针对目前城市管道建设中广泛存在的传统手工焊和半自动焊接工艺所导致的焊接质量不稳定等问题,设计了一种自保护药芯焊丝管道全位置自动焊接工艺。采用氩弧自动焊根焊+自保护药芯焊丝自动焊填充及盖面焊的焊接方法,选用22°U形坡口...针对目前城市管道建设中广泛存在的传统手工焊和半自动焊接工艺所导致的焊接质量不稳定等问题,设计了一种自保护药芯焊丝管道全位置自动焊接工艺。采用氩弧自动焊根焊+自保护药芯焊丝自动焊填充及盖面焊的焊接方法,选用22°U形坡口及Φ1.6 mm JC-29Ni1焊丝。结果表明,焊接接头力学性能能够达到标准要求。该工艺能够为城市管道全位置自动焊提供参考。展开更多
环焊缝的强度匹配形式和耐腐蚀性对管道可靠运行至关重要。文中分别采用低强匹配、等强匹配和高强匹配三种匹配形式对D1219×18.4 mm X80螺旋焊管进行焊条电弧焊,对焊接接头进行抗氢致开裂(HIC)试验,并综合包括化学成分、微观组织...环焊缝的强度匹配形式和耐腐蚀性对管道可靠运行至关重要。文中分别采用低强匹配、等强匹配和高强匹配三种匹配形式对D1219×18.4 mm X80螺旋焊管进行焊条电弧焊,对焊接接头进行抗氢致开裂(HIC)试验,并综合包括化学成分、微观组织、接头强度和韧性等各种因素分析,研究不同强度匹配形式对X80管线钢环焊缝抗氢致裂纹性能的影响。结果表明,三种匹配方式下的X80管线钢焊接接头的抗HIC性能均能满足相关要求,且采用三种强度匹配焊条焊接接头的裂纹长度敏感率(CLR)、裂纹厚度敏感率(CTR)以及裂纹敏感率(CSR)随着匹配强度的升高而升高;焊缝金属的C、P、S含量对HIC敏感性有显著影响,降低这些元素的含量有助于提高焊缝的抗HIC性能;微观组织观察表明,焊缝金属的组织类型和形态对HIC敏感性也有重要影响,热力学平衡且稳定的细小组织是抗HIC的理想组织。展开更多
采用GMAW + SAW焊接工艺和自主研制的移动式自动化预制设备完成了X80M管线钢双连管的预制焊接,总结了焊接操作要点,为下一步现场施工提供指导意见。焊后,对焊接接头焊缝和热影响区组织进行了扫描电镜观察,同时测定了接头拉伸、弯曲、冲...采用GMAW + SAW焊接工艺和自主研制的移动式自动化预制设备完成了X80M管线钢双连管的预制焊接,总结了焊接操作要点,为下一步现场施工提供指导意见。焊后,对焊接接头焊缝和热影响区组织进行了扫描电镜观察,同时测定了接头拉伸、弯曲、冲击、硬度、CTOD等力学性能。试验结果表明:所采用的焊接装备,可以充分发挥埋弧焊热输入大、焊接效率高的特点,完成双连管的预制焊接工作,该工艺是对长输管道高效焊接的有益探索。焊接接头性能优良,不同焊接位置处性能均匀,满足现行标准要求,但焊缝区粒状贝氏体组织的聚集和内、外埋弧焊道分界线的存在会导致焊缝区韧性下降。The prefabrication welding of X80M pipeline steel double-connected pipes was completed using GMAW + SAW welding process and self-developed mobile automation prefabrication equipment. The main points of welding operation are summarized to provide guidance for the next field construction. After welding, the microstructure of the weld and heat-affected zone of the welded joint were observed by scanning electron microscopy, and the mechanical properties of the joint, such as tensile, bending, impact, hardness and CTOD were measured. The test results show that the welding equipment adopted can give full play to the characteristics of large heat input and high welding efficiency of submerged arc welding, and complete the pre-welding of double-connected pipes. This process is a beneficial exploration for efficient welding of long-distance pipeline. The welded joint has excellent performance and meets the requirements of current standards. However, the accumulation of granular bainite in the weld zone and the existence of the boundary between the inner and outer submerged arc welds will lead to a decrease in the toughness of the weld zone.展开更多
文摘针对目前城市管道建设中广泛存在的传统手工焊和半自动焊接工艺所导致的焊接质量不稳定等问题,设计了一种自保护药芯焊丝管道全位置自动焊接工艺。采用氩弧自动焊根焊+自保护药芯焊丝自动焊填充及盖面焊的焊接方法,选用22°U形坡口及Φ1.6 mm JC-29Ni1焊丝。结果表明,焊接接头力学性能能够达到标准要求。该工艺能够为城市管道全位置自动焊提供参考。
文摘环焊缝的强度匹配形式和耐腐蚀性对管道可靠运行至关重要。文中分别采用低强匹配、等强匹配和高强匹配三种匹配形式对D1219×18.4 mm X80螺旋焊管进行焊条电弧焊,对焊接接头进行抗氢致开裂(HIC)试验,并综合包括化学成分、微观组织、接头强度和韧性等各种因素分析,研究不同强度匹配形式对X80管线钢环焊缝抗氢致裂纹性能的影响。结果表明,三种匹配方式下的X80管线钢焊接接头的抗HIC性能均能满足相关要求,且采用三种强度匹配焊条焊接接头的裂纹长度敏感率(CLR)、裂纹厚度敏感率(CTR)以及裂纹敏感率(CSR)随着匹配强度的升高而升高;焊缝金属的C、P、S含量对HIC敏感性有显著影响,降低这些元素的含量有助于提高焊缝的抗HIC性能;微观组织观察表明,焊缝金属的组织类型和形态对HIC敏感性也有重要影响,热力学平衡且稳定的细小组织是抗HIC的理想组织。
文摘采用GMAW + SAW焊接工艺和自主研制的移动式自动化预制设备完成了X80M管线钢双连管的预制焊接,总结了焊接操作要点,为下一步现场施工提供指导意见。焊后,对焊接接头焊缝和热影响区组织进行了扫描电镜观察,同时测定了接头拉伸、弯曲、冲击、硬度、CTOD等力学性能。试验结果表明:所采用的焊接装备,可以充分发挥埋弧焊热输入大、焊接效率高的特点,完成双连管的预制焊接工作,该工艺是对长输管道高效焊接的有益探索。焊接接头性能优良,不同焊接位置处性能均匀,满足现行标准要求,但焊缝区粒状贝氏体组织的聚集和内、外埋弧焊道分界线的存在会导致焊缝区韧性下降。The prefabrication welding of X80M pipeline steel double-connected pipes was completed using GMAW + SAW welding process and self-developed mobile automation prefabrication equipment. The main points of welding operation are summarized to provide guidance for the next field construction. After welding, the microstructure of the weld and heat-affected zone of the welded joint were observed by scanning electron microscopy, and the mechanical properties of the joint, such as tensile, bending, impact, hardness and CTOD were measured. The test results show that the welding equipment adopted can give full play to the characteristics of large heat input and high welding efficiency of submerged arc welding, and complete the pre-welding of double-connected pipes. This process is a beneficial exploration for efficient welding of long-distance pipeline. The welded joint has excellent performance and meets the requirements of current standards. However, the accumulation of granular bainite in the weld zone and the existence of the boundary between the inner and outer submerged arc welds will lead to a decrease in the toughness of the weld zone.
