• 中国科技核心期刊(中国科技论文统计源期刊)

保护气对304N不锈钢K-TIG焊接头组织性能的影响

柳阳, 王秋平

柳阳, 王秋平. 保护气对304N不锈钢K-TIG焊接头组织性能的影响[J]. 焊接, 2017, (9): 32-35.
引用本文: 柳阳, 王秋平. 保护气对304N不锈钢K-TIG焊接头组织性能的影响[J]. 焊接, 2017, (9): 32-35.
Liu Yang, Wang Qiuping. Influence of shielding gas on microstructure and properties of K-TIG welded 304N stainless steel[J]. WELDING & JOINING, 2017, (9): 32-35.
Citation: Liu Yang, Wang Qiuping. Influence of shielding gas on microstructure and properties of K-TIG welded 304N stainless steel[J]. WELDING & JOINING, 2017, (9): 32-35.

保护气对304N不锈钢K-TIG焊接头组织性能的影响

详细信息
    作者简介:

    柳阳,1988年出生,博士,工程师。主要从事不锈钢焊接工作,已发表论文10余篇。

  • 中图分类号: TG444.74

Influence of shielding gas on microstructure and properties of K-TIG welded 304N stainless steel

  • 摘要: 使用小孔钨极氩弧焊(K-TIG, keyhole TIG)焊接设备对13.5 mm厚度304N 不锈钢板材进行了焊接,不开坡口一道焊透成型。利用SEM,XRD,共聚焦显微镜,铁素体仪,显微硬度计分析了不同保护气体组成对焊缝化学成分、焊接接头各区域微观组织以及性能的影响。结果表明,相对于母材,当采用纯Ar作为保护气体时,焊缝N含量下降了18%,铁素体含量增加了20倍,焊缝中心的显微硬度下降了15%;当采用Ar + 3%N2作为保护气体时,焊缝N含量增加了90%,铁素体含量下降了84%,甚至某些区域的铁素体含量为零,焊缝的显微硬度提高了14%以上。
    Abstract: 304N stainless steel plate with 13.5 mm in thickness was butt welded by K-TIG without groove. The chemical components,microstructures and properties of butt welded joint were studied by SEM, XRD, 3D measuring laser microscope, hardness tester. The experimental results indicate that the N-content in the weld metal reduces by 18%, the ferrite content of weld metal increases by 20 times, and the hardness of weld decreases by 15%, compared with that of base material when pure Ar gas is used as the shielding gas. The N-content in weld metal increases by 90%, the ferrite content of weld metal reduces by 84%, and the hardness of weld increases by 14% at least when the shielding gas is the mixture of Ar + 3%N2.
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出版历程
  • 收稿日期:  2017-03-07
  • 网络出版日期:  2024-05-18

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