Group 1 - The National Speed Skating Hall, known as the "Ice Ribbon," is the world's first venue to use carbon dioxide transcritical refrigeration technology, showcasing a perfect combination of ice and steel [1] - The key material connecting the venue's steel structure is a 1.2 mm diameter flux-cored welding wire supplied by General Welding Technology Co., Ltd. in Rizhao, Shandong [1] - This welding wire has been used in significant projects such as the Beijing Daxing International Airport dome, the Yellow River Grand Bridge, and the manufacturing of domestic aircraft carriers [1][6] Group 2 - General Welding produces 450,000 tons of welding materials annually, with flux-cored welding wire being a significant portion, enhancing weld strength and pressure resistance [3] - The company has developed a unique powder formula for the welding wire, achieving a balance between rigidity and flexibility through extensive experimentation [3][6] - The company operates a highly automated production facility, with 80% of the processes completed by robots, resulting in near-zero error rates and ensuring product consistency [1][8] Group 3 - The company is recognized as an "invisible champion" in large-scale national engineering projects, with its welding wire being crucial in aerospace, shipbuilding, and bridge construction [6] - Established less than six years ago, the company has achieved a "zero inventory" operation model, with products being ordered immediately after production [8] - Rizhao's Lanjun District is transforming from a steel production hub to a welding material and high-end equipment manufacturing center, supported by local steel resources [11]