Abstract: A soldered bar stock has a handle blank with a first through hole, and has a head blank having a soldered portion protruding into and soldered in the first through hole. The soldered bar stock is machined to form a soldered machining tool. With the first through hole formed in the handle blank, the head blank can be firmly soldered to the handle blank. When replacing the head blank with a new one, solder in the first through hole can be completely cleaned. Moreover, when using the soldered machining tool, a cooling liquid can be injected into the first through hole to cool down the soldered machining tool.

Abstract: A combination-type machining tool has a handle segment and a head segment. The handle segment is made of stainless steel or carbon steel and has a clamping handle and a body. The body is axially formed on and protrudes from a front end of the clamping handle and has a protruding rod axially formed on and protruding from a front side of the body. The head segment is made of tungsten steel, is mounted around the protruding rod and has a through hole axially formed through a front side and a rear side of the head segment, and an inner peripheral surface of the through hole is securely mounted around the protruding rod to enable the rear side of the head-segment to abut against the front side of the body.