采用摆动电弧窄间隙GMAW方法对42 mm厚的10Ni5Cr Mo V钢进行了焊接,并对其接头形貌、显微组织、硬度分布、拉伸性能和冲击韧性进行了测试分析。结果表明,该方法得到了成形良好、无任何宏观缺陷的窄间隙焊缝;焊缝组织由针状铁素体和粒状...采用摆动电弧窄间隙GMAW方法对42 mm厚的10Ni5Cr Mo V钢进行了焊接,并对其接头形貌、显微组织、硬度分布、拉伸性能和冲击韧性进行了测试分析。结果表明,该方法得到了成形良好、无任何宏观缺陷的窄间隙焊缝;焊缝组织由针状铁素体和粒状贝氏体及少部分马氏体组成;热影响区中的过热区以粗大的板条状马氏体组成,是整个焊接接头最薄弱区域,但其宽度较窄;窄间隙焊接接头具有较好的强度和韧性,无软化及脆化现象,满足使用要求。展开更多
In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A specia...In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A special welding torch was desgined, where the two wires are fed through the bent contact tip to point to each side of narrow gap groove. Effect of wire distance and bent angle of contact tip on weld bead shape is studied. The experimental results show that defect free weld bead can be obtained when the wire distarwe is 5 mm and bent angle of contact tip is 10% Finally, tandem narrow gap GMAW of 65 mm thick low carbon steel was successfully carried out with one pass per layer. The obtained weld cross-section photo indicates that there is no defect of lack of side fusion or slag inclusion.展开更多
文摘采用摆动电弧窄间隙GMAW方法对42 mm厚的10Ni5Cr Mo V钢进行了焊接,并对其接头形貌、显微组织、硬度分布、拉伸性能和冲击韧性进行了测试分析。结果表明,该方法得到了成形良好、无任何宏观缺陷的窄间隙焊缝;焊缝组织由针状铁素体和粒状贝氏体及少部分马氏体组成;热影响区中的过热区以粗大的板条状马氏体组成,是整个焊接接头最薄弱区域,但其宽度较窄;窄间隙焊接接头具有较好的强度和韧性,无软化及脆化现象,满足使用要求。
文摘In this work, a tandem narrow gap gas metal arc welding（ GMA W） system was developed to improve the efficiency in welding of thicker materials, which are mostly used in shipbuilding and nuclear power plant. A special welding torch was desgined, where the two wires are fed through the bent contact tip to point to each side of narrow gap groove. Effect of wire distance and bent angle of contact tip on weld bead shape is studied. The experimental results show that defect free weld bead can be obtained when the wire distarwe is 5 mm and bent angle of contact tip is 10% Finally, tandem narrow gap GMAW of 65 mm thick low carbon steel was successfully carried out with one pass per layer. The obtained weld cross-section photo indicates that there is no defect of lack of side fusion or slag inclusion.
