为研究590 MPa级高强钢双面双弧工艺得到的焊接接头组织与性能的关系，采用钨极氩弧焊（ TIG）与熔化极气体保护焊（ MAG）方法获得成型良好的焊接接头，经过拉伸、冲击、弯曲试验及光学显微镜、扫描电镜、EBSD分析，对590 MPa级高强钢双面双弧立焊打底焊与盖面焊焊接接头的组织及性能进行了研究。结果表明：打底焊缝组织主要为贝氏体，盖面焊缝组织以贝氏体与针状铁素体为主；打底焊缝经历过一次热循环后组织得到一定程度的细化；打底焊缝硬度值与盖面焊缝相近，盖面焊缝热影响区最高硬度值高于打底焊缝热影响区最高硬度；2 mm坡口间隙性能较5 mm坡口间隙有较大提高，2 mm坡口间隙断口以韧窝断裂为主，5 mm坡口间隙断口以解理断裂为主。
To establish the relationship between microstructures and mechanical properties of 590 MPa high strength steel through double?sided arc welding, the welded joints were obtained by TIG and MAG. The properties, including tensile, strength, toughness, and flexural strength, were measured. The microstructures were observed by optical microscopy, scanning electron microscopy and electron backscattered diffraction. In this paper, the microstructure and properties of welded joint of the 590 MPa high strength steel double?sided arc vertical welding of back welding and cosmetic welding are studied. The results show that the backing weld bead mainly consists of bainite while the cosmetic welding bead mainly consists of acicular ferrite and bainite. Meanwhile, microstructure of the cosmetic welding bead become finer after one thermal cycle. The hardness of backing weld bead is close to that of the cosmetic welding bead. The highest hardness value of heat affected zone in the cosmetic weld bead is higher than that of the backing weld bead. The performance of the 2 mm groove gap is better than that of 5 mm one. Dimple fracture dominates the 2 mm groove gap whereas cleavage fracture dominates the 5 mm groove gap upon loading. .
参考文献
| [1] | 邓宏筹.面向21世纪的柔性制造技术[J].中国工程科学,2000(09):12-23. |
| [2] | Hongming GAO;Lin WU;Honggang DONG.Current Density Distribution in Double-Sided GTAW Process[J].材料科学技术学报(英文版),2001(01):187-188. |
| [3] | Y. M. Zhang;S. B. Zhang.Double-sided arc welding increases weld joint penetration[J].Welding Journal,19986(6):57-61. |
| [4] | 冯曰海;周方明;蒋成禹.双弧焊接工艺研究现状及发展[J].焊接,2002(1):5-9. |
| [5] | Y. M. ZHANG.Welding Aluminum Alloy 6061 with the Opposing Dual-Torch GTAW Process[J].Welding Journal,19996(6):0-0. |
| [6] | Y. M. Zhang;C. Pan;A. T. Male.Welding of austenitic stainless steel using double sided arc welding process[J].Materials Science and Technology: MST: A publication of the Institute of Metals,200110(10):1280-1284. |
| [7] | 安同邦;田志凌;单际国;魏金山.保护气对1000 MPa级熔敷金属组织及力学性能的影响[J].金属学报,2015(12):1489-1499. |
| [8] | 肖炯 .600MPa级船用低合金高强钢T形接头的CO2激光复合焊接[D].上海交通大学,2011. |
| [9] | 马凯夫;郑世达;易江龙;尹登峰;郭春富;王凯.热输入对921A钢焊接接头性能及显微组织的影响[J].电焊机,2014(3):50-54. |
| [10] | 安同邦;单际国;魏金山;杜全斌;彭云;田志凌.热输入对1000 MPa级工程机械用钢接头组织性能的影响[J].机械工程学报,2014(22):42-49. |
| [11] | 缪成亮;尚成嘉;王学敏;张龙飞;Mani Subramanian.高Nb X80管线钢焊接热影响区显微组织与韧性[J].金属学报,2010(5):541-546. |
| [12] | Yusaku Tomio;Tadashi Furuhara;Tadashi Maki.Effect of Cooling Rate on Superelasticity and Microstructure Evolution in Ti-10V-2Fe-3Al and Ti-10V-2Fe-3Al-0.2N Alloys[J].Materials transactions,200912(12):2731-2736. |
| [13] | 安同邦;田志凌;单际国;彭云;魏金山;崔冰.后热温度对1000 MPa级高强钢焊缝组织与性能的影响[J].机械工程学报,2015(4):40-46. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%