H13模具钢低功率活性激光焊

传统焊接修复失效模具耗时长,热输入分散,容易引起热影响区性能恶化;激光焊修复失效模具自动化程度高、工时短、热输入量集中,但高功率激光修复模具性价比较低。将活性焊接技术应用于模具修复,在低功率下可获得较高的熔深,有效的降低成本。以H13热模具钢为试验对象,研究了低功率下活性剂对激光焊缝宏观表面形貌、熔深熔宽以及微观组织形貌的影响。试验结果表明,涂覆活性剂后,焊缝表面成型更好,焊缝颜色光亮,鱼鳞纹清晰可见;焊缝熔宽在涂敷活性剂后会略有增加,而熔深则增加明显,增深接近一倍。活性剂不管涂敷与否,焊缝均没有裂纹、气孔、夹杂等缺陷,但是涂覆活性剂后导致了焊缝晶粒略微粗化。

Active low power laser welding of H13 hot-work die steel

It takes too long time to repair failed mold with the traditional welding processes because the heat input is dispersed and the property of the heat affected zone is easily deteriorated. The laser welding was used to repair failed mold, which has the advantages of high degree of automation, short work time and concentrated heat input. But the cost of the equipment increases dramatically as the power increases. It can effectively reduce costs that active laser welding technology is applied to mold repairing because weld seam can get a higher depth of weld in low power. The effects of active laser welding on the microstructure and weld appearance at low power were studied by using H13 hot die steel as the experimental subject. The results show that the weld appearance of with the addition of active flux is better, the color of weld is bright and the scaly figure is clear. The active laser welding makes weld width increased by 8%, and weld penetration increased by 66%. No matter coated active flux or not, there are no cracks, porosity, inclusions or other defects in the welds. However, active laser welding can increase the size of the grain in the welds.