Sn or contamination       Brittleness → Excess Zn or impurities         4. Welding Performance (Most Practical Indicator)       This is the most direct way to assess product quality in real applications.       Good Performance:       Stable arc or flame   &nbs...

               Xinxin RBCuZn-C welding brazing rod is a high-quality low-fuming bronze brazing rod compliant with AWS A5.8 standard, specially designed for reliable joining of carbon steel, copper alloys, cast iron, nickel alloys and stainless steel. With excellent mechanical properties and stable welding performance, it is widely recognized in industrial welding scenarios. To maximize its brazing effect, matching it with Xinxin CJ301 flux is highly recommended, rather than using borax alone. Below is a detailed introduction to the product and the reasons for choosing CJ301 flux.          About Xinxin RBCuZn-C Welding Brazing Rod        Xinxin RBCuZn-C brazing rod is manufactured through strict and sophisticated production processes, ensuring consistent quality and reliable performance for every batch. The core production steps include:        • High-purity raw material selection and strict component testing to ensure no impurities and accurate composition;        • Precision batching and closed mixing to guarantee uniform distribution of all components;        • High-temperature smelting (1100-1200℃) and continuous casting to form dense, uniform billets;        • Multi-pass cold drawing and heat treatment (400-500℃) to reach standard size (1.6mm-5.0mm) and enhance ductility;        • Strict quality inspection and professional polishing, packaging, and warehousing to ensure product qualification and stability.          Why Choose Xinxin CJ301 Flux Instead of Borax Alone?        CJ301 flux is tailor-made to match Xinxin RBCuZn-C brazing rods, solving the limitations of using borax alone and ensuring optimal welding results. Its key advantages are as follows:        1. Perfect Compatibility with Brazing Temperature: RBCuZn-C brazing rods work at 850-1150℃. CJ301 flux has a melting point of 650℃, which melts in advance to exert its effect. Borax, with a melting point of 741℃, has poor fluidity below 800℃, failing to match the brazing rod’s melting rhythm and affecting efficiency.        2. Superior Deoxidation for Stable Welds: CJ301 is a scientific mixture of borax (25-35%) and boric acid (65-75%), with stronger deoxidation activity than pure borax. It efficiently removes oxide films on workpieces and brazing rods, avoiding defects like loose welds and sandholes caused by residual oxides from borax alone.        3. Safer Operation & Easier Post-Treatment: Pure borax produces toxic fumes at high temperatures and leaves insoluble glassy residues that corrode welds. CJ301 reduces toxic fumes and has easily cleanable residues, lowering post-welding difficulty and corrosion risks.        4. Versatile for Multi-Mate...

       Xinxin RBCuZn-C brazing rod is a high-quality low-fuming bronze brazing rod complying with AWS A5.8 standard, widely used for joining carbon steel, copper alloys, cast iron, nickel alloys and stainless steel. Its production follows strict quality control and sophisticated processes to ensure product quality.​        The production of Xinxin RBCuZn-C brazing rods includes 6 core steps, all strictly controlled to ensure stability and reliability.​        1. Raw Material Selection & Ingredient Inspection​        We select high-purity copper, zinc, tin, iron and other qualified raw materials. All raw materials are inspected for chemical composition and purity before production to ensure accuracy and no impurities.​        2. Precision Ingredient Mixing​        According to the RBCuZn-C standard formula, the inspected raw materials are accurately weighed and mixed in a closed environment to ensure uniform distribution of each component.​        3. Smelting & Continuous Casting​        The mixed raw materials are smelted at 1100-1200℃ to form uniform molten alloy, then continuously cast into billets with uniform cross-section and compact structure.​        4. Multi-pass Drawing & Heat Treatment​        The billets are cold-drawn to the standard size (1.6mm-5.0mm), then heat-treated at 400-500℃ to eliminate internal stress and improve ductility and toughness.​        5. Strict Quality Inspection​        Every batch of brazing rods is inspected, including chemical composition, size, surface quality and mechanical performance. Unqualified products are eliminated to ensure pass rate.​        6. Polishing, Packaging & Warehousing​        Qualified brazing rods are polished, then packaged with moisture-proof materials and stored in a dry, ventilated warehouse to ensure quality during transportation and storage.​        Xinxin adheres to "quality first, precision manufacturing", providing customers with high-quality, reliable RBCuZn-C brazing rods and professional technical support.

       Potassium Fluoride (KF) serves as one of the core active components inQJ102 silver brazing flux. Its functions can be broken down into keypoints based on the brazing mechanism:         1. Oxide Film Removal (Core Function)      During the brazing process, a stable oxide film forms on metal surfaces(especially copper, steel, and stainless steel), such as:      ▶CuO/Cu2O      ▶Fe2O3      ▶Cr2O3 (stainless steel)      Function of Potassium Fluoride:      ▶Reacts with metal oxides      ▶Generates soluble or fusible fluoride complexes      ▶Enables the oxide film to be "dissolved" or "peeled off"      Results:      ▶The solder can directly wet the metal surface      ▶Improves spreadability and bonding strength        2. Provision of Active Fluoride lons (F-)      At high temperatures, potassium fluoride:      ▶Partially dissociates and releases F- (fluoride ions)      ▶F- has extremely strong chemical activity      Function:      ▶Attacks stubborn oxide films (especially Cr2O3 in stainless steel)      ▶Improves the overall "activity level" of the flux      Essence:      ▶KF is the "active source" that determines the flux strength        3. Lowering Flux Melting Point (Synergistic Effect)      KF usually forms a eutectic system with the following components:      ▶KBF4 (Potassium Tetrafluoroborate)      ▶KAlF4/ K3AlF6 (Potassium Aluminate Fluoride)      Function:      ▶Lowers the overall melting temperature of the flux      ▶Activates the flux at a lower temperature      Effects:      ▶Wider brazing window      ▶More stable operation        4. Improving Wettability and Fluidity      The molten salt system formed with KF participation has:      ▶Good fluidity      ▶Low surface tension      Function:      ▶Helps solder spread      ▶Improves weld compactness        5. Risks and Control (Critical)      Although potassium fluoride is effective, it also brings problems:      Potential Risks:      ▶Generates fluoride residues (corrosive)      ▶May produce irritating gases at high temperatures      ▶Not suitable for the electronics industry (corrosion risk)      Industrial Control Methods:      ▶Proportion control with KBF4      ▶Addition of corrosion-inhibiting components.      ▶Optimization ...