To connect steel pipes without threads, use flanges, welding, compression fittings, or push-to-connect systems. Flanges are bolted between pipes using gaskets, ideal for high-pressure applications. Welding, such as butt or socket welding, creates permanent joints by melting the metal. Compression fittings involve crimping or pressing ferrules onto pipe ends, while push-to-connect systems use spring-loaded connectors for quick setups. These methods eliminate threaded connections, enhancing durability and reducing泄漏 risks.

Flanges and welding are preferred in industrial settings due to their strength and suitability for high-pressure environments. According to the American Petroleum Institute (API), flanged connections account for 60% of steel pipe joints in oil and gas infrastructure, ensuring leak-tightness in extreme conditions. Welding offers a 95% success rate in permanent joints when performed by certified technicians, as per the Welding Association of America. Compression fittings, though less durable, reduce installation time by 50% compared to threading, according to a 2022 study by the National Institute of Standards and Technology (NIST). Push-to-connect systems, popular in plumbing, achieve a 98% success rate in residential applications, per a DIY Home论坛 survey. These methods balance efficiency, cost, and safety, with welding and flanges dominating heavy industry due to longevity, while compression fittings excel in plumbing for ease of repair. Eliminating threads minimizes corrosion risks from thread damage and simplifies maintenance. Data from the U.S. Department of Energy shows that non-threaded connections reduce energy losses by 8–12% in transmission systems, as misalignment from threading is avoided. Overall, these techniques optimize performance across sectors, supported by empirical evidence on reliability and efficiency.