摘要:新型细丝埋弧焊接技术可用来焊接薄板，所使用的焊接设备简便易于改装，且生产效率较高，成本低。在桥梁钢结构和建筑钢结构的生产中已体现出了焊接质量高、生产效率高等优越性，但其对于对不同材料的应用以及在投入生产前，它的焊接工艺还需要通过试验进一步的研究。

此外，细丝埋弧焊设备相对于传统埋弧焊设备也是一种创新。单丝细丝埋弧焊设备采用二氧化碳气体保护焊的送丝机构、焊接电源同时使用二氧化碳气体保护焊的焊枪，可以使用直径较细的焊丝，但它同时采用了传统埋弧焊焊剂保护的形式。因此实验前对细丝埋弧焊设备组成以及工作原理进行了研究。

本实验采用细丝埋弧焊技术对两块6mm厚的S30408奥氏体不锈钢进行焊接，接头形式为对接，对接头工艺性能进行分析。焊接时，开V型坡口，坡口根部使用氩弧焊打底，然后利用细丝埋弧焊盖面，使得焊缝质量得到有效保证。焊接后对细丝埋弧焊所得的焊接接头进行力学性能检测（主要进行拉伸、弯曲、和硬度检测）之后利用精密仪器设备观察焊缝的微观金相组织。

试验结果表明：奥氏体不锈钢细丝埋弧焊所得焊接接头性能良好，无表面裂纹、气孔、夹杂、咬边及弧坑，根部未出现未熔合与未透现象。NB/T47014为检测标准，对力学性能进行检测，所得产品合格。抗拉强度为610MPa。弯曲试验中背弯及面弯完好，D=24，d=180，试样的抗拉强度和弯曲性能符合母材要求的最低标准。对金相试样进行分析，所得组织均匀完整，硬度也符合母材S30408的标准。在焊接工艺参数及操作过程合理的情况下细丝埋弧焊工艺可用于奥氏体不锈钢的对接焊接中。同时对设备的使用也体现了新型细丝埋弧焊设备有良好的可应用性。

关键词：奥氏体不锈钢，细丝埋弧焊设备，力学性能，组织分析

Abstract:Submerged arc welding This new type of welding technology can be used for the welding of thin plates, the use of welding equipment is simple and easy to modify, and high production efficiency, low cost. In the production of bridge steel and construction steel structure has shown a high quality welding, high production efficiency, but its application for different materials and in the production before the need for its welding process a lot of research.

In addition, the filament submerged arc welding equipment relative to the traditional submerged arc welding equipment is also an innovation. Single wire filament submerged arc welding equipment using CO2 gas shielded welding wire feeding mechanism, welding torch, and welding power supply, you can use smaller diameter wire, but it also uses the traditional form of submerged arc welding protection. Therefore, the composition and working principle of the submerged arc welding equipment were studied before the experiment.

In this experiment, two 6mm thick S30408 austenitic stainless steels were welded by means of filament submerged arc welding. The joint performance was analyzed by butt joint. Welding, open V-groove, groove root use of argon arc welding bottom, the use of filament submerged arc welding to ensure the quality of the weld. The mechanical properties of the joints after the test (tensile, bending, and hardness test) and macro and microstructure analysis.

The results show that the welded joints of austenitic stainless steel filament arc welding have good performance, no surface cracks, pores, inclusions, undercutting and crater, and the roots are not fused and not penetrated. According to NB / T47014 testing standards, the mechanical properties of the test, the product qualified. The tensile strength is 610MPa. Bending test in the back bend and face bend intact, D = 24, d = 180. The analysis of the metallographic samples, the integrity of the organization, in the welding

process parameters and the operation of a reasonable process under the case of filament submerged arc welding process can be used for austenitic stainless steel butt welding. The new filament submerged arc welding equipment has good applicability.