常规工艺大都采用奥氏体、铁素体不锈钢焊丝焊接来避免出现焊接裂纹等缺陷,然而采用这类焊丝焊接的接头抗拉强度和硬度会大幅降低,使得车辆的防护性能也随之降低甚至失效.为了使超高强钢焊接接头的强度和硬度达到较高的使用要求,针对超高强钢(抗拉强度1500 MPa以上)的焊接性及焊接工艺进行了研究.通过理论分析,选取了与母材组织匹配的超低碳马氏体不锈钢焊材,制定了与之匹配的工艺方法及参数,使得焊接后接头与母材组织均为马氏体组织,且有效消除了焊接裂纹等缺陷,从而实现了焊接接头抗拉强度达到母材抗拉强度的70%以上,硬度与母材硬度相当的目标.在试验过程中,采用最经济的MAG焊焊接方法和较容易控制的预热温度,较为经济地满足了工业化生产应用.
Generally,austenite and ferrite stainless steel wire welding is used to avoid welding defects such as cracks.However,the tensile strength and hardness of the welded joint could be greatly reduced,which makes the protective performance of the vehicle was reduced,even failure.In order to get the right operating requirement, the weldability and welding technology of ultra high strength steel (tensile strength above 1500 MPa)were stud-ied.According to theoretical analysis,ultra low carbon martensitic stainless steel matching with the base material structure was selected,and technical method and parameters were established.The microstructures of the welded joint and the base metal are martensite.Any welding defects were found.The tensile strength of the welded joint increased to 70% of the base metal and the hardness is equal to the base metal.In the course of the experiment, the most economical method of MAG welding and the preheat temperature which is easier to control are adopted. Therefore,the technology is much more economical to reach the application of industrial production.
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