Preheatingzvinoreva nzira yekupisa mawelds ari akazara kana munzvimbo dze weld before welding. Kunyanya zvinhu zvakanaka zvewelding high simba level, kuomesa maitiro esimbi, thermal conductivity, ukobvu hombe weldments, uye kana ambient tembiricha yakadzikira, welding zone inowanzoda butt kuti idziye isati yapisa.

Chinangwa chepreheating ndechekuderedza kukurumidza kwekutonhora kwemajoini akasungwa uye kupisa kwekutanga. Inogona kuonekwa kubva patafura, kudziya-kupisa kunogona kuderedza chiyero chekutonhora, asi haina kukanganisa nguva yekugara mukupisa kwepamusoro, iyo inonyanya kudiwa. Saka kana welding simbi ine kuomesa muitiro, kuderedza kutonhora mwero kunoderedza kuomarara maitiro makuru muitiro matanho, ndiko kudziyisa, pane kuwedzera simba kupinda.