论文部分内容阅读
基于D406A钢与20钢焊接过程冷裂纹的产生,从优化焊接材料角度出发,研制两种D406A氩弧焊用焊丝。通过降低碳含量,增加镍含量进行焊丝合金系的设计。采用金相组织、拉伸强度、冲击韧性以及冷裂纹敏感性测试来分析新焊丝的可行性。试验结果表明,新开发的两种焊丝焊接接头强度与原ER50-6焊丝相当,但是接头冲击韧性明显提高。原焊丝斜Y坡口冷裂纹敏感性测试中发现多条裂纹,而新研制的焊丝无裂纹产生。由此说明,新研制的焊丝在满足强度设计要求的前提下,有效降低了接头的冷裂纹敏感性,满足生产实际要求。
Based on the generation of cold cracks in the welding process of D406A steel and 20 steel, two D406A welding wires were developed from the viewpoint of optimizing welding materials. By reducing the carbon content, increase the nickel content of the wire alloy system design. The feasibility of the new wire was analyzed using microstructure, tensile strength, impact toughness, and cold crack susceptibility testing. The test results show that the newly developed two kinds of welding wire with the same strength as the original ER50-6 wire, but the joint impact toughness improved significantly. The original wire inclined Y groove cold crack sensitivity test found that a number of cracks, and the newly developed wire without cracks. This shows that the newly developed wire under the premise of meeting the strength design requirements, effectively reducing the cold crack sensitivity of the joint to meet the actual production requirements.