The original metal sheet has 15m in length. Both sides are welded by TIG and formed into a large tube.

Forming Process

After Forming

Loading onto a special carrying frame to transport from our factory in Kyoto→Heat Treatment→Acid Pickling→Assembling Plant besides Osaka Bay

Huge products of which sizes exceed the limitation of transformable sizes by traffic regulations, finished products will be directly shipped out from the bayside factory.

After vacuuming the expansion joints, and keep it 20 min. Then, spray He gas from outside to monitor the He gas leaks inside of expansion joints.

Loading the expansion joints on board at bayside factory.