| 摘要: |
| 试验采用5 mm的304不锈钢板材,利用等离子电弧进行水下湿法焊接工艺试验.通过观察焊缝外观形貌和金相显微镜宏观组织,并借助超景深光学显微镜,评价了接头界面微观组织特征,最后通过拉伸试验对焊接接头的力学性能进行了测试.结果表明,水下等离子湿法焊接可以获得稳定电弧和优质焊缝,满足焊接性能要求.焊缝晶粒以均匀但略微粗化的平行树枝状晶为主,其间存在有较为致密、均匀的树枝状等轴晶.焊缝抗拉强度达到母材的77.56%.断口形态为典型的韧性断裂,但其表面存在的气孔,影响了焊缝力学性能. |
| 关键词: 水下湿法焊接 等离子焊接 组织性能 力学性能 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(51005049);哈尔滨市高新技术产业专项资金资助项目(ZX2012ZC006015) |
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| Process analysis of underwater plasma welding on stainless steel |
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MIAO Yugang1, ZHANG Benshun1, CHEN Guangyu2, HAN Duanfeng1
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1.National Key Laboratory of Science and Technology on Underwater Vehicle, Harbin Engineering University, Harbin 150001, China;2.College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
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| Abstract: |
| The plasma underwater welding technology (PUW)was proposed and the welding process test was carried out on 304 stainless steel with a thickness of 5 mm. The optical microscopy, the super depth of field optical microscopy, tensile testing machine were applied to observe and to analyze the joint morphology as well as the mechanical properties. The results show that PUW can obtain stable arc and high-quality weld. The microstructure of weld metal mainly consisted of homogeneously distributed slightly coarsened dendritic crystal, some regions existed dense and uniform equiaxial dendritic crystal. The tensile strength of welded joints was about 77.56%. The fractured surface morphology presented typical ductile fracture. But the pores present on the weld surfaceaffect the mechanical properties of the weld. |
| Key words: underwater wet welding plasma arc welding organizational performance mechanical properties |
