Machining Processes Involved in Offshore Exploration Platform Derricks

As a critical load-bearing structure, offshore exploration platform derricks mainly use high-strength alloy steel (such as EH36/EH40). The machining process mainly includes: CNC plasma/flame cutting for blanking, large boring and milling machine processing of connection hole systems, beveling, as well as welding (mainly using submerged arc welding and gas shielded welding) and post-weld heat treatment. The core of the processing lies in ensuring structural strength and dimensional accuracy.

Precautions include: materials must be certified and traceable; welding processes must be strictly qualified, and welders must be certified; 100% non-destructive testing (UT/RT) must be performed on all critical welds; processing deformation must be strictly controlled; special tooling support is required for the processing of large components; attention should be paid to the accuracy and surface treatment of key connection parts such as flanges and hole systems; and strict anti-corrosion coating processes must be implemented.