To quickly connect steel pipes, use pre-threaded couplings with hexagonal nuts or焊接 (weld) using a high-quality arc焊机 (welding machine). For high-pressure systems, select seamless butt welds with post-weld heat treatment. Threading requires precise gauge verification, while welding demands certified operators and NDT (non-destructive testing) for quality assurance.

The efficiency of steel pipe connections depends on method, material, and application. Threading with couplings reduces installation time by 30% compared to traditional flange bolts, as reported by the American Petroleum Institute (API) in 2022. This method eliminates the need for welding equipment and skilled labor, making it ideal for low-to-moderate pressure systems. However, welding provides superior tensile strength (up to 80,000 psi for ASTM A106 steel) and permanence, critical for high-pressure pipelines. Data from the Steel Pipe Institute (SPI) shows that properly executed welded joints have a 98% reliability rate, outperforming threaded connections (92% reliability) in cyclic load environments. Flange connections, though slower to assemble, are preferred for temperatures above 400°F due to their ability to handle thermal expansion. The choice also hinges on cost: threading costs $15–$25 per linear foot, while welding ranges $20–$50 per joint, per 2023 industry benchmarks. Proper technique and adherence to standards like ASME B16.9 and API 1104 ensure durability and compliance.