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以高Cr、Ni合金粉为填加材料,采用Nd∶YAG脉冲激光对0.1 mm+0.8 mm+0.1 mm双面超薄不锈钢复合板进行对接焊,对焊接接头的组织、抗拉强度、焊缝区显微硬度以及焊缝表面耐腐蚀性能进行了研究。结果表明,激光焊接的表面成形性好、变形小、无缺陷,焊缝金属与覆层不锈钢及基层碳钢连接良好;焊缝中心为晶粒取向不规律的细小等轴晶,其他区域为柱状晶,几乎看不到热影响区,焊缝表面为奥氏体+少量铁素体+少量马氏体组织;焊接接头的抗拉强度达到了母材的92%,伸长率为母材的25%;焊缝区显微硬度与母材相比有显著提高;不锈钢复合板焊缝表面和母材覆层抗电化学腐蚀性能接近。
The high-Cr and Ni alloy powders were used as the filler materials, and the butt-welding of 0.1 mm + 0.8 mm + 0.1 mm double-sided ultra-thin stainless steel clad plates was carried out by using Nd:YAG pulsed laser. The microstructure, tensile strength, Area microhardness and corrosion resistance of the weld surface were studied. The results show that the laser welding has good surface formability, small deformation and no defects. The weld metal is well connected with the coated stainless steel and the base carbon steel. The center of the weld is small equiaxed grain with irregular grain orientation. The other areas are columnar Crystal, almost no heat affected zone, the weld surface of austenite + a small amount of ferrite + a small amount of martensite; welded joints tensile strength reached 92% of the base metal, the elongation of the base metal 25%. The microhardness of the weld zone is significantly higher than that of the base metal. The surface of the stainless steel clad plate and the base metal coating have similar electrochemical corrosion resistance.