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采用1 kW Nd∶YAG激光器焊接2 mm厚H62黄铜和20#钢管材.聚焦激光作用在接头黄铜一侧形成深熔焊接熔池,熔化的黄铜浸润碳钢界面形成接头.因此,在焊缝的黄铜一侧为深熔焊,碳钢一侧为钎焊,这一方法称为激光深熔钎焊(LPB).采用光学显微镜、扫描电镜(SEM)和X射线能谱分析(EDS)对焊缝成形和接头界面进行观察,发现黄铜母材与焊缝界面是正常的激光深熔焊特征,同时碳钢母材与焊缝的界面形成了良好的冶金结合,相互作用区的宽度约为3μm.显微硬度结果表明焊缝硬度值高于黄铜母材.经爆破实验测试,断裂发生在黄铜一侧,表明H62黄铜-20#钢激光深熔钎焊接头力学性能满足工业使用要求.
A 1 kW Nd: YAG laser was used to weld 2 mm thick H62 and 20 # pipes.The focused laser formed a deep melting weld pool on the brass side of the joint, forming a joint at the interface of the molten brass infiltrated carbon steel.Therefore, The brass side of the weld is deep-welded and the brazed side of the carbon steel is called laser deep-melt brazing (LPB). The microstructure of the weld was studied by optical microscope, scanning electron microscope (SEM) and X-ray energy spectrum analysis EDS) observed the formation of the weld and the interface of the joint. It was found that the interface between the base metal and the weld was the normal characteristic of laser deep fusion welding. At the same time, the interface between the base metal and the weld formed a good metallurgical bond and interaction zone The width of about 3μm.The microhardness results show that the weld hardness value higher than the brass base metal.By the blasting test, the fracture occurred in the brass side, indicating that the H62 brass 20 # steel laser deep-melt brazing joint mechanics Performance to meet industrial requirements.