低溫鋼的焊接操作方法
乙烯蒸餾塔(ta)縱(zong)縫(feng)埋弧(hu)焊(han)(han)(han):乙烯蒸餾塔(ta)材質為低溫(wen)鋼(09Mn2V正火(huo)),板(ban)厚為12mm,工(gong)作(zuo)溫(wen)度-70℃;工(gong)作(zuo)壓力0.6MPa.采(cai)用埋弧(hu)焊(han)(han)(han),焊(han)(han)(han)接(jie)工(gong)藝為如下。1.焊(han)(han)(han)接(jie)材料(liao) 焊(han)(han)(han)絲為H08Mn2MoVA,焊(han)(han)(han)劑為HJ250,使用前(qian)300~350℃烘干(gan),保溫(wen)2h。2.焊(han)(han)(han)前(qian)準(zhun)備&n...