钴镍烧结合金与碳钢的CO_2激光焊接的可焊性

CO_2 Laser Weldability between Co+ Ni Sintered Alloy and Carbon Steel

采用 ＣＯ２激光器对 Ｃｏ＋ Ｎｉ烧结体和碳钢两种不同材料的可焊性进行了研究。采用不同功率和运转速度参数对两种材料进行了ＣＯ２激光对接焊。为研究其可焊性进行十力学测试（抗弯强度测试，显微硬度测试）和金相分析（显微结构，相转变和破坏模式）。明显地影响抗育强度的参数是气孔，输入能量的大小和焊接金属的重叠性能。为达到足够有效的强度，能量输入（线能量）必须大于 ０．３ｋＪ／ｍ，深宽比大于 ０．９，焊接金属中的气孔率应小于 ２０％。本文中展示了每部分的显微组织结构，基体部分为回火马氏体，热影响区为马氏体，焊缝金属部分则由奥氏体与变晶片状马氏体混合构成。

The weldability of different sintered materials which consists of Co + Ni and carbon steel has been investigated using CO2 laser. Autogeneous CO2 laser welding were run along the butt between two materials using sets of parameters power and travel speed. In order to study weldability, mechanical tests (bending strength test, microhardness test) and metallogical analyses (microstructure, phase transformation, fracture mode) were carried out. The parameters that deeply effect on the bending strength were porosity, energy input and the overlapping of weld metal- To have a sound strength, energy input should have over 0 .3kJ/m, aspect ratio should be over 0 .9, and porosity should be less than 20 per cent in a weld metal. The microstructure of each parts was shown like this that shank was consisted of tempered mertensite, HAZ shown as martensite, and weld metal had mixed microstructures which were made of austenite and twinned plate martensite.