摘要:
研究双相不锈钢使用和焊接性能,在等离子弧焊适应性基础上,采用小孔型等离子弧焊(PAW)、小孔型等离子弧焊(PAW)+自动钨极氩弧焊(GTAW)填丝盖面、小孔型等离子弧焊(PAW)+自动钨极氩弧焊(GTAW)填丝盖面+自动钨极氩弧焊(GTAW)自熔封底三种焊接工艺方案进行S22053双相不锈钢焊接工艺试验,通过无损检测、拉伸、弯曲、低温冲击、金相分析等方法对不同焊接工艺试件焊态接头质量、性能及组织进行分析研究。结果表明:三种焊接工艺完成的双相不锈钢焊接接头抗拉强度均高于母材,具有优异塑性、韧性和耐蚀性能,满足双相不锈钢使用要求;小孔型不填丝PAW接头力学性能耐蚀性能最好,在采用自动GTAW填丝盖面和自熔封底焊接后,接头韧性和耐蚀性能有一定下降。
Abstract:
The welding procedure test of S22053 duplex-stainless steel is performed by the keyhole PAW,the keyhole PAW+ auto-GTAW with filler metal for cover pass and the keyhole PAW+ auto-GTAW with filler metal for cover pass+auto-GTAW without filler metal for root pass in order to study service and welding characteristic of duplex-stainless steel as well as PAW suitability.The quality,properties and structure of these joints are analyzed by nondestructive examination,tension,bend,low-temperature impact as well as metallographic tests.These joints made by three welding procedures show higher tension strength than S22053 base metal,and excellent ductility,toughness and corrosion resistance,which meets the requirement of service characteristic for duplex-stainless steel. Compared with the PAW joint,the toughness and corrosion resistance of the joint welded by auto-GTAW with the filler metal after PAW weld decrease to a certain degree.
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