Laser welding of copper and copper alloys

Baker in njegove zlitine so v industriji, predvsem avtomobilski, ene izmed najbolj uporabljenih elementov. Njegovo pomembnost nam pove že dejstvo, da se po njem imenuje obdobje prazgodovine. Izziv pri varjenju bakra (npr. pri varjenju z IR ali zeleno svetlobo) je v tem, da ima visoko reflektivnost, visoko termično prevodnost, ter nizko prevodnost. Zaradi tega ga je izredno težko variti že z laserji, saj baker potrebuje močan vir toplote. V zaključni nalogi smo pregledati najnovejšo znanstveno literaturo na področju varjenja in varivosti bakra in njegovih zlitin. Opisani so vplivi laserske svetlobe na varivost in njeno absorptivnost, vpliv zaščitnih plinov na varivost in metalurške lastnosti zvarnega spoja. Ugotovili smo, da je za varjenje bakra in bakrovih zlitin primerno variti z kombinacijo IR in zelene svetlobe ali preprosto kar z zeleno svetlobo. Najprimernejša svetloba za varjenje bakra je modra, saj z njo dosežemo največjo absorpcijo energijeCopper and its alloys are in industry, especially automotive, one of the most used elements. The fact that we have called a period of prehistory after it, points its importance. The problems of copper welding are their high reflectivity, high thermal conductivity, and low absorptivity. This makes it extremely difficult to weld even with lasers, as copper needs a more powerful heat source. The purpose of this research is to review the latest scientific literature on copper. A review of laser light on the weldability of copper and copper alloy is done, as well as the influence of shielding gases on copper welding, and metallurgical effects of the weld is discussed. We found that welding copper and copper alloys is appropriate to be welded with a combination of IR and green light or simply with green light. The most appropriate light for copper welding is blue. It has the highest level of absorptivity