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  1. Process Overview Flexible stainless steel corrugated tubes are widely used in HVAC, industrial gas systems, plumbing and mechanical equipment connections. Thanks to their thin-wall and flexible corrugated structure, they absorb vibration and fit complex installation layouts. However, traditional fusion welding and TIG welding easily cause common defects including tube burn-through, corrugation collapse, loss of flexibility and joint leakage, due to excessive heat input. Our professional brass brazing process solves these problems perfectly. Using dedicated brass welding wire for flexible stainless steel, we adopt low-temperature capillary brazing instead of high-temperature fusion welding. The process does not melt the stainless steel base material, preserves the original flexibility of the tube, and delivers strong, leak-proof joints with excellent consistency and cost efficiency.   2. Core Advantages Our optimized brazing process is specially developed for thin-wall flexible stainless tubes, with four key technical and commercial benefits: • No Deformation, Full Flexibility Retention Brazing is performed at a low temperature, far below the melting point of stainless steel. Heat is strictly limited to the sleeve joint area without heating the corrugated flexible section. This completely avoids softening, collapsing or structural damage, ensuring the tubes retain full bending and vibration compensation performance after welding. • Superior Sealing Performance We control precise assembly clearance to enable full capillary penetration of the brazing material. The filler metal uniformly fills the entire joint gap to form a dense, void-free brazed fillet. No porosity, no cold joints, and zero leakage risk for long-term operation. • Excellent Cost Advantage Under High Copper Price Conditions With continuous high copper and silver material prices worldwide, traditional silver brazing greatly increases production costs and compresses profit margins. Our dedicated brass welding wire provides stable and reliable joint quality equivalent to standard silver brazing in normal working conditions, while reducing welding material costs by 30%–60%. It is the most cost-effective mass production solution for the current high raw material price environment. • High Stability & High Yield Rate We implement a standardized full-process workflow including surface polishing, precise flux application, controlled heating and professional post-wash treatment. The optimized low-heat welding method eliminates burn-through and deformation issues. The finished product yield rate stably reaches over 99%.   3. Practical Project Case Project Background A professional HVAC equipment manufacturer produces flexible stainless steel piping systems for commercial central air conditioning. The product adopts 0.3–0.5 mm thin-wall 304 stainless corrugated tubes, which re...

  As global industries move toward greener manufacturing, carbon emissions have become an important factor in supplier selection. From HVAC systems and refrigeration equipment to automotive components and industrial fabrication, manufacturers are increasingly looking for welding and brazing materials that not only deliver reliable performance but also contribute to sustainability goals. At XINXIN Welding Materials, we believe that strong joints and environmental responsibility can go hand in hand.   Why Carbon Footprint Matters in Brazing Materials Every product has a carbon footprint—the total greenhouse gas emissions generated during raw material extraction, production, packaging, and transportation. For brazing and welding materials, carbon emissions mainly come from: Metal refining and processing • Manufacturing operations • Energy consumption during production • Packaging materials • International transportation Reducing emissions throughout these stages helps manufacturers build more sustainable supply chains and meet growing environmental requirements.   Efficient Production, Reduced Environmental Impact At XINXIN Welding Materials, we continuously improve production efficiency to reduce unnecessary energy consumption and material waste. Through optimized manufacturing processes, strict quality control, and efficient resource utilization, we strive to: • Reduce raw material waste • Improve production efficiency • Lower energy consumption per unit produced • Extend product service life through consistent quality A high-quality brazing rod not only creates stronger joints but also reduces rework, rejects, and material waste during manufacturing.   Longer Service Life Means Lower Lifecycle Emissions The environmental impact of a brazed joint is not limited to production. Reliable brazing materials help equipment operate longer and require fewer repairs. This reduces replacement frequency, maintenance costs, and the associated carbon emissions over the product's entire lifecycle. Our products—including: • Brass Brazing Rods (RBCuZn-A, RBCuZn-C) • Copper Phosphorus Brazing Alloys (BCuP Series) • Silver Brazing Alloys • Aluminum Brazing Fluxes • Copper Brazing Fluxes Are designed to provide stable performance and durable connections across HVAC, refrigeration, automotive, and industrial applications.   Supporting Sustainable HVAC and Refrigeration Industries Modern HVAC and refrigeration systems play an important role in global energy efficiency. High-quality brazing materials contribute to: • Leak-free connections • Improved system reliability • Higher operating efficiency • Reduced refrigerant loss • Lower energy consumption These benefits help equipment manufacturers achieve both performance and sustainability objectives.   Building a Greener Future Together Sustainability is becoming a shared responsibility acro...

  Safety is the foundation of production. As the Work Safety Month arrives, all staff of Xinxin Welding Materials keep safety firmly in mind and uphold the concept of Everyone values safety, everyone can respond to emergencies. Welding material production features complex processes and dense equipment. We standardize operating procedures and labor protection wearing, inspect hidden dangers in workshops, equipment and warehouses strictly, and put an end to illegal operations. Safety is no trivial matter, and everyone bears responsibility. All employees keep to the safety bottom line, start from themselves and their own posts, integrate safety into daily work, and implement responsibilities in every detail. Xinxin Welding Materials safeguards production with safety, protects factory security with responsibility, builds a solid line of work safety, and boosts the stable and long-term development of the enterprise  

  If you run an aluminum bangle or aluminum jewelry manufacturing workshop, you must have struggled with common welding headaches: cold joints, cracked weld seams, black oxidized welding spots and high product scrap rates. These problems usually come from low-performance brazing flux that cannot clear aluminum oxide thoroughly. Lion Brand CJ401 aluminum brazing flux is tailor-made for aluminum jewelry production. Featuring superior oxide removal capability, it quickly strips off stubborn alumina layers while brazing. The flux spreads uniformly under proper working temperature, leaves very little slag after welding and forms bright, clean and ultra-solid weld joints. Whether you are doing small-batch handmade craftsmanship or large-scale automated assembly line production for aluminum bangles, CJ401 works steadily without corroding base aluminum materials. Thanks to its stable welding performance, lots of jewelry manufacturers worldwide have switched to our flux to slash waste and improve finished product yield. Cost-effective with consistent batch quality, Lion CJ401 has gained wide recognition among jewelry factories globally. Feel free to contact us to get free samples for your onsite welding test.          

  “We Thought the Problem Was the Aluminum Rod…” Last year, one of our customers in Southeast Asia contacted XINXIN WELDING about a problem in aluminum brazing. They were producing aluminum heat exchangers for air conditioning systems. At first, the factory believed the issue came from the aluminum brazing rod itself. The workers complained that: ▶ the filler metal was difficult to flow, ▶ some joints looked dry, ▶ and after pressure testing, small leakage problems appeared repeatedly. To solve the problem, they tried: ▶ changing the flame temperature, ▶ replacing different aluminum rods, ▶ increasing heating time. But nothing really improved. In fact, overheating made the aluminum parts deform even more.   After discussing the production process with their engineers, we discovered one important detail: they were using a very low-quality aluminum brazing flux with unstable performance. The flux could not effectively remove the oxide layer from the aluminum surface. This is actually a very common problem in aluminum brazing. Unlike copper, aluminum oxidizes extremely fast once exposed to air. Even if the surface looks clean, a thin oxide layer already exists. Without a stable brazing flux, the filler metal simply cannot wet the base material properly.   We suggested they test XINXIN WELDING QJ201 Aluminum Brazing Flux. The customer first used it on a small batch production line. The feedback came back surprisingly fast. Their workshop supervisor said: “The first thing we noticed was the filler metal started flowing much faster. The brazing area looked cleaner, and workers no longer needed to repeatedly heat the same joint.” A week later, the factory reported another improvement: the leakage rate during pressure testing dropped significantly. For them, this was more important than anything else. Because in HVAC manufacturing, every leakage problem means: ▶ rework, ▶ wasted material, ▶ delayed delivery, ▶ and unhappy customers. After two months, the customer fully switched to QJ201 Aluminum Brazing Flux from XINXIN WELDING.   Today, they mainly use it for: ▶ aluminum heat exchangers, ▶ aluminum tube connections, ▶ automotive radiator parts, ▶ and refrigeration system components. Many people think brazing flux is only a “supporting material.” But experienced factories know: sometimes the success of the entire brazing process depends on the flux itself.   At XINXIN WELDING, we focus on helping customers achieve more stable production, cleaner brazing results, and lower defect rates — not just selling materials.  

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!