Current-insulating coatings for Current Contact Tips

As current insulating purposes we offer two different coatings.

Short-circuits are avoided by both coatings, which develop again and again during the contact of the torch with the work piece. The usual resulting copper inclusions in the welding seam which are shown on any X-Ray or ultrasonic test and usually have to be repaired are therefore avoidable.

Since the ceramic coating works like a thermal shield, the service life of the Current Contact Tips can be extended, too.

spa DHCA Current Contact Tips

SPA DHCA Current Contact Tips are the innovative alternative to conventional Current Contact Tips. DHCA is a dispersion-hardened copper material. In the production the crude-copper powder with alloying additions and dispersoids will be grinded intensively. All components are distributed homogeneously and out of it results in a material with high strenght, heat-resistance and good electrical conductivity.

The advantages at a glance:

• less wear
• excellent temperature characteristics
• higher service life compared to CuCrZr Current Contact Tips
• increased productivity because of less downtime. (less tip change in the application of automat robots)

Manufacturing Technique

DHCA is a dispersion-hardened copper material and is characterised by high abrasion resistance and in particular high heat resistance. The production of this innovative material takes place powder metallurgical through reaction milling. The crude copper powder with alloying additions and dispersoids will grind intensively.

Superfine, thermally sturdy oxides and carbides are formed and distributed by repeating cutting up and cold welding processes as dispersoids in the copper matrix. A copper composite material with homogeneous distribution of the different components results in a singular combination of high firmness, heat resistance and abrasion resistance as well as good electrical and thermal conductivity.

Hardness loss after 1 h temperature load

This has an effect in particular welding applications. At high temperatures the electrodes are exposed to erosive wear and/or mechanical load.

Do you have any questions concerning our Current Contact Tips? Then contact us – we would be happy to advise you!