| 摘要 |
Contact tips and diffusers, known as consumables, for MIG welding guns have a combined increase in mass over the prior art. The larger combined mass of the contact tips and diffusers, coupled with a three point thermal and electrical engagement, increase the life of the tips by a factor of between 2 and 6 times the prior art. The contact tip and diffuser engage; i) between a circumferential shoulder of the contact tip and the end of the circumferential opening of the lower interior chamber of the gas diffuser; ii) between the protrusion of the gas diffuser and a point on the circumferential channel of the contact tip; and iii) between a line on the contact tip opposite the protrusion of the gas diffuser and a line on an inner surface of the second interior chamber of the gas diffuser opposite the protrusion. A cam replaces prior art threads. The camming action is produced by a circumferential channel cut into the contact tip that intersects with a tangential flat in one end of the contact tip and which decreases in width and depth around to a point 180 DEG from the tangential flat. As the contact tip is rotated, the protrusion tracks within the channel to axially and radially wedge the contact tip within the diffuser.
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