Hot compression bonding helps achieve seamless CLAM steel joint

China low activation martensitic (CLAM) steel, as a typical reduced activation ferritic/martensitic steel, is the main candidate structural material for fusion reactors due to its low activation, high mechanical properties, irradiation resistance and corrosion resistance. However, weld uniformity is difficult to achieve with a conventional welding method, which tends to coarsen the martensitic slat, and the performance of the joints is usually lower than that of the base material.