Study on microstructures and mechanical properties of laser–arc hybrid welded S355J2W+N steel
Study on microstructures and mechanical properties of laser–arc hybrid welded S355J2W+N steel
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DOI：
10.1016/j.optlastec.2013.11.021
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发表时间：
2014-07
影响因子：
5
通讯作者：
S. Zhen;Z. Duan;Daqian Sun;Y. Li;D. Gao;Hongmei Li
中科院分区：
文献类型：
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作者：
S. Zhen;Z. Duan;Daqian Sun;Y. Li;D. Gao;Hongmei Li
采用激光-MAG复合焊接工艺对16 mm厚耐候钢S355 J2 W +N进行了焊接试验。在试验所用的焊接工艺参数下，采用三层三道焊工艺，获得了无气孔、裂纹、未熔合等缺陷的全熔透焊缝。通过与传统MAG焊焊接接头的比较，总结了激光-电弧复合焊的突出优势。对复合焊接接头的微观组织进行了详细的研究。此外，根据相应的欧洲标准进行机械性能测试。此外，激光-MAG复合焊接接头的拉伸和冲击强度与母材几乎相同。大多数复合焊接接头具有良好的弯曲性能，但在某些试样中，在收缩应力积累和残留的过渡区出现了长度为0.9 mm的微裂纹，是焊缝金属中最脆弱的区域之一。结果表明，激光-MAG复合焊接技术适用于S355 J2 W +N厚板的焊接，不仅有利于提高产品性能，而且有利于降低生产成本，提高生产效率。
The technology of laser–MAG hybrid welding was used on 16 mm thick plate of weathering steel S355J2W+N. Under the welding parameters used in the experiment, full penetration weld without flaws such as pores, cracks and lack of fusion was obtained by a three-layer and three-pass welding technique. In this study, the outstanding advantages of laser–arc hybrid welding were summarized by comparison with welded joint of traditional MAG welding. The microstructure of hybrid welded joint has also been detailed investigated. Besides, the mechanical property tests were performed according to corresponding European standards. Furthermore, the tensile and impact strength of laser–MAG hybrid welded joint turned out to be almost as good as base metal. Most of the hybrid welded joints had a good bending property, but for some sample, there was a micro-crack with the length of 0.9 mm emerging within the transition region where contraction stress would accumulate and remain, being one of the most vulnerable zones in weld metal. The results show that laser–MAG hybrid welding technology is appropriate for S355J2W+N thick plate welding, in favor of not only improving the product performance, but also lowering the production cost and improving the productivity.