Microstructure Evolution of 2205DSS GTAW Welded Joint
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摘要: 研究了ER2205不锈钢在固定焊接参数条件下的自动TIG焊接接头的两相组织演化规律。结果表明:受到原始焊道热作用的TIG焊缝具有约50%~60%的铁素体相比例,对应热影响区中的铁素体含量高达70%;随着焊接过程的进行,受到后续焊道热作用影响的焊缝和热影响区的铁素体含量持续降低;在后续焊道焊接过程中焊缝组织不断析出奥氏体相,铁素体相比例不断降低;热影响区中的铁素体含量受到自身焊道和后续一个焊道的影响比较明显;焊缝中部焊道的铁素体相比例低于打底焊道和盖面层焊道。Abstract: The two-phase microstructure evolution of automatic TIG welded joints of ER2205 stainless steel under fixed welding parameters was studied. The results show that the TIG weld line subjected to a single weld heat effect has a ferritic phase ratio of about 50%~60%, whereas the ferrite content in the heat affected zone is as high as 70%; that with the progressing of the welding process, the ferrite contents in the weld and heat affected zone, affected by the heat from the subsequent weld passes, continue to decrease; that the austenite phase precipitates continuously in the weld bead during the subsequent welding process, the proportion of ferrite decreases continuously; that the ferrite formation of HAZ would be significantly affected by the weld pass of itself and the subsequent weld passes; that the ratios of ferrite in the middle passes of the weld are lower than those in the bottom and the capping passes.
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Key words:
- 2205 DSS /
- ferrite /
- heat affected zone /
- microstructure evolution
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