Patent ID: 8455786

Claim:
An electrode head of the plasma cutting machine comprising a sheath ( 1 ), a bearing means ( 2 ), and an electrode core ( 3 ), characterized in that: the electrode head further comprises a first brazing means ( 4 ) and a second brazing means ( 5 ), wherein the electrode head is assembled by using brazing and the second brazing means ( 5 ) consists of copper and silver; the sheath ( 1 ) is hollow inside and comprises a first end ( 11 ) and a second end ( 12 ), wherein a first flange ( 13 ) is provided and extends radially from the first end ( 11 ) into the interior of the sheath ( 1 ); the bearing means ( 2 ) is rod-shaped and comprises a third end ( 21 ) and a fourth end ( 22 ), wherein a second flange ( 23 ) is provided to be fixed to the first flange ( 13 ) of the sheath ( 1 ) via the first brazing means ( 4 ), and extends radially outward from the third end ( 21 ), and, a protrusion portion ( 24 ) is formed on the fourth end ( 22 ) and protrudes toward the interior of the sheath ( 1 ), a recess portion ( 25 ) is defined in the axial interior of the protrusion portion ( 24 ) with an opening on the third end ( 21 ), and the electrode core ( 3 ) is disposed in the recess portion ( 25 ) and is fixed to the bearing means ( 2 ) via the second brazing means ( 5 ), wherein the electrode core ( 3 ) is made of hafnium.