焊接工艺对S32205双相不锈钢组织和性能的影响

为确定合理的焊接工艺及焊接材料,使S32205双相不锈钢的焊接接头具有预期的显微组织和相比例,以保证该双相不锈钢的焊接接头具有较强的耐腐蚀性能,分析研究了该材料在不同焊接工艺下产生的显微组织、力学性能和耐腐蚀性能,以期对实际生产中双相不锈钢的焊接起到指导作用。     

超级双相不锈钢2507焊接工艺研究现状

主要梳理和综述了超级双相不锈钢2507焊接方面的研究工作,从而对超级双相不锈钢2507焊接工艺进行指导。从超级双相不锈钢2507焊接工艺、焊接接头两相比例调节两个维度进行综述,其中,超级双相不锈钢2507焊接工艺部分从钨极氩弧焊、埋弧焊、等离子弧焊、激光焊、电子束焊、激光-电弧复合焊这6种焊接工艺开展评述,焊接接头两相比例调节部分从调整焊接热输入、焊后热处理、添加合金元素镍或氮3个方面进行评述。结合国内外研究现状,探讨了超级双相不锈钢焊接如何控制接头两相比例这一关键问题。研究现状表明:钨极氩弧焊、等离子弧焊和激光焊可以较好地实现超级双相不锈钢优质焊接;添加合金元素镍或氮是调控焊接接头两相比例的重要手段。开展超级双相不锈钢2507焊接工艺研究现状的综述具有重要意义,向熔池过渡合金元素的高能量密度焊接工艺可能是超级双相不锈钢焊接的优选技术。     

双相不锈钢焊接用填充材料的发展

双相不锈钢焊接用填充材料的发展１前言据德刊＜ＳｃｈｗｅｉｓｓｕｎｄＳｃｈｎｅｉｄｅｎ＞１９９４年第４期报道，对双相不锈钢焊接用填充材料已开发出第五代焊条。众所周知，焊接双相不锈钢用的填充材料的镍含量必须比基体材料的高些，才能获得良好的韧性和腐蚀性能。...     

双相不锈钢焊接性问题原因及控制

综述了双相不锈钢焊接过程中存在焊接性问题原因及控制方法。基材/焊接材料化学成分、焊接输入线能量和冷却速度是影响双相不锈钢接头中两相比例、有害相析出、氢致裂纹、残余应力及变形的主要因素,通过合理选材和控制工艺参数可获得综合性能良好的双相不锈钢焊接接头;避免焊接和使用过程中环境氢含量较高是防止双相不锈钢氢致裂纹的另一有效途径。     

核电用S32101双相不锈钢的焊接性研究

双相不锈钢S32101广泛应用于AP1000三代核电楼板结构模块抗腐蚀内壁板,本文对双相钢焊接性进行了研究,分析了不同线能量条件下接头性能的变化,尤其是冲击韧性的变化。     

钢煤斗不锈钢内衬焊接

马氏体不锈钢1Cr13与低合金钢Q345的焊接，极易产生裂纹缺陷。在户县热电厂工程煤斗不锈钢内衬焊接中，选用双相不锈钢焊条冷焊和合理的焊接工艺，取得了较好的效果。     

双相不锈钢焊接技术状况

双相不锈钢具有优异的综合性能，应用范围广，其焊接技术独具特点，受到特别关注。本文论述了双相不锈钢焊接的基本原则，焊丝、保护气体及焊接参数的选择等。     

焊接方式对双相不锈钢在磷酸溶液中电化学行为的影响

焊接方式对不锈钢焊接区域的耐蚀性有重要影响。采用单面焊、双面焊、氩弧焊等3种方式对双相不锈钢进行焊接,采用电化学测试系统测试了3种焊接方式的焊接区、热影响区在磷酸溶液中的极化曲线和电化学阻抗谱。结果表明:双相不锈钢经焊接后可获得耐蚀性能优异的焊接组织,3种焊接工艺的自腐蚀电流大小依次为单面焊>氩弧焊>双面焊;焊接区和热影响区电化学阻抗谱图形状大致相似,容抗弧半径大小依次为氩弧焊>双面焊>单面焊;氩弧焊的焊接组织均匀、缺陷少,其焊接区及热影响区的钝化膜更加致密,其热影响区钝化膜性能比焊接区差。     

双相不锈钢焊接接头宏观金相试样的制备

采用标准推荐的不锈钢焊接接头宏观金相试样制备方法,发现双相不锈钢焊接接头的宏观金相形貌不清晰。将电解腐蚀方法应用至双相不锈钢焊接接头宏观金相试样的制备,通过试验确定了合适的电解液和电解腐蚀参数。结果表明:在电解液为10mL HNO_3溶液+90mL H_2O+1g NaCl,电流密度为1.11mA·mm~(-2),腐蚀时间为2min的条件下,可获得各区域清晰可见的双相不锈钢焊接接头宏观金相试样。     

双相不锈钢2205-Q345R复合板焊接性能试验研究

采用爆炸焊接方法制作双相不锈钢2205-Q345R复合板,需将复层2205进行拼焊,以满足不同尺寸要求,未复合区需进行补焊.根据双相不锈钢2205-Q345R复合板的焊接性,对双相不锈钢2205拼焊和2205-Q345R复合板未复合区补焊工艺进行了试验研究,结果表明:焊接接头各项性能均能满足相关指标要求.     

Effect of welding processes on fatigue crack growth behaviour of AISI 409M ferritic stainless steel joints fabricated using duplex stainless steel fillers

The present investigation aims to study the effect of welding processes such as shielded metal arc welding (SMAW), gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) on fatigue crack growth behaviour of the ferritic stainless steel (FSS) conforming to AISI 409M grade. Rolled plates of 4 mm thickness were used as the base material and AISI 2209 grade duplex stainless steel (DSS) was used as filler metal, for preparing single pass butt welded joints. Centre cracked tensile (CCT) specimens were used to evaluate the fatigue crack growth behaviour. From this investigation, it is found that the GTAW joints showed superior fatigue crack growth resistance compared with SMAW and GMAW joints. The reasons for the superior performance were discussed in detail.     

Effect of welding parameters on the fatigue properties of dissimilar AISI 2205–AISI 1020 joined by friction welding

In this study, AISI 2205 duplex stainless steel, most commonly used in its class and economical AISI 1020 steel couple with low carbon content, were connected using different operation parameters through friction welding. Tension test and rotary bending fatigue test were applied to the welded connections, and the impact of the welding parameters on fatigue strength was examined. It was discovered that when the welding parameters used in connecting AISI 2205 and AISI 1020 steel couple through friction welding were selected correctly, fatigue strength of the connection would increase compared to the main material, and incompliant parameters decreased fatigue strength.     

022Cr22Ni5Mo3N双相不锈钢的焊接

本文从焊接材料的选择、焊接的准备及焊接施焊过程等方面介绍了022Cr22Ni5Mo3N双相不锈铜的焊接情况,通过对焊接接头的焊后检验分析,证明此焊接工艺方案确实可行,对实际生产中022Cr22Ni5Mo3N双相不锈钢的焊接具有一定的指导意义。     

焊接工艺对不锈钢角焊缝连接试件力学性能影响研究

对12个奥氏体型及12个双相型不锈钢正面角焊缝和侧面角焊缝连接试件进行了单调拉伸试验,考察了不同焊接工艺对角焊缝连接力学性能的影响。结果表明:采用氩弧焊焊接工艺的不锈钢角焊缝试件破坏面与电弧焊焊接工艺的试件破坏面形状相差较大,后者破坏面更加光滑;同时由于受到复杂应力的作用,正面角焊缝试件的真实破坏角度并不为相关规范规定的理论值45°;对于奥氏体型不锈钢角焊缝,氩弧焊试件与电弧焊试件的强度比分别为1.03 (正面角焊缝试件)及1.13 (侧面角焊缝试件),相对变形量之比为1.46及1.11;而对于双相型不锈钢角焊缝,两者的强度比分别为1.12和1.04,相对变形量之比为1.66及1.45;氩弧焊试件表现出了更好的力学性能。对于两种不锈钢材料,正面角焊缝强度均远大于侧面角焊缝的强度,建议在工程设计和相关规范的编制/修订中考虑正面角焊缝强度提高的影响。     

Tensile and Impact Properties of Shielded Metal Arc Welded AISI 409M Ferritic Stainless Steel Joints

The present study is concerned with the effect of filler metals such as austenitic stainless steel, ferritic stainless steel and duplex stainless steel on tensile and impact properties of the ferritic stainless steel conforming to AISI 409M grade. Rolled plates of 4 mm thickness were used as the base material for preparing single pass butt welded joints. Tensile and impact properties, microhardness, microstructure and fracture surface morphology of the joints fabricated by austenitic stainless steel, ferritic stainless steel and duplex stainless steel filler metals were evaluated and the results were reported. From this investigation, it is found that the joints fabricated by duplex stainless steel filler metal showed higher tensile strength and hardness compared to the joints fabricated by austenitic and ferritic stainless steel filler metals. Joints fabricated by austenitic stainless steel filler metal exhibited higher ductility and impact toughness compared with the joints fabricated by ferritic stainless steel and duplex stainless steel filler metals.     

SA240-S31803双相不锈钢焊接接头组织研究

研究了SA240-S31803双相不锈钢的焊接工艺,分析了双相不锈钢的相组织,结果表明,焊接接头的铁素体相比例约为35%～69%,焊缝打底层的铁素体含量比盖面层降低约15%,同焊接位置的焊缝比较,热影响区铁素体含量降低约20%。     

Impact behavior of different stainless steel weldments at low temperatures

A comparative study was made of the fracture behavior of austenitic and duplex stainless steel weldments at cryogenic temperatures by impact testing. The investigated materials were two austenitic (304L and 316L) and one duplex (2505) stainless steel weldments. Shielded metal arc welding (SMAW) and tungsten inert gas welding (TIG) were employed as joining techniques. Instrumented impact testing was performed between room and liquid nitrogen (?196 °C) test temperatures. The results showed a slight decrease in the impact energy of the 304L and 316L base metals with decreasing test temperature. However, their corresponding SMAW and TIG weld metals displayed much greater drop in their impact energy values. A remarkable decrease (higher than 95%) was observed for the duplex stainless steel base and weld metals impact energy with apparent ductile to brittle transition behavior. Examination of fracture surface of tested specimens revealed complete ductile fracture morphology for the austenitic base and weld metals characterized by wide and narrow deep and shallow dimples. On the contrary, the duplex stainless steel base and weld metals fracture surface displayed complete brittle fracture morphology with extended large and small stepped cleavage facets. The ductile and brittle fracture behavior of both austenitic and duplex stainless steels was supplemented by the instrumented load–time traces. The distinct variation in the behavior of the two stainless steel categories was discussed in light of the main parameters that control the deformation mechanisms of stainless steels at low temperatures; stacking fault energy, strain induced martensite transformation and delta ferrite phase deformation.     

Micro flash butt welding of super duplex stainless steel with Zr-based metallic glass insert

Micro flash butt welding of super duplex stainless steel with Zr-based metallic glass insert was carried out. Zr₅₅Cu₃₀Ni₅Al₁₀ of Zr-based metallic glass with thickness of 50 μm and Zr metal with thickness of 500 μm were used as the insert materials. After welding, Zr-based metallic glass insert became much thinner than that of Zr metal insert. The supercooled liquid of Zr-based metallic glass insert at the interface was protruded outside of the specimen during welding. The formation of the protrusion discharged the oxide films on the butting surfaces and contact surface, resulting in metallurgical bonding through the fresh surfaces. The Fe-Zr metallic compounds were observed at the bonding interface for the Zr metal insert, but the metallic compound for Zr-based metallic glass insert was hardly observed. The micro flash butt welding of stainless steel with Zr-based metallic glass insert was successfully welded.     

Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

The microstructure and corrosion resistance of dissimilar weld-joints between stainless steel SAF 2205 and stainless steel AISI 316 L were investigated. Welding was accomplished by different types of welding wires AWS ER 347, AWS ER 316 L and AWS ER 309 L. To verify soundness of welded samples, nondestructive tests were performed. Metallographic samples were prepared from cross-section areas of weldjoints to investigate microstructure of different regions of weld-joints by optical microscopy and scanning electron microscopy. Corrosion resistance of weld-joints was evaluated in NaCl solution by potentiodynamic polarization and electrochemical impedance techniques. In the weld metal AWS ER 347, the brittle sigma phase was created, resulting in the decrease of weld-joint corrosion resistance. According to the results of metallurgical investigations and corrosion tests, welding wire AWS ER 309 L was suitable for welding duplex stainless steel(SAF 2205) to austenitic stainless steel(AISI 316L) by gas tungsten arc welding(GTAW)process.