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使用光纤激光作为焊接热源,采用不同厚度的因瓦合金对WC-20Co和316L不锈钢进行对焊。使用X射线检测技术、光学显微镜、扫描电镜分析了焊缝缺陷与显微组织,研究了因瓦合金中间层厚度对WC-20Co与316L的异质金属焊接接头的影响。研究结果表明:激光焊可以实现以因瓦合金为中间层的WC-20Co/316L不锈钢的连接。因瓦合金与316L不锈钢侧连接较好,熔合较均匀,而与WC-20Co侧熔合缺陷稍多,出现气孔、裂纹等缺陷。当因瓦合金厚度为1.5 mm时,可以获得综合性能较好的焊缝成形,其焊缝宽度为3.4 mm,且焊缝内部无裂纹、气孔等缺陷。
The use of fiber laser welding heat source, using different thickness of Invar WC-20Co and 316L stainless steel butt welding. The defects and microstructure of the weld were analyzed by X-ray inspection, optical microscope and scanning electron microscope. The effects of the thickness of the middle layer of INVVA on the welded joints of WC-20Co and 316L dissimilar metals were investigated. The results show that laser welding can achieve the connection of WC-20Co / 316L stainless steel with Invar as intermediate layer. Invar alloy with 316L stainless steel side of the connection is better, more uniform fusion, and WC-20Co side fusion defects slightly, there stomata, cracks and other defects. When the thickness of the Invar alloy is 1.5 mm, the weld joint with good overall performance can be obtained with a weld width of 3.4 mm and no defects such as cracks and pores in the weld.