Preheating txhais tau tias yog txheej txheem uas ua kom sov welding nyob rau hauv tag nrho los yog nyob rau hauv qhov chaw weld ua ntej welding. Cov khoom siv tshwj xeeb zoo rau vuam qib siab zog, hardening nyiam ntawm cov hlau, thermal conductivity, thickness loj weldments, thiab thaum lub ambient kub yog tsawg heev, vuam cheeb tsam feem ntau xav tau ...
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