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试验中采用厚度为7mm的AH36船舶钢,具有较高的强度、良好的耐腐蚀性能、焊接性能,母材屈服强度为401MPa,抗拉强度为555MPa,伸长率为28%,化学成分如表 1所示。AH36母材的显微组织如图 1所示。可以看出,AH36由大量铁素体和少量珠光体组成。
Table 1. Chemical composition and content of AH36 ship steel
element mass fraction C 0.0017 Si 0.0026 Mn 0.0146 P 0.00018 S 0.00004 Nb 0.00001 Fe balance 试验中采用的焊丝为1.2mm的ER50-6焊丝,具有良好的刚直度、指向性,其化学成分如表 2所示。
Table 2. Chemical composition and content of ER50-6 welding wire
element mass fraction C 0.0008 Si 0.0088 Mn 0.0152 S 0.00015 P 0.0002 Cu 0.002 Fe balance 试验中涉及到的激光-MIG复合焊设备属于龙门式机器人激光焊接系统,采用KUKA KR16型机器人,光纤激光器为IPG Photonics公司生产,型号为YLS-10000,光纤直径为200μm,输出激光功率最大为10kW,激光波长为1.064μm,焊机型号为TPS5000,系统整体图如图 2所示。
激光功率对激光-MIG复合焊焊缝成型影响研究
Research on the influence of laser power on laser-MIG hybird weld forming
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摘要: 为了研究激光功率对船舶钢激光-熔化极惰性气体复合焊焊缝成型的影响,采用不同激光功率在7mm AH36船舶钢板上进行对接工艺试验,并进行了微观组织观测和力学性能测试,通过理论分析和实验验证,取得了焊缝成型最佳的工艺参量、焊缝接头不同区域微观组织、力学性能等数据。结果表明,在激光功率为6kW、电流为220A、焊接速率为1.2m/min时焊接,焊缝成型最好,焊缝区组织为板条马氏体及少量铁素体,其抗拉强度为545MPa,力学性能符合国家标准和中国船级社材料与焊接规范要求。这对于船舶钢的激光复合焊接具有一定的指导意义。
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关键词:
- 激光技术 /
- 激光-熔化极惰性气体复合焊 /
- 焊瘤 /
- 船舶钢
Abstract: In order to study the influence of laser power on the formation of laser-metal inert-gas composite welding seam of ship steel, joint test of 7mm AH36 ship steel plate with different laser powers, microstructure observation and mechanical properties test were carried out. Theoretical analysis and experimental verification were carried out. The optimum technological parameters of weld forming, microstructures and mechanical properties of different regions of weld joints were obtained. The results show that, at laser power of 6kW, current of 220A and welding rate of 1.2m/min, weld forming is the best. The structure of weld zone is lath martensite and a little ferrite. Its tensile strength is 545MPa. The mechanical properties meet the requirements of national standards and China Classification Society specifications. This has certain guiding significance for laser hybrid welding of ship steel.-
Key words:
- laser technique /
- laser-metal inert-gas hybrid welding /
- welding tumor /
- ship steel
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Table 1. Chemical composition and content of AH36 ship steel
element mass fraction C 0.0017 Si 0.0026 Mn 0.0146 P 0.00018 S 0.00004 Nb 0.00001 Fe balance Table 2. Chemical composition and content of ER50-6 welding wire
element mass fraction C 0.0008 Si 0.0088 Mn 0.0152 S 0.00015 P 0.0002 Cu 0.002 Fe balance -
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