YUAN Xiaogang 1CAO Xuejia 2SUN Xiusheng1
作者信息
- 1. Nanjing Baose Co.,Ltd.,Nanjing 211178,China
- 2. Nanjing Boiler and Pressure Vessel Inspection Institute,Nanjing 210019,China
- 折叠
摘要
Abstract
To achieve reliable joining between Hastelloy B3 and SA-516 Gr70 dissimilar steels,this paper conducts research on relevant welding processes using gas tungsten arc welding(GTAW).Welding tests are carried out with three types of welding wires,namely ERNiMo-10,ERNiCrMo-3,and ER309LMo.The quality of the dissimilar steel welds and the me-chanical properties of the welded joints are evaluated through X-ray flaw detection,as well as tensile,bending,hardness,and impact tests.The test results show that all three types of welding wires can produce qualified welded joints.Among them,the welding process with ERNiMo-10 is stable,and its welding operability is the best;although there is a slight arc de-viation phenomenon when welding with ERNiCrMo-3,the molten pool is clear,and its fusion with the base metals on both sides is the best;when welding with ER309LMo,it is necessary to control the composition dilution in the fusion zone on the Hastelloy B3 side,which has the highest requirement for the welder's operating skills.The tensile strength of the joints of the three groups of specimens ranges from 629 MPa to 646 MPa,and fractures all occur in the base metal on the SA-516 Gr70 side.The lateral bending specimens have no opening defects,indicating good fusion of the dissimilar steel joints.To complete the product welding between the cylinder and jacket of the esterification feed tank,considering the cost of welding materials and the requirements for welding skills comprehensively,ERNiCrMo-3 welding wire and ENiCrMo-3 electrode are selected,and a combined welding process evaluation is carried out on 12.7 mm thick Hastelloy B3 and SA-516 Gr70 test plates using the combination of gas tungsten arc welding and shielded metal arc welding.The evaluation results show that the tensile strength,bending performance of the welded joints of the test plates,and the impact performance of the heat-affected zone on the SA-516 Gr70 side all meet the requirements of the welding procedure qualification for pressure equip-ment,which enables the completion of the welding between the cylinder and jacket of the esterification feed tank.关键词
Hastelloy B3/SA-516 Gr70/异种钢焊接/焊接工艺/接头性能Key words
Hastelloy B3/SA-516 Gr70/dissimilar steel welding/welding process/joint property分类
矿业与冶金
