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滲鋁NM500耐磨鋼管焊接的問題

更新時間:2020-03-24 13:36點擊次數:
廉價的碳鋼材料,經表層滲鋁后,即具備耐磨、耐蝕、耐氧化特性。具有較大經濟價值。但滲鋁鋼的焊接難題,阻礙了滲鋁鋼的推廣應用。滲鋁鋼的母材一般為10#、20#的低碳鋼,表面滲鋁后,表面有0.1-0.3mm厚的滲鋁層,該層的Al含量為20%-40%。滲鋁層硬度接近馬氏體鋼,耐蝕性與1Cr18Ni9Ti不銹鋼相當,耐氧化性優于不銹鋼。滲鋁NM500耐磨鋼管焊接的問題,主要是指熔合線如何恢復滲鋁層的特性。

      1、堆焊
      耐磨復合鋼管在滲鋁前,先在其端頭用不銹鋼焊條A312進行堆焊,然后再進行滲鋁。這樣,在耐磨復合鋼管對接焊時就變成了不銹鋼之間的焊接,不會破壞原滲鋁層。當耐磨復合鋼管壁厚≥12mm,宜采用堆焊法。操作方法:在焊接之前先開坡口,在原管端頭內外表面開出初坡口,再用A312焊條堆焊,最后形成終坡口。將加工了坡口的耐磨復合鋼管進行滲鋁,之后需用砂紙把坡口處的污物、雜物磨掉后,進行焊接。

      2、釬焊
      當耐磨復合鋼管壁厚<12mm,宜采用釬焊。當兩支耐磨復合鋼管對接焊時,利用焊接余熱把低熔點的釬焊料熔化,熔化后的釬焊料粘附并滲透到焊件的內外焊縫上。這些釬焊料是耐蝕耐氧化材料,而性能優于滲鋁鋼,熔合線的性能具有釬焊材料的特性。焊條為A312。施焊時,雖然熔合線的滲鋁層被破壞,但是此處又有釬焊材料粘上去,同時在滲金屬,焊縫區同樣被耐蝕耐磨氧化物覆蓋,性能優良。
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