CuCrZr contact tip
The component of this contact tip is copper-chrome-zirconium (CuCrZr). The alloy elements chrome and zirconium are very hard and ensure high thermal resistance. The current transfer is a little less good, but this is not a noticeable problem for most processes. With a Vickers hardness of approx. 168 HV and a temperature resistance of approx. 500 °C, this contact tip material type is practically the standard. A high hardness combined with a high thermal load capacity means a low degree of wear with a correspondingly high process load.
If welding is carried out with a high-amperage arc or in the area of the spray arc, the contact tip is so heavily loaded that the thermal load capacity of the E-Cu contact tip is quickly reached and can exceed it. The fact that the time has come is shown by the bluish-black tarnish of the copper material. If welding continues with excessive thermal stress, the copper material softens, the wire erodes into the hole – also known as an oval washout – and can get stuck. In such a case, only the replacement of the contact tip helps. Fortunately, this is only the case with CuCrZr material under extreme process loads.
Conclusion
Contact tips made of CuCrZr material are very suitable for welding processes in the medium to high ampere range. They offer good process properties with low wear.
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Description
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