Preheating na nufin wani tsari da ke dumama welding gaba ɗaya ko a wuraren walda kafin walda. Musamman mai kyau abu don walda babban ƙarfin matakin, ƙarfin ƙarfin ƙarfe, ƙarfin zafin jiki, kauri ya fi girma weldments, kuma lokacin da yanayin zafi ya yi ƙasa da ƙasa, yankin walda sau da yawa yana buƙatar ...
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