| CPC H05H 1/28 (2013.01) [B23K 9/285 (2013.01); B23K 10/00 (2013.01)] | 7 Claims |
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1. A plasma torch comprising:
an electrode including
an internal passage that extends in an axial direction of the electrode,
a tip portion that closes the internal passage,
a convex portion including a root portion connected to an inner surface of the tip portion, the convex portion protruding from the inner surface of the tip portion, and
an electrode insert at least partially arranged in the convex portion;
a center pipe at least partially arranged in the internal passage of the electrode, the center pipe including
a first pipe end that faces the inner surface of the tip portion in the axial direction, and
a second pipe end located opposite to the first pipe end; and
a coolant passage including
a first passage arranged in the center pipe,
a second passage arranged between an inner surface of the center pipe and the convex portion,
a third passage arranged between the first pipe end and the inner surface of the tip portion, and
a fourth passage arranged between an outer surface of the center pipe and an inner surface of the electrode
a coolant flowing from the first passage through the second passage and the third passage to the fourth passage,
at least a part of the convex portion being arranged in the center pipe,
the inner surface of the center pipe including a first inclined surface having a diameter that decreases toward a distal direction, the distal direction being a direction extending from the second pipe end to the first pipe end,
the first inclined surface extending toward the root portion of the convex portion, and
the inner surface of the center pipe further including a second inclined surface extending along a direction opposite to the distal direction with respect to the first inclined surface, a diameter of the second inclined surface increasing toward the distal direction.
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