| 摘要 |
<p>A contact tip (220) for a welding torch includes a refractory material reinforced copper composite including approximately 10 to 50% by volume of a refractory material and at least one of copper and a copper alloy. The refractory material is one of a metal and a ceramic material. The contact tip (220) may include an elongated, generally cylindrical body (240) having a front contact end (226), an opposite rear retaining end, and a passageway (230) extending from the rear retaining end to the front contact end (226). A portion (242) of the passageway (230) may be defined by the refractory material reinforced copper composite. The portion (242) may have a diameter that is approximately 3 to 8% larger than an outer diameter of a consumable electrode wire, and the portion may have a length of approximately 0.2 to 0.6 inches.</p> |
