Preheating (preheating) zvinoreva nzira yekupisa mawelds ari akazara kana munzvimbo dze weld before welding.Kunyanya zvinhu zvakanaka zvewelding yakakwira simba nhanho, kuomesa maitiro esimbi, kupisa conductivity, ukobvu hombe weldments, uye kana ambient tembiricha yakadzikira, welding zone inowanzoda ...
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