How Does the Hull Block-Joining Process Work in Shipbuilding?

In new-build projects, the hull is assembled from steel blocks fabricated separately in the workshop. Each block goes through pre-fabrication — cutting and welding — before being joined in the block-erection stage.

Block joining demands millimeter-level precision; alignment tolerances between blocks directly affect the structural integrity of the vessel. Every joint is checked with ultrasonic or radiographic testing after welding.

Large blocks are typically moved from the hangar to the dock area using cranes and self-propelled modular transporters (SPMTs). Site coordination, safety, and timing are critical at this stage.

At NFT Group, we manage new-build projects end-to-end — from pre-fabrication through block erection and outfitting — keeping engineering oversight on-site at every stage.