Umthombo kagesi ophemba futhi ugcine i-arc kagesi phakathi kwe-electrode nengcezu esisebenza kuyo, kuncibilike kokubili ukuze insimbi ihlangane ibe yinto eyodwa lapho iphola. Imishini yangempela yehluka ngohlobo lwe-arc eluqhubayo — induku embozwe, ucingo olungenayo ngokuqhubekayo, noma i-electrode ye-tungsten esetshenziswa nenduku yokugcwalisa eyehlukene — nangamandla kagesi engawamela nangesikhathi engawamela ngaso.