| 摘要 |
A contact tip for arc welding is split into a tip main body (1) and a tip distal end portion (2), and is removably fitted by a screw method or a taper press-in method. The tip main body (1) is made of brass, copper, aluminum, chromium copper, zirconium copper, zirconium chromium copper or phosphor bronze, and the tip distal end portion (2) is made of copper, chromium copper, zirconium chromium copper, silver tungsten, copper tungsten, alumina dispersed copper, beryllium copper or nickel beryllium copper, in order to extend life of the contact tip and to reduce the total cost. In this instance, brass is a particularly suitable material for the tip main body, and chromium copper or zirconium chromium copper is a suitable material for the tip distal end portion (2). Of the wire passage of the tip main body (1), the passage diameter of at least the tip distal end portion side is within the range of 1.03 to 1.50 times the wire diameter, and the wire passage diameter of the tip distal end portion (2) is within the range of 1.03 to1.25 times the wire diameter. According to this arrangement, the wire can be smoothly inserted, electric current can be reliably supplied, and positioning error of arc welding can be prevented.
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